source: trunk/src/org/expeditee/gui/Frame.java@ 1413

/**
 *    Frame.java
 *    Copyright (C) 2010 New Zealand Digital Library, http://expeditee.org
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.expeditee.gui;

import java.io.File;
import java.sql.Time;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Stack;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.expeditee.actions.Simple;
import org.expeditee.core.Colour;
import org.expeditee.core.Image;
import org.expeditee.core.bounds.PolygonBounds;
import org.expeditee.encryption.items.EncryptionPermissionTriple;
import org.expeditee.gio.EcosystemManager;
import org.expeditee.gio.gesture.Gesture;
import org.expeditee.gio.gesture.Gesture.GestureType;
import org.expeditee.gio.gesture.StandardGestureActions;
import org.expeditee.gio.gesture.StandardGestureActions.StandardGestureType;
import org.expeditee.gio.gesture.data.RefreshGestureData;
import org.expeditee.gio.input.KBMInputEvent.Key;
import org.expeditee.gio.input.StandardInputEventListeners;
import org.expeditee.io.Conversion;
import org.expeditee.io.ExpReader;
import org.expeditee.items.Constraint;
import org.expeditee.items.Dot;
import org.expeditee.items.Item;
import org.expeditee.items.Item.HighlightMode;
import org.expeditee.items.ItemAppearence;
import org.expeditee.items.ItemParentStateChangedEvent;
import org.expeditee.items.ItemUtils;
import org.expeditee.items.Line;
import org.expeditee.items.PermissionTriple;
import org.expeditee.items.Text;
import org.expeditee.items.UserAppliedPermission;
import org.expeditee.items.XRayable;
import org.expeditee.items.widgets.Widget;
import org.expeditee.items.widgets.WidgetCorner;
import org.expeditee.settings.UserSettings;
import org.expeditee.settings.templates.TemplateSettings;
import org.expeditee.simple.UnitTestFailedException;
import org.expeditee.stats.Formatter;
import org.expeditee.stats.SessionStats;

/**
 * Represents a Expeditee Frame that is displayed on the screen. Also is a
 * registered MouseListener on the Browser, and processes any MouseEvents
 * directly.
 * 
 * @author jdm18
 * 
 */
public class Frame /*implements Cloneable*/ {
        
        /** The frame number to indicate this is a virtual frame. */
        public static final int VIRTUAL_FRAME_NUMBER = -1;
        
        /** The background colour the frame name should take if the frame has user permission level 'none'. */
        public static final Colour FRAME_NAME_BACKGROUND_COLOUR_FOR_PERMISSION_NONE = Colour.FromRGB255(255, 220, 220);
        /** The background colour the frame name should take if the frame has user permission level 'followLinks'. */
        public static final Colour FRAME_NAME_BACKGROUND_COLOUR_FOR_PERMISSION_FOLLOW_LINKS = Colour.FromRGB255(255, 230, 135);
        /** The background colour the frame name should take if the frame has user permission level 'copy'. */
        public static final Colour FRAME_NAME_BACKGROUND_COLOUR_FOR_PERMISSION_COPY = Colour.FromRGB255(255, 255, 155);
        /** The background colour the frame name should take if the frame has user permission level 'createFrames'. */
        public static final Colour FRAME_NAME_BACKGROUND_COLOUR_FOR_PERMISSION_CREATE_FRAMES = Colour.FromRGB255(220, 255, 220);
        /** The background colour the frame name should take if the frame has user permission level 'full'. */
        public static final Colour FRAME_NAME_BACKGROUND_COLOUR_FOR_PERMISSION_FULL = null;

        private boolean _protectionChanged = false;

        // The various attributes of this Frame
        private String _frameset = null;

        private int _number = -1;

        private int _version = 0;

        private PermissionTriple _permissionTriple = null;
        
        private EncryptionPermissionTriple _encPermissionTriple = null;

        private String _owner = null;

        private String _creationDate = null;

        private String _modifiedUser = null;

        private String _modifiedDate = null;
        private long _modifiedDatePrecise;

        private String _frozenDate = null;

        // Background color is clear
        private Colour _background = null;

        // Foreground color is automatic by default
        private Colour _foreground = null;

        private String path;

        private boolean _isLocal = true;

        private boolean _sorted = true;
        
        /** Whether the frame has changed and therefore needs saving. */
        private boolean _change = false;

        /** Whether the frame has been saved. */
        private boolean _saved = false;
        
        // list of deleted items that can be restored
        private Stack<History> _undo = new Stack<History>();
        private Stack<History> _redo = new Stack<History>();

        private List<Item> _body = new ArrayList<Item>();
        private List<Item> _bodyHiddenDueToPermissions = new ArrayList<Item>();

        // for drawing purposes
        private List<Widget> _iWidgets = new ArrayList<Widget>();
        
        // frame data
        private List<String> _frameData = null;

        private int _lineCount = 0;

        private int _itemCount = 1;

        // The frameName to display on the screen
        private Text _frameName = null;

        private Map<Overlay, Frame> _overlays = new HashMap<Overlay, Frame>();

        private List<Vector> _vectors = new ArrayList<Vector>();

        private Image _buffer = null;

        private boolean _validBuffer = true;

        private Time _activeTime = new Time(0);

        private Time _darkTime = new Time(0);

        private Collection<Item> _interactableItems = new LinkedHashSet<Item>();

        private Collection<Item> _overlayItems = new LinkedHashSet<Item>();

        private Collection<Item> _vectorItems = new LinkedHashSet<Item>();

        private Text _dotTemplate = TemplateSettings.DotTemplate.get().copy();

        private Map<String, Text> _annotations = null;

        private Collection<FrameObserver> _observers = new HashSet<FrameObserver>();

        private String _encryptionLabel;
        
        private String _groupFrameName;
        private Frame _groupFrame = null;

        /** Default constructor, nothing is set. */
        public Frame() {
        }
        
//      public Frame clone() {
//              Frame clone = new Frame();
//              for (Item i: this._body) { 
//                      Item copy = i.copy();
//                      copy.setID(i.getID());  
//                      clone._body.add(copy);
//              }
//              for(Item i: this._bodyHiddenDueToPermissions) { 
//                      Item copy = i.copy();
//                      copy.setID(i.getID());
//                      clone._bodyHiddenDueToPermissions.add(i);
//              }
//              if (this._frameName != null) {
//                      clone._frameName = this._frameName.copy();
//              }
//              for(Overlay key: this._overlays.keySet()) {
//                      clone._overlays.put(key, this._overlays.get(key));
//              }
//              for(Vector v: this._vectors) {
//                      clone._vectors.add(v);
//              }
//              for (Item i: this._interactableItems) {
//                      clone._interactableItems.add(i.copy());
//              }
//              for (Item i: this._overlayItems) {
//                      clone._overlayItems.add(i.copy());
//              }
//              for (Item i: this._vectorItems) {
//                      clone._vectorItems.add(i.copy());
//              }
//              clone._frameData = this._frameData;
//              clone._frameset = this._frameset;
//              clone._number = this._number;
//              clone._version = this._version;
//              clone._permissionTriple = this._permissionTriple;
//              clone._owner = this._owner;
//              clone._creationDate = this._creationDate;
//              clone._modifiedUser = this._modifiedUser;
//              clone._modifiedDate = this._modifiedDate;
//              clone._modifiedDatePrecise = this._modifiedDatePrecise;
//              clone._frozenDate = this._frozenDate;
//              clone._background = this._background;
//              clone._foreground = this._foreground;
//              clone.path = this.path;
//              clone._isLocal = this._isLocal;
//              clone._sorted = this._sorted;
//              clone._change = this._change;
//              clone._saved = this._saved;
//              clone._lineCount = this._lineCount;
//              clone._itemCount = this._itemCount;
//              clone._buffer = this._buffer;
//              clone._validBuffer = this._validBuffer;
//              clone._activeTime = (Time) this._activeTime.clone();
//              clone._darkTime = (Time) this._darkTime.clone();
//              clone._dotTemplate = this._dotTemplate.copy();
//              
//              return clone;
//      }

        public boolean isReadOnly()
        {
                return !_frameName.hasPermission(UserAppliedPermission.full) && !_protectionChanged;
        }

        public void reset()
        {
                refreshItemPermissions(UserAppliedPermission.full);
                resetDot();
                SessionStats.NewFrameSession();
        }

        private void resetDot()
        {
            _dotTemplate.setColor(TemplateSettings.ColorWheel.getSafe(1));
            _dotTemplate.setFillColor(TemplateSettings.FillColorWheel.getSafe(0));
        }

        public void nextDot()
        {
                _dotTemplate.setFillColor(ColorUtils.getNextColor(_dotTemplate.getFillColor(), TemplateSettings.FillColorWheel.get(), null));
                _dotTemplate.setColor(ColorUtils.getNextColor(_dotTemplate.getColor(), TemplateSettings.ColorWheel.get(), null));
                if (_dotTemplate.getColor() == null || _dotTemplate.getColor().equals(Colour.WHITE)) {
                        resetDot();
                }
        }

        public Image getBuffer()
        {
                return _buffer;
        }

        public void setBuffer(Image newBuffer)
        {
                _buffer = newBuffer;
        }

        public boolean isBufferValid()
        {
                if (_buffer == null) {
                        return false;
                }

                return _validBuffer;
        }
        
        private void setBufferValid(boolean newValue)
        {
                _validBuffer = newValue;
        }

        public int getNextItemID()
        {
                return ++_itemCount;
        }

        public void updateIDs(List<Item> items)
        {
                for (Item i : items) {
                        if (!(i instanceof Line)) {
                                i.setID(getNextItemID());
                        } else {
                                i.setID(++_lineCount);
                        }
                }
        }

        /**
         * 
         * @return The interactive widgets that are currently anchored in this frame.
         *         Hence it excludes free-widgets. Returns a copy
         */
        public List<Widget> getInteractiveWidgets()
        {
                LinkedList<Widget> clone = new LinkedList<Widget>();
                clone.addAll(this._iWidgets);
                return clone;
        }

        /**
         * Returns whether this Frame has been changed and required saving to disk.
         * 
         * @return True if this Frame has been altered, false otherwise.
         */
        public boolean hasChanged()
        {
                // virtual frames are never saved
                if (_number == VIRTUAL_FRAME_NUMBER) {
                        return false;
                }

                return _change;
        }

        /**
         * Sets whether this Frame should be saved to disk.
         * 
         * @param value
         *            True if this Frame should be saved to disk, False otherwise.
         */
        public void setChanged(boolean value)
        {
                if (_change == value) {
                        return;
                }

                _change = value;

                if (_change) {
                        setBufferValid(false);
                        _saved = false;
                }
        }

        /**
         * Notify items observing the data on this frame that the frame content has
         * changed.
         * 
         * @param recalculate
         *            true if the frame should be recalculated first.
         */
        public void notifyObservers(boolean bRecalculate) {
                if (bRecalculate) {
                        recalculate();
                }
                // Notify the frame listeners that the frame has changed
                /*
                 * Avoid ConcurrentMod Exceptions when user anchors an item onto this
                 * frame which is observing this frame, by NOT using foreach loop.
                 * Calling update on a dataFrameWidget resets its subjects hence
                 * changing this frames observer list.
                 */
                Collection<FrameObserver> observersCopy = new LinkedList<FrameObserver>(_observers);
                // System.out.println(++updateCount + " update");

                for (FrameObserver fl : observersCopy) {
                        if (fl.isVisible()) {
                                fl.update();
                        }
                }
        }

        // indicates the frame has changed
        public void change()
        {
                setChanged(true);
                _interactableItems.clear();
        }

        /**
         * Returns an ArrayList of all Items currently on the Frame (excludes Items
         * attached to the cursor).
         * 
         * @return The list of Item objects that are on this Frame.
         */
        public List<Item> getItems(boolean visible)
        {
                if (!_sorted) {
                        for(int i = 0; i < _body.size();) {
                                if(_body.get(i) == null) {
                                        _body.remove(i);
                                } else {
                                        i++;
                                }
                        }
                        Collections.sort(_body);
                        _sorted = true;
                }

                List<Item> items = new ArrayList<Item>();

                for (Item i : _body) {
                        if (i == null) {
                                continue;
                        }
                        
                        if (i.isVisible() || (!visible && !i.isDeleted())) {
                                items.add(i);
                        }
                }

                return items;
        }

        /** TODO: Comment. cts16 */
        public List<Item> getItems()
        {
                return getItems(false);
        }

        /**
         * @param i
         *            Item to check if contained in this frame
         * @return True if this frame contains i.
         */
        public boolean containsItem(Item i)
        {
                if (i == null) {
                        throw new NullPointerException("i");
                }
                
                return _body.contains(i);
        }

        /**
         * Returns a list of all the non annotation text items on the frame which
         * are not the title or frame name or special annotation items.
         * 
         * @param includeAnnotations
         *            true if annotation items without special meaning should be
         *            included
         * @param includeLineEnds
         *            true if text on the end of lines should be included in the
         *            list
         * @return the list of body text items.
         */
        public List<Text> getBodyTextItems(boolean includeAnnotations)
        {
                List<Text> bodyTextItems = new ArrayList<Text>();
                
                for (Item i : getItems(true)) {
                        // only add up normal body text items
                        if ((i instanceof Text) && ((includeAnnotations && !((Text) i).isSpecialAnnotation()) || !i.isAnnotation()) && !i.isLineEnd()) {
                                bodyTextItems.add((Text) i);
                        }
                }
                
                bodyTextItems.remove(getTitleItem());

                return bodyTextItems;
        }

        public Collection<Item> getNonAnnotationItems(boolean removeTitle)
        {
                Collection<Item> items = new ArrayList<Item>();
                for (Item i : getItems(true)) {
                        // only add up normal body text items
                        if (!i.isAnnotation()) {
                                items.add(i);
                        }
                }
                
                if (removeTitle) {
                        items.remove(getTitleItem());
                }
                
                return items;
        }

        /**
         * Gets the last item on the frame that is a non annotation item but is also
         * text.
         * 
         * @return the last non annotation text item.
         */
        public Item getLastNonAnnotationTextItem()
        {
                List<Item> items = getItems();

                // find the last non-annotation text item
                for (int i = (items.size() - 1); i >= 0; i--) {
                        Item it = items.get(i);

                        if (it instanceof Text && !it.isAnnotation()) {
                                return it;
                        }
                }
                return null;
        }

        /**
         * Iterates through the list of items on the frame, and returns one with the
         * given id if one exists, otherwise returns null.
         * 
         * @param id
         *            The id to search for in the list of items
         * @return The item on this frame with the given ID, or null if one is not
         *         found.
         */
        public Item getItemWithID(int id)
        {
                for (Item i : _body) {
                        if (i.getID() == id) {
                                return i;
                        }
                }
                return null;
        }

        /**
         * Sets this Frame's Title which is displayed in the top left corner.
         * 
         * @param title
         *            The title to assign to this Frame
         */
        public void setTitle(String title)
        {
                if (title == null || title.equals("")) {
                        return;
                }

                boolean oldchange = _change;

                // remove any numbering this title has
                title = title.replaceAll("^\\d*[.] *", "");
                Text frameTitle = getTitleItem();

                if (frameTitle == null) {
                        if (TemplateSettings.TitleTemplate.get() == null) {
                                frameTitle = new Text(getNextItemID(), title);
                        } else {
                                frameTitle = TemplateSettings.TitleTemplate.get().copy();
                                frameTitle.setID(this.getNextItemID());
                                frameTitle.setText(title);
                        }
                        /*
                         * Need to set the parent otherwise an exception is thrown when
                         * new profile is created
                         */
                        frameTitle.setParent(this);
                        frameTitle.resetTitlePosition();
                        addItem(frameTitle);
                } else {
                        // If it begins with a tag remove it

                        // Remove the @ symbol if it is there
                        // title = ItemUtils.StripTagSymbol(title);
                        frameTitle.setText(title);
                        // If the @ symbol is followed by numbering or a bullet remove that too
                        String autoBulletText = StandardGestureActions.getAutoBullet(title);
                        if (autoBulletText.length() > 0) {
                                frameTitle.stripFirstWord();
                        }
                }
                // TODO Widgets... check this out
                // Brook: Cannot figure what is going on above... widget annot titles
                // should be stripped always
                if (ItemUtils.startsWithTag(frameTitle, ItemUtils.GetTag(ItemUtils.TAG_IWIDGET))) {
                        frameTitle.stripFirstWord();
                }

                FrameUtils.Parse(this);

                // do not save if this is the only change
                setChanged(oldchange);
        }

        public Text getTitleItem()
        {
                List<Item> items = getVisibleItems();
                
                for (Item i : items) {
                        if (i instanceof Text && i.getX() < UserSettings.TitlePosition.get() && i.getY() < UserSettings.TitlePosition.get()) {
                                return (Text) i;
                        }
                }

                return null;
        }

        public String getTitle()
        {
                Text title = getTitleItem();
                if (title == null) {
                        return getName();
                }

                return title.getFirstLine();
        }

        public Item getNameItem() {
                //Text ret = _frameName;
                if (this.getEncryptionLabel() != null && this.getEncryptionLabel().length() > 0) {
                        _frameName.setText("\uD83D\uDD12" + getFramesetName() + _number);
                        _frameName.resetFrameNamePosition();
                }
                return _frameName;
        }

        public Text getItemTemplate()
        {
                return getTemplate(TemplateSettings.ItemTemplate.get(), ItemUtils.TAG_ITEM_TEMPLATE);
        }

        public Text getAnnotationTemplate()
        {
                Text t = getTemplate(TemplateSettings.AnnotationTemplate.get(), ItemUtils.TAG_ANNOTATION_TEMPLATE);

                if (t == null) {
                        t = getItemTemplate();
                }

                return t;
        }

        public Text getStatTemplate()
        {
                SessionStats.CreatedText();
                Text t = getTemplate(TemplateSettings.StatTemplate.get(), ItemUtils.TAG_STAT_TEMPLATE);

                if (t == null) {
                        t = getItemTemplate();
                }

                return t;
        }
        
        public Item getTooltipTextItem(String tooltipText)
        {
                return getTextItem(tooltipText, TemplateSettings.TooltipTemplate.get().copy());
        }

        public Item getStatsTextItem(String itemText)
        {
                return getTextItem(itemText, getStatTemplate());
        }

        public Item getTextItem(String itemText)
        {
                return getTextItem(itemText, getItemTemplate());
        }

        private Item getTextItem(String itemText, Text template)
        {
                Text t = template;
                // We dont want the stats to wrap at all
                // t.setMaxWidth(Integer.MAX_VALUE);
                t.setPosition(DisplayController.getMousePosition());
                // The next line is needed to make sure the item is removed from the
                // frame when picked up
                t.setParent(this);
                t.setText(itemText);
                return t;
        }

        public Text getCodeCommentTemplate()
        {
                Text t = getTemplate(TemplateSettings.CommentTemplate.get(), ItemUtils.TAG_CODE_COMMENT_TEMPLATE);

                if (t == null) {
                        t = getItemTemplate();
                }

                return t;
        }
        

        /**
         * Returns any items on this frame that are within the given Shape. Also
         * returns any Items on overlay frames that are within the Shape.
         * 
         * @param shape
         *            The Shape to search for Items in
         * @return All Items on this Frame or overlayed Frames for which
         *         Item.intersects(shape) return true.
         */
        public Collection<Item> getItemsWithin(PolygonBounds poly)
        {
                Collection<Item> results = new LinkedHashSet<Item>();
                for (Item i : getVisibleItems()) {
                        if (i.intersects(poly)) {
                                if (i instanceof XRayable) {
                                        results.addAll(i.getConnected());
                                        // Dont add circle centers
                                        // TODO change this to be isCircle center
                                } else if (!i.hasEnclosures()) {
                                        results.add(i);
                                }
                        }
                }

                for (Overlay o : _overlays.keySet()) {
                        results.addAll(o.Frame.getItemsWithin(poly));
                }
                
                for (Item i : getVectorItems()) {
                        if (i.intersects(poly)) {
                                // This assumes a results is a set
                                results.add(i.getEditTarget());
                        }
                }

                return results;
        }

        /**
         * Sets the name of this Frame to the given String, to be displayed in the
         * upper right corner.
         * 
         * @param name
         *            The name to use for this Frame.
         */
        public void setFrameset(String name)
        {
                _frameset = name;
        }

        public void setName(String framename)
        {
                int num = Conversion.getFrameNumber(framename);
                String frameset = Conversion.getFramesetName(framename, false);

                setName(frameset, num);
        }

        /**
         * Sets the frame number of this Frame to the given integer
         * 
         * @param number
         *            The number to set as the frame number
         */
        public void setFrameNumber(int number)
        {
                assert (number >= 0);

                if (_number == number) {
                        return;
                }

                _number = number;
                boolean oldchange = _change;

                int id;

                if (_frameName != null) {
                        id = _frameName.getID();
                } else {
                        id = -1 * getNextItemID();
                }
                
                _frameName = new Text(id);
                _frameName.setParent(this);
                _frameName.setText(getFramesetName() + _number);
                _frameName.resetFrameNamePosition();
                setChanged(oldchange);
        }

        /**
         * Returns the number of this Frame.
         * 
         * @return The Frame number of this Frame or -1 if it is not set.
         */
        public int getNumber()
        {
                return _number;
        }

        /**
         * Increments the version of this Frame to the given String.
         * 
         * @param version
         *            The version to use for this Frame.
         */
        public void setVersion(int version)
        {
                _version = version;
        }

        /**
         * Sets the protection of this Frame to the given String.
         * 
         * @param protection
         *            The protection to use for this Frame.
         */
        public void setPermission(PermissionTriple permission) {
                List<String> groupMembers = getGroupMembers();
                
                if (_permissionTriple != null && !_permissionTriple.getPermission(this._owner, groupMembers).equals(permission.getPermission(this._owner, groupMembers))) {
                        _protectionChanged = true;
                }

                _permissionTriple = new PermissionTriple(permission);

                if (_body.size() > 0) {
                        refreshItemPermissions(permission.getPermission(_owner, groupMembers));
                }
        }

        /**
         * Sets the owner of this Frame to the given String.
         * 
         * @param owner
         *            The owner to use for this Frame.
         */
        public void setOwner(String owner)
        {
                _owner = owner;
        }

        /**
         * Sets the created date of this Frame to the given String.
         * 
         * @param date
         *            The date to use for this Frame.
         */
        public void setDateCreated(String date)
        {
                _creationDate = date;
                _modifiedDate = date;
                for (Item i : _body) {
                        i.setDateCreated(date);
                }
        }

        /**
         * Resets the dates and version numbers for newly created frames.
         * 
         */
        public void resetDateCreated()
        {
                setDateCreated(Formatter.getDateTime());
                resetTimes();
                setVersion(0);
        }

        private void resetTimes()
        {
                setActiveTime(new Time(0));
                setDarkTime(new Time(0));
        }

        /**
         * Sets the last modifying user of this Frame to the given String.
         * 
         * @param user
         *            The user to set as the last modifying user.
         */
        public void setLastModifyUser(String user)
        {
                _modifiedUser = user;
        }

        /**
         * Sets the last modified date of this Frame to the given String.
         * 
         * @param date
         *            The date to set as the last modified date.
         * @param precise The millisecond precision last modified date.
         */
        public void setLastModifyDate(String date, long precise) {
                _modifiedDate = date;
                _modifiedDatePrecise = precise;
        }
        
        /**
         * Sets the last modified date of this Frame to the given String.
         * Used during startup.  If able to be more precise then use the overloaded function.
         * 
         * @param date
         *            The date to set as the last modified date.
         */
        public void setLastModifyDate(String date) {
                _modifiedDate = date;
                _modifiedDatePrecise = -1l;
        }

        /**
         * Sets the last frozen date of this Frame to the given String.
         * 
         * @param date
         *            The date to set as the last frozen date.
         */
        public void setFrozenDate(String date)  {
                _frozenDate = date;
        }

        public void setResort(boolean value)
        {
                _sorted = !value;
        }

        /**
         * Adds the given Item to the body of this Frame.
         * 
         * @param item
         *            The Item to add to this Frame.
         */
        public void addItem(Item item)
        {
                addItem(item, true);
        }

        public void addItem(Item item, boolean recalculate)
        {
                if (item == null || item.equals(_frameName) || _body.contains(item)) {
                        return;
                }

                // When an annotation item is anchored the annotation list must be
                // refreshed
                if (item.isAnnotation()) {
                        clearAnnotations();
                }

                if (item instanceof Line) {
                        _lineCount++;
                }

                _itemCount = Math.max(_itemCount, item.getID());

                _body.add(item);
                item.setParent(this);
                item.setFloating(false); // esnure that it is anchored

                item.invalidateCommonTrait(ItemAppearence.Added);

                // If the item is a line end and has constraints with items already
                // on the frame then make sure the constraints hold
                if (item.isLineEnd()) {
                        item.setPosition(item.getPosition());
                }

                _sorted = false;

                // item.setMaxWidth(FrameGraphics.getMaxFrameSize().width);
                // add widget items to the list of widgets
                if (item instanceof WidgetCorner) {
                        Widget iw = ((WidgetCorner) item).getWidgetSource();
                        if (!this._iWidgets.contains(iw)) { // A set would have been
                                if (StandardInputEventListeners.kbmStateListener.isKeyDown(Key.CTRL)) {
                                        _iWidgets.add(iw);
                                } else {
                                        _iWidgets.add(0, iw);
                                }
                        }
                }

                item.onParentStateChanged(new ItemParentStateChangedEvent(this, ItemParentStateChangedEvent.EVENT_TYPE_ADDED));

                // if (recalculate && item.recalculateWhenChanged())
                // recalculate();

                change();
        }

        public void refreshSize()
        {
                boolean bReparse = false;
                
                for (Item i : getItems()) {
                        Integer anchorLeft   = i.getAnchorLeft();
                        Integer anchorRight  = i.getAnchorRight();
                        Integer anchorTop    = i.getAnchorTop();
                        Integer anchorBottom = i.getAnchorBottom();
        
                        
                        if (anchorLeft != null) {
                                i.setAnchorLeft(anchorLeft);
                                if (i.hasVector()) {
                                        bReparse = true;
                                }
                        }
                        
                        if (anchorRight != null) {
                                i.setAnchorRight(anchorRight);
                                if (i.hasVector()) {
                                        bReparse = true;
                                }
                        }
                        
                        if (anchorTop != null) {
                                i.setAnchorTop(anchorTop);
                                if (i.hasVector()) {
                                        bReparse = true;
                                }
                        }
                        
                        if (anchorBottom != null) {
                                i.setAnchorBottom(anchorBottom);
                                if (i.hasVector()) {
                                        bReparse = true;
                                }
                        }
                }

                // Do the anchors on the overlays
                for (Overlay o : getOverlays()) {
                        o.Frame.refreshSize();
                }

                if (bReparse) {
                        FrameUtils.Parse(this, false);
                }

                _frameName.resetFrameNamePosition();
        }

        public void addAllItems(Collection<Item> toAdd)
        {
                for (Item i : toAdd) {
                        // If an annotation is being deleted clear the annotation list
                        if (i.isAnnotation()) {
                                i.getParentOrCurrentFrame().clearAnnotations();
                        }
                        // TODO Improve efficiency when addAll is called
                        addItem(i);
                }
        }

        public void removeAllItems(Collection<Item> toRemove)
        {
                for (Item i : toRemove) {
                        // If an annotation is being deleted clear the annotation list
                        if (i.isAnnotation()) {
                                i.getParentOrCurrentFrame().clearAnnotations();
                        }
                        removeItem(i);
                }
        }

        public void removeItem(Item item) {
                removeItem(item, true);
        }

        public void removeItem(Item item, boolean recalculate)
        {
                // If an annotation is being deleted clear the annotation list
                if (item.isAnnotation()) {
                        item.getParentOrCurrentFrame().clearAnnotations();
                }

                if (_body.remove(item)) {
                        change();
                        // Remove widgets from the widget list
                        if (item != null) {
                                item.onParentStateChanged(new ItemParentStateChangedEvent(this, ItemParentStateChangedEvent.EVENT_TYPE_REMOVED));
                                
                                if (item instanceof WidgetCorner) {
                                        _iWidgets.remove(((WidgetCorner) item).getWidgetSource());
                                }
                                
                                item.invalidateCommonTrait(ItemAppearence.Removed);
                        }
                        // TODO Improve efficiency when removeAll is called
                        // if (recalculate && item.recalculateWhenChanged())
                        // recalculate();
                }
        }

        /**
         * Adds the given History event to the stack.
         * 
         * @param stack The stack to add to
         * @param items The items to put in the event
         * @param type  The type of event that occurred
         */
        private void addToUndo(Collection<Item> items, History.Type type)
        {
                if (items.size() < 1) {
                        return;
                }

                _undo.push(new History(items, type));
        }
        
        public void addToUndoDelete(Collection<Item> items)
        {
                addToUndo(items, History.Type.deletion);
        }
        
        public void addToUndoMove(Collection<Item> items)
        {
                addToUndo(items, History.Type.movement);
        }

        public void undo()
        {
                boolean bReparse = false;
                boolean bRecalculate = false;

                if (_undo.size() <= 0) {
                        return;
                }

                History undo = _undo.pop();
                
                // System.out.println("Undoing: " + undo);

                switch(undo.type) {
                case deletion:
                        _redo.push(undo);
                for(Item i : undo.items) {
                        _body.add(i);
                                bReparse |= i.hasOverlay();
                                bRecalculate |= i.recalculateWhenChanged();
                                if (i instanceof Line) {
                                        Line line = (Line) i;
                                        line.getStartItem().addLine(line);
                                        line.getEndItem().addLine(line);
                                } else {
                                        i.setOffset(0, 0);
                                }
                }
                break;
                case movement:
                        List<Item> changed = new LinkedList<Item>(_body);
                        changed.retainAll(undo.items);
                        _redo.push(new History(changed, History.Type.movement));
                        for(Item i : undo.items) {
                                int index;
                                if(i.isVisible() && (index = _body.indexOf(i)) != -1) {
                                        _body.set(index, i);
                                }
                }
                        break;
                }
                
                change();
                
                StandardGestureActions.refreshHighlights();
                
                if (bReparse) {
                        FrameUtils.Parse(this, false, false);
                } else {
                        notifyObservers(bRecalculate);
                }
                
                // always request a refresh otherwise filled shapes
                // that were broken by a deletion and then reconnected by the undo
                // don't get filled until the user otherwise causes them to redraw
                DisplayController.requestRefresh(false);
                // ItemUtils.EnclosedCheck(_body);
                ItemUtils.Justify(this);
        }
        
        public void redo()
        {
                boolean bReparse = false;
                boolean bRecalculate = false;

                if (_redo.size() <= 0) {
                        return;
                }

                History redo = _redo.pop();
                
                // System.out.println("Redoing: " + redo);

                switch(redo.type) {
                case deletion:
                        _undo.push(redo);
                for(Item i : redo.items) {
                        _body.remove(i);
                                bReparse |= i.hasOverlay();
                                bRecalculate |= i.recalculateWhenChanged();
                                if (i instanceof Line) {
                                        Line line = (Line) i;
                                        line.getStartItem().removeLine(line);
                                        line.getEndItem().removeLine(line);
                                } else {
                                        i.setOffset(0, 0);
                                }
                }
                break;
                case movement:
                        List<Item> changed = new LinkedList<Item>(_body);
                        changed.retainAll(redo.items);
                        _undo.push(new History(changed, History.Type.movement));
                        for(Item i : redo.items) {
                                int index;
                                if(i.isVisible() && (index = _body.indexOf(i)) != -1) {
                                        _body.set(index, i);
                                }
                }
                        break;
                }
                
                change();
                
                StandardGestureActions.refreshHighlights();
                
                if (bReparse) {
                        FrameUtils.Parse(this, false, false);
                } else {
                        notifyObservers(bRecalculate);
                }
                
                // always request a refresh otherwise filled shapes
                // that were broken by a deletion and then reconnected by the undo
                // don't get filled until the user otherwise causes them to redraw
                DisplayController.requestRefresh(false);
                // ItemUtils.EnclosedCheck(_body);
                ItemUtils.Justify(this);
        }

        /**
         * Returns the frameset of this Frame
         * 
         * @return The name of this Frame's frameset.
         */
        public String getFramesetName()
        {
                return _frameset;
        }

        public String getName()
        {
                return getFramesetName() + _number;
        }

        /**
         * Returns the format version of this Frame
         * 
         * @return The version of this Frame.
         */
        public int getVersion()
        {
                return _version;
        }

        public PermissionTriple getPermission() {
                return _permissionTriple;
        }
        
        public UserAppliedPermission getUserAppliedPermission() {
                return getUserAppliedPermission(UserAppliedPermission.full);
        }

        public UserAppliedPermission getUserAppliedPermission(UserAppliedPermission defaultPermission) {
                if (_permissionTriple == null) {
                        return defaultPermission;
                }

                return _permissionTriple.getPermission(_owner, getGroupMembers());
        }

        public String getOwner()
        {
                return _owner;
        }

        public String getDateCreated()
        {
                return _creationDate;
        }

        public String getLastModifyUser()
        {
                return _modifiedUser;
        }

        public String getLastModifyDate() {
                return _modifiedDate;
        }
        
        public long getLastModifyPrecise() {
                return _modifiedDatePrecise;
        }

        public String getFrozenDate()
        {
                return _frozenDate;
        }

        public void setBackgroundColor(Colour back)
        {
                _background = back;
                
                change();

                if (this == DisplayController.getCurrentFrame()) {
                        DisplayController.requestRefresh(false);
                }
        }

        public Colour getBackgroundColor()
        {
                return _background;
        }

        public Colour getPaintBackgroundColor()
        {
                // If null... return white
                if (_background == null) {
                        return Item.DEFAULT_BACKGROUND;
                }

                return _background;
        }

        public void setForegroundColor(Colour front)
        {
                _foreground = front;
                
                change();
        }

        public Colour getForegroundColor()
        {
                return _foreground;
        }

        public Colour getPaintForegroundColor()
        {
                final int GRAY = Colour.GREY.getBlue();
                final int THRESHOLD = Colour.FromComponent255(10);

                if (_foreground == null) {
                        Colour back = getPaintBackgroundColor();
                        if (Math.abs(back.getRed() - GRAY) < THRESHOLD
                                        && Math.abs(back.getBlue() - GRAY) < THRESHOLD
                                        && Math.abs(back.getGreen() - GRAY) < THRESHOLD)
                        {
                                return Colour.WHITE;
                        }
                        
                        Colour fore = back.inverse();
                        
                        return fore;
                }

                return _foreground;
        }

        @Override
        public String toString()
        {
                StringBuilder s = new StringBuilder();
                s.append(String.format("Name: %s%d%n", _frameset, _number));
                s.append(String.format("Version: %d%n", _version));
                // s.append(String.format("Permission: %s%n", _permission.toString()));
                // s.append(String.format("Owner: %s%n", _owner));
                // s.append(String.format("Date Created: %s%n", _creationDate));
                // s.append(String.format("Last Mod. User: %s%n", _modifiedUser));
                // s.append(String.format("Last Mod. Date: %s%n", _modifiedDate));
                s.append(String.format("Items: %d%n", _body.size()));
                return s.toString();
        }

        public Text getTextAbove(Text current)
        {
                Collection<Text> currentTextItems = FrameUtils.getCurrentTextItems();
                List<Text> toCheck = new ArrayList<Text>();
                
                if (currentTextItems.contains(current)) {
                        toCheck.addAll(currentTextItems);
                } else {
                        toCheck.addAll(getTextItems());
                }
                
                // Make sure the items are sorted
                Collections.sort(toCheck);

                int ind = toCheck.indexOf(current);
                if (ind == -1) {
                        return null;
                }

                // loop through all items above this one, return the first match
                for (int i = ind - 1; i >= 0; i--) {
                        Text check = toCheck.get(i);
                        if (FrameUtils.inSameColumn(check, current)) {
                                return check;
                        }
                }

                return null;
        }
        
        /**
         * Gets the text items that are in the same column and below a specified
         * item. Frame title and name are excluded from the column list.
         * 
         * @param from
         *            The Item to get the column for.
         */
        public List<Text> getColumn(Item from)
        {
                // Check that this item is on the current frame
                if (!_body.contains(from)) {
                        return null;
                }

                if (from == null) {
                        from = getLastNonAnnotationTextItem();
                }

                if (from == null) {
                        return null;
                }

                // Get the enclosedItems
                Collection<Text> enclosed = FrameUtils.getCurrentTextItems();
                List<Text> toCheck = null;
                
                if (enclosed.contains(from)) {
                        toCheck = new ArrayList<Text>();
                        toCheck.addAll(enclosed);
                } else {
                        toCheck = getBodyTextItems(true);
                }

                List<Text> column = new ArrayList<Text>();
                
                if (toCheck.size() > 0) {
                        // Make sure the items are sorted
                        Collections.sort(toCheck);

                        // Create a list of items consisting of the item 'from' and all the
                        // items below it which are also in the same column as it
                        int index = toCheck.indexOf(from);

                        // If its the title index will be 0
                        if (index < 0) {
                                index = 0;
                        }

                        for (int i = index; i < toCheck.size(); i++) {
                                Text item = toCheck.get(i);
                                if (FrameUtils.inSameColumn(from, item)) {
                                        column.add(item);
                                }
                        }
                }

                return column;
        }

        /**
         * Adds the given Vector to the list of vector Frames being drawn with this
         * Frame.
         * 
         * @param vector
         *            The Vector to add
         * 
         * @throws NullPointerException
         *             If overlay is null.
         */
        protected boolean addVector(Vector toAdd)
        {
                // make sure we dont add this frame as an overlay of itself
                if (toAdd.Frame == this) {
                        return false;
                }
                
                _vectors.add(toAdd);
                
                // Items must be notified that they have been added or removed from this
                // frame via the vector...
                int maxX = 0;
                int maxY = 0;
                
                HighlightMode mode = toAdd.Source.getHighlightMode();
                if (mode != HighlightMode.None) {
                        mode = HighlightMode.Connected;
                }
                
                Colour highlightColor = toAdd.Source.getHighlightColor();
                
                for (Item i : ItemUtils.CopyItems(toAdd.Frame.getVectorItems(), toAdd)) {
                        i.onParentStateChanged(new ItemParentStateChangedEvent(this, ItemParentStateChangedEvent.EVENT_TYPE_ADDED_VIA_OVERLAY, toAdd.permission));
                        i.setEditTarget(toAdd.Source);
                        i.setHighlightModeAndColour(mode, highlightColor);
                        _vectorItems.add(i);
                        i.invalidateAll();
                        i.invalidateFill();
                        
                        // Get the right most x and bottom most y pos
                        int itemRight = i.getX() + i.getBoundsWidth();
                        if (itemRight > maxX) {
                                maxX = itemRight;
                        }
                        
                        int itemBottom = i.getY() + i.getBoundsHeight();
                        if (itemBottom > maxY) {
                                maxY = itemBottom;
                        }
                }
                
                toAdd.setSize(maxX, maxY);
                
                return true;
        }

        public Collection<Vector> getVectors()
        {
                Collection<Vector> l = new LinkedList<Vector>();
                l.addAll(_vectors);
                return l;
        }

        public Collection<Overlay> getOverlays()
        {
                return new LinkedList<Overlay>(_overlays.keySet());
        }

        /**
         * @return All vectors seen by this frame (including its vector's vectors).
         */
        public List<Vector> getVectorsDeep()
        {
                List<Vector> l = new LinkedList<Vector>();
                getVectorsDeep(l, this, new LinkedList<Frame>());
                return l;
        }

        private boolean getVectorsDeep(List<Vector> vectors, Frame vector, List<Frame> seenVectors)
        {
                if (seenVectors.contains(vector)) {
                        return false;
                }

                seenVectors.add(vector);

                for (Vector v : vector.getVectors()) {
                        if (getVectorsDeep(vectors, v.Frame, seenVectors)) {
                                vectors.add(v);
                        }
                }

                return true;
        }

        public List<Overlay> getOverlaysDeep()
        {
                List<Overlay> ret = new LinkedList<Overlay>();
                
                getOverlaysDeep(ret, new LinkedList<Frame>());
                
                return ret;
        }
        
        private boolean getOverlaysDeep(List<Overlay> overlays, List<Frame> seenOverlays)
        {
                if (seenOverlays.contains(this)) {
                        return false;
                }
                
                seenOverlays.add(this);
                
                for (Overlay o : this.getOverlays()) {
                        if (o.Frame.getOverlaysDeep(overlays, seenOverlays)) {
                                overlays.add(o);
                        }
                }
                return true;
        }
        
        /**
         * Recursive function similar to AddAllOverlayItems.
         * 
         * @param widgets
         *            The collection the widgets will be added to
         * @param overlay
         *            An "overlay" frame - this initially will be the parent frame
         * @param seenOverlays
         *            Used for state in the recursion stack. Pass as an empty
         *            (non-null) list.
         */
        public List<Widget> getAllOverlayWidgets()
        {
                List<Widget> widgets = new LinkedList<Widget>();
                
                for (Overlay o : getOverlaysDeep()) {
                        widgets.addAll(o.Frame.getInteractiveWidgets());
                }
                
                return widgets;
        }

        /**
         * Gets the overlay on this frame which owns the given item.
         * 
         * @param item
         *            The item - must not be null.
         * @return The overlay that contains the item. Null if no overlay owns the
         *         item.
         */
        public Overlay getOverlayOwner(Item item)
        {
                if (item == null) {
                        throw new NullPointerException("item");
                }

                for (Overlay l : getOverlays()) {
                        if (item.getParent() == l.Frame) {
                                return l;
                        }
                }

                // TODO return the correct vector... not just the first vector matching
                // the vector frame
                for (Vector v : getVectors()) {
                        if (item.getParent() == v.Frame) {
                                return v;
                        }
                }

                return null;
        }

        public void clearVectors()
        {
                _vectors.clear();

                for (Item i : _vectorItems) { // TODO: Rethink where this should live
                        i.invalidateAll();
                        i.invalidateFill();
                }
                _vectorItems.clear();

        }

        protected boolean removeVector(Vector toRemove)
        {
                if (!_vectors.remove(toRemove)) {
                        return false;
                }
                
                for (Item i : toRemove.Frame.getVectorItems()) {
                        i.invalidateAll();
                        i.invalidateFill();
                        _vectorItems.remove(i);
                        i.onParentStateChanged(new ItemParentStateChangedEvent(this,
                                        ItemParentStateChangedEvent.EVENT_TYPE_REMOVED_VIA_OVERLAY,
                                        toRemove.permission));

                }
                
                return true;
        }

        public void clearOverlays()
        {
                for (Overlay o : _overlays.keySet()) {
                        for (Item i : o.Frame.getItems()) {
                                i.onParentStateChanged(new ItemParentStateChangedEvent(
                                                                this,
                                                                ItemParentStateChangedEvent.EVENT_TYPE_REMOVED_VIA_OVERLAY,
                                                                o.permission));
                        }
                }
                _overlayItems.clear();
                _overlays.clear();
                assert (_overlays.isEmpty());
        }

        protected boolean removeOverlay(Frame f)
        {
                for (Overlay o : _overlays.keySet()) {
                        if (o.Frame == f) {
                                _overlays.remove(o);
                                
                                for (Item i : f.getItems()) {
                                        _overlayItems.remove(i);
                                        i.onParentStateChanged(new ItemParentStateChangedEvent(
                                                                        this,
                                                                        ItemParentStateChangedEvent.EVENT_TYPE_REMOVED_VIA_OVERLAY,
                                                                        o.permission));
                                }
                                
                                return true;
                        }
                }
                
                return false;
        }

        public void addAllVectors(List<Vector> vectors)
        {
                for (Vector v : vectors) {
                        addVector(v);
                }
        }

        public void addAllOverlays(Collection<Overlay> overlays)
        {
                for (Overlay o : overlays) {
                        addOverlay(o);
                }
        }

        protected boolean addOverlay(Overlay toAdd)
        {
                // make sure we dont add this frame as an overlay of itself
                if (toAdd.Frame == this) {
                        return false;
                }
                
                // Dont add the overlay if there is already one for this frame
                if (_overlays.values().contains(toAdd.Frame)) {
                        return false;
                }
                
                // Add the overlay to the map of overlays on this frame
                _overlays.put(toAdd, toAdd.Frame);
                
                // Add all the overlays from the overlay frame to this frame
                // TODO: Can this cause a recursion loop? If A and B are overlays of each other? cts16
                for (Overlay o : toAdd.Frame.getOverlays()) {
                        addOverlay(o);
                }

                // Add all the vectors from the overlay frame to this frame
                for (Vector v : toAdd.Frame.getVectors()) {
                        addVector(v);
                }

                // Now add the items for this overlay
                UserAppliedPermission permission = UserAppliedPermission.min(toAdd.Frame.getUserAppliedPermission(), toAdd.permission);

                // Items must be notified that they have been added or removed from this
                // frame via the overlay...
                for (Item i : toAdd.Frame.getVisibleItems()) {
                        i.onParentStateChanged(new ItemParentStateChangedEvent(this, ItemParentStateChangedEvent.EVENT_TYPE_ADDED_VIA_OVERLAY, permission));
                        _overlayItems.add(i);
                }

                return true;
        }

        @Override
        public boolean equals(Object o)
        {
                if (o instanceof String) {
                        return (String.CASE_INSENSITIVE_ORDER.compare((String) o, getName()) == 0);
                }

                if (o instanceof Frame) {
                        return getName().equals(((Frame) o).getName());
                }

                return super.equals(o);
        }

        /**
         * Merge one frames contents into another.
         * 
         * @param toMergeWith
         */
        private void merge(Frame toMergeWith)
        {
                if (toMergeWith == null) {
                        return;
                }

                List<Item> copies = ItemUtils.CopyItems(toMergeWith.getItems());
                copies.remove(toMergeWith.getNameItem());

                for (Item i : copies) {
                        if (i.getID() >= 0) {
                                i.setID(this.getNextItemID());
                                addItem(i);
                        }
                }
        }

        /**
         * This method is for merging frames or setting frame attributes via
         * injecting a text item into the frameName item.
         * 
         * @param toMerge
         * @return the items that cant be merged
         */
        public List<Item> merge(List<Item> toMerge)
        {
                ArrayList<Item> remain = new ArrayList<Item>(0);

                for (Item i : toMerge) {
                        if (!(i instanceof Text)) {
                                remain.add(i);
                        } else {
                                if (!AttributeUtils.setAttribute(this, (Text) i)) {
                                        if (i.getLink() != null) {
                                                merge(FrameIO.LoadFrame(i.getAbsoluteLink()));
                                        } else if (FrameIO.isValidFrameName(((Text) i).getFirstLine())) {
                                                // If we get hear we are merging frames
                                                merge(FrameIO.LoadFrame(((Text) i).getFirstLine()));
                                        }
                                }
                        }
                }

                return remain;
        }

        /**
         * Removes all non-title non-annotation items from this Frame. All removed
         * items are added to the backup-stack.
         */
        public void clear(boolean keepAnnotations)
        {
                List<Item> newBody = new ArrayList<Item>(0);
                
                Item title = getTitleItem();
                
                if (title != null) {
                        newBody.add(title);
                        _body.remove(title);
                }
                
                if (keepAnnotations) {
                        for (Item i : _body) {
                                if (i.isAnnotation()) {
                                        newBody.add(i);
                                }
                        }
                }
                
                _body.removeAll(newBody);
                addToUndoDelete(_body);
                _body = newBody;
                change();

                if (!keepAnnotations && _annotations != null) {
                        _annotations.clear();
                }
        }

        /**
         * Creates a new text item with the given text.
         * 
         * @param text
         * @return
         */
        public Text createNewText(String text)
        {
                Text t = createBlankText(text);
                t.setText(text);
                return t;
        }

        /**
         * Creates a new Text Item with no text. The newly created Item is a copy
         * the ItemTemplate if one is present, and inherits all the attributes of
         * the Template
         * 
         * @return The newly created Text Item
         */
        public Text createBlankText(String templateType) {
                File file = new File(getFramePathReal());
                long fileLastModified = file.lastModified();
                long frameLastModified = this.getLastModifyPrecise();
                //if (ExpReader.getVersion(getFramePathReal()) > this._version) {
                if (fileLastModified > frameLastModified) {
                        GestureType refreshGestureType = StandardGestureActions.getInstance().gestureType(StandardGestureType.REFRESH);
                        RefreshGestureData refreshGestureData = new RefreshGestureData(true, false);
                        try {
                                StandardGestureActions.getInstance().onGesture(new Gesture(refreshGestureType, refreshGestureData));
                                EcosystemManager.getMiscManager().beep();
                        } catch (NullPointerException e) {
                                //Detected more recent data on file system than on Frame in memory.  Unfortunately not in a position to cause a refresh.
                        }
                }
                
                SessionStats.CreatedText();
                Text t;
                
                if (templateType.length() == 0) {
                        t = getItemTemplate().copy();
                } else {
                        t = getItemTemplate(templateType.charAt(0));
                }
                
                // reset attributes
                t.setID(getNextItemID());
                t.setPosition(DisplayController.getMousePosition());
                t.setText("");
                t.setParent(this);

                // Set the width if the template doesnt have a width
                // Make it the width of the page
                // t.setMaxWidth(FrameGraphics.getMaxFrameSize().width);
                // if (t.getWidth() <= 0) {
                // String maxWidthString = getAnnotationValue("maxwidth");
                // int width = FrameGraphics.getMaxFrameSize().width;
                // if (maxWidthString != null) {
                // try {
                // width = Math.min(width, Integer.parseInt(maxWidthString));
                // } catch (NumberFormatException nfe) {
                // }
                // }
                //
                // t.setRightMargin(width);
                // }
                addItem(t);
                return t;
        }
        
        /**
         * Returns the data associated with the frame.
         * @return
         */
        public List<String> getData() {
                return _frameData;
        }
        
        /**
         * Adds a piece of data to be associated with the frame.
         * @param dataItem
         */
        public void addToData(String dataItem) {
                if (dataItem != null) {
                        if (_frameData == null)
                                _frameData = new LinkedList<String>();
                        _frameData.add(dataItem);
                }
        }

        /**
         * Returns the path (String) to the .exp file that this Frame represents.
         * This follows redirects, meaning that it provides the actual file from which 
         * the frames data is drawn from.
         * @return The path to the .exp file that this Frame represents
         * @see getFramePathLogical
         * @see getFramesetPath
         */
        public String getFramePathReal() {
                String framesetPath = getFramesetPath();
                String redirect = ExpReader.redirectTo(getFramePathLogical());
                
                if (redirect == null) {
                        return getFramePathLogical();
                }
                
                while (redirect != null) {
                        framesetPath = getFramesetPath() + redirect;
                        redirect = ExpReader.redirectTo(redirect);
                }
                return framesetPath;
        }

        /**
         * Returns the path (String) to the .exp file that this Frame represents.
         * Does not follow redirects, opting to instead provide the logical path to this file.
         * @return The path to the .exp file that this Frame represents
         * @see getFramePathReal
         * @see getFramesetPath
         */
        public String getFramePathLogical() {
                return getFramesetPath() + this.getNumber() + ExpReader.EXTENTION;
        }

        /**
         * Returns the path (String) to the frameset directory that the file that this Frame represents is contained within.
         * @return The path to this Frames frameset directory
         * @see getFramesetPathLogical
         * @see getFramesetPathReal
         */
        public String getFramesetPath() {
                return this.getPath() + File.separator + this.getFramesetName() + File.separator;
        }

        public Item createDot() {
                Item dot = new Dot(DisplayController.getMouseX(), DisplayController.getMouseY(), getNextItemID());

                Item template = getTemplate(_dotTemplate, ItemUtils.TAG_DOT_TEMPLATE);
                float thickness = template.getThickness();
                if (thickness > 0) {
                        dot.setThickness(template.getThickness());
                }
                if (template.getLinePattern() != null) {
                        dot.setLinePattern(template.getLinePattern());
                }
                dot.setColor(template.getColor());
                dot.setFillColor(template.getFillColor());
                // reset attributes
                dot.setParent(this);
                return dot;
        }

        private Text getTemplate(Text defaultTemplate, int templateTag)
        {
                Text t = null;

                // check for an updated template...
                for (Item i : this.getItems()) {
                        if (ItemUtils.startsWithTag(i, templateTag)) {
                                t = (Text) i;
                                break;
                        }
                }

                if (t == null) {
                        if (defaultTemplate == null) {
                                return null;
                        }
                        
                        t = defaultTemplate;
                }

                // If the item is linked apply any attribute pairs on the child frame
                String link = t.getAbsoluteLink();
                
                // need to get link first because copy doesnt copy the link
                t = t.copy();
                t.setTooltip(null);
                if (link != null) {
                        t.setLink(null);
                        Frame childFrame = FrameIO.LoadFrame(link);
                        if (childFrame != null) {
                                // read in attribute value pairs
                                for (Text attribute : childFrame.getBodyTextItems(false)) {
                                        AttributeUtils.setAttribute(t, attribute);
                                }
                        }
                }
                return t;
        }

        /**
         * TODO: Comment. cts16
         * TODO: Remove magic constants. cts16 
         */
        public Text getItemTemplate(char firstChar)
        {
                switch (firstChar) {
                        case '@':
                                return getAnnotationTemplate();
                        case '/':
                        case '#':
                                return getCodeCommentTemplate();
                        default:
                                return getItemTemplate();
                }
        }

        public Text createNewText()
        {
                return createNewText("");
        }

        public Text addText(int x, int y, String text, String action)
        {
                Text t = createNewText(text);
                t.setPosition(x, y);
                t.addAction(action);
                return t;
        }

        public Text addText(int x, int y, String text, String action, String link)
        {
                Text t = addText(x, y, text, action);
                t.setLink(link);
                return t;
        }

        public Dot addDot(int x, int y)
        {
                Dot d = new Dot(x, y, getNextItemID());
                addItem(d);
                return d;
        }

        /**
         * Adds a rectangle to the frame
         * 
         * @param x
         *            X coordinate of the top-left corner of the rectangle
         * @param y
         *            Y coordinate of the top-left corner of the rectangle
         * @param width
         *            Width of the rectangle
         * @param height
         *            Height of the rectangle
         * @param borderThickness
         *            Thickness, in pixels, of the rectangle's border/outline
         * @param borderColor
         *            Color of the rectangle's border/outline
         * @param fillColor
         *            Color to fill the rectangle with
         */
        public List<Item> addRectangle(int x, int y, int width, int height, float borderThickness, Colour borderColor, Colour fillColor)
        {
                List<Item> rectComponents = new ArrayList<Item>();
                Item[] corners = new Item[4];

                // Top Left
                corners[0] = this.createDot();
                corners[0].setPosition(x, y);

                // Top Right
                corners[1] = this.createDot();
                corners[1].setPosition(x + width, y);

                // Bottom Right
                corners[2] = this.createDot();
                corners[2].setPosition(x + width, y + height);

                // Bottom Left
                corners[3] = this.createDot();
                corners[3].setPosition(x, y + height);

                // Add corners to the collection and setting their attributes
                for (int i = 0; i < corners.length; i++) {
                        corners[i].setThickness(borderThickness);
                        corners[i].setColor(borderColor);
                        corners[i].setFillColor(fillColor);
                        rectComponents.add(corners[i]);
                }

                // create lines between the corners
                rectComponents.add(new Line(corners[0], corners[1], this.getNextItemID()));
                rectComponents.add(new Line(corners[1], corners[2], this.getNextItemID()));
                rectComponents.add(new Line(corners[2], corners[3], this.getNextItemID()));
                rectComponents.add(new Line(corners[3], corners[0], this.getNextItemID()));

                // Add constraints between each corner
                new Constraint(corners[0], corners[1], this.getNextItemID(), Constraint.HORIZONTAL);
                new Constraint(corners[2], corners[3], this.getNextItemID(), Constraint.HORIZONTAL);
                new Constraint(corners[1], corners[2], this.getNextItemID(), Constraint.VERTICAL);
                new Constraint(corners[3], corners[0], this.getNextItemID(), Constraint.VERTICAL);

                List<Item> rect = new ArrayList<Item>(rectComponents);
                this.addAllItems(rectComponents);
                StandardGestureActions.anchor(rectComponents);
                return rect;
        }

        public boolean isSaved()
        {
                return _saved;
        }

        public void setSaved()
        {
                _saved = true;
                _change = false;
        }

        public static boolean rubberbandingLine()
        {
                return  FreeItems.getInstance().size() == 2 &&
                                (FreeItems.getInstance().get(0) instanceof Line || FreeItems.getInstance().get(1) instanceof Line);
        }

        /**
         * Tests if an item is a non title, non frame name, non special annotation
         * text item.
         * 
         * @param it
         *            the item to be tested
         * @return true if the item is a normal text item
         */
        public boolean isNormalTextItem(Item it)
        {
                if (it instanceof Text && it != getTitleItem() && it != _frameName && !((Text) it).isSpecialAnnotation()) {
                        return true;
                }

                return false;
        }

        /**
         * Moves the mouse to the end of the text item with a specified index.
         * 
         * @param index
         */
        public boolean moveMouseToTextItem(int index)
        {
                List<Item> items = getItems();
                int itemsFound = 0;
                for (int i = 0; i < items.size(); i++) {
                        Item it = items.get(i);
                        if (isNormalTextItem(it)) {
                                itemsFound++;
                        }
                        if (itemsFound > index) {
                                DisplayController.setCursorPosition(((Text) it).getParagraphEndPosition().getX(), it.getY());
                                DisplayController.resetCursorOffset();
                                DisplayController.requestRefresh(true);
                                return true;
                        }
                }

                return false;
        }

        /**
         * Searches for an annotation item called start to be used as the default
         * cursor location when TDFC occurs.
         * 
         * TODO: Remove magic constants. cts16
         */
        public boolean moveMouseToDefaultLocation()
        {
                List<Item> items = getItems();

                for (Item it : items) {
                        if (it instanceof Text) {
                                Text t = (Text) it;
                                if (t.getText().toLowerCase().startsWith("@start") || t.getText().toLowerCase().equals("@start:")) {
                                        // Used to allow users the option of putting an initial
                                        // bullet after the @start
                                        // This was replaced by width
                                        // t.stripFirstWord();
                                        t.setText("");

                                        if (t.getText().equals("")) {
                                                DisplayController.getCurrentFrame().removeItem(t);
                                        }
                                        
                                        if (!FreeItems.hasItemsAttachedToCursor()) {
                                                DisplayController.setCursorPosition(((Text) it).getParagraphEndPosition());
                                                DisplayController.resetCursorOffset();
                                        }
                                        
                                        DisplayController.requestRefresh(true);
                                        
                                        return true;
                                }
                        }
                }

                return false;
        }

        /**
         * Gets the file name that actions should use to export files created by
         * running actions from this frame.
         * 
         * @return the fileName if the frame contains an '@file' tag. Returns the
         *         name of the frame if the tag isnt on the frame.
         */
        public String getExportFileName()
        {
                String fileName = getExportFileTagValue();

                if (fileName == null) {
                        fileName = getTitle();

                        if (fileName == null) {
                                fileName = getName();
                        }
                }

                return fileName;
        }

        public void toggleBackgroundColor()
        {
                setBackgroundColor(ColorUtils.getNextColor(_background, TemplateSettings.BackgroundColorWheel.get(), null));
        }

        public void setName(String frameset, int i)
        {
                setFrameset(frameset);
                setFrameNumber(i);
        }

        /**
         * Sets the item permissions to match the protection for the frame.
         * No longer sets item permissions, since items can have their own permissions now (but still default to frame permissions) 
         * 
         */
        public void refreshItemPermissions(UserAppliedPermission maxPermission)
        {
                if(_frameName == null) {
                        return;
                }
                
                UserAppliedPermission permission = UserAppliedPermission.min(maxPermission, getUserAppliedPermission());

                switch (permission) {
                case none:
                        _frameName.setBackgroundColor(FRAME_NAME_BACKGROUND_COLOUR_FOR_PERMISSION_NONE);
                        break;
                case followLinks:
                        _frameName.setBackgroundColor(FRAME_NAME_BACKGROUND_COLOUR_FOR_PERMISSION_FOLLOW_LINKS);
                        break;
                case copy:
                        _frameName.setBackgroundColor(FRAME_NAME_BACKGROUND_COLOUR_FOR_PERMISSION_COPY);
                        break;
                case createFrames:
                        _frameName.setBackgroundColor(FRAME_NAME_BACKGROUND_COLOUR_FOR_PERMISSION_CREATE_FRAMES);
                        break;
                case full:
                        _frameName.setBackgroundColor(FRAME_NAME_BACKGROUND_COLOUR_FOR_PERMISSION_FULL);
                        break;
                default:
                        assert (false);
                        break;
                }

                for (Overlay o : getOverlays()) {
                        for(Item i : o.Frame._body) {
                                i.setOverlayPermission(o.permission);
                        }
                        o.Frame.refreshItemPermissions(o.permission);
                }
        }

        public boolean isTestFrame()
        {
                Text title = getTitleItem();
                if (title == null) {
                        return false;
                }
                String action = title.getFirstAction();
                if (action == null) {
                        return false;
                }
                action = action.toLowerCase();
                return action.startsWith(Simple.RUN_FRAME_ACTION) || action.startsWith(Simple.DEBUG_FRAME_ACTION);
        }

        public void setActiveTime(String activeTime)
        {
                try {
                        _activeTime = new Time(Time.valueOf(activeTime).getTime() + 12 * 60 * 60 * 1000);
                } catch (Exception e) {
                        _activeTime = new Time(0);
                }
        }

        public void setActiveTime(Time activeTime)
        {
                _activeTime = activeTime;
        }

        public void setDarkTime(Time darkTime)
        {
                _darkTime = darkTime;
        }

        public void setDarkTime(String darkTime)
        {
                try {
                        _darkTime = new Time(Time.valueOf(darkTime).getTime() + 12 * 60 * 60 * 1000);
                } catch (Exception e) {
                        _darkTime = new Time(0);
                }
        }

        /**
         * Returns null if their is no backup frame or if it is invalid.
         * 
         * @return the backup frame for this frame
         */
        public Frame getBackupFrame()
        {
                Text backupTag = _annotations.get("old");
                if (backupTag == null) {
                        return null;
                }
                
                // TODO want another way to deal with updating of annotations items
                // without F12 refresh
                // Reparse the frame if annotation item has been modified
                String[] processedText = backupTag.getProcessedText();
                if (processedText == null) {
                        // Reparse the frame if this item has not yet been parsed
                        FrameUtils.Parse(this);
                        return getBackupFrame();
                }
                
                // Now return the name of the backed up frame
                String link = backupTag.getAbsoluteLink();
                if (link == null || link.equalsIgnoreCase(getName())) {
                        return null;
                }

                Frame backup = FrameIO.LoadFrame(link);
                return backup;
        }

        public Time getDarkTime()
        {
                return _darkTime;
        }

        public Time getActiveTime()
        {
                return _activeTime;
        }

        /**
         * Gets the number of backed up versions of this frame are saved plus 1 for
         * this frame.
         * 
         * @return the number of frames in the backed up comet
         */
        public int getCometLength()
        {
                Frame backup = getBackupFrame();
                return 1 + (backup == null ? 0 : backup.getCometLength());
        }

        public void addAnnotation(Text item)
        {
                if (_annotations == null) {
                        _annotations = new HashMap<String, Text>();
                }
                
                // Check if this item has already been processed
                String[] tokens = item.getProcessedText();
                if (tokens != null) {
                        if (tokens.length > 0) {
                                _annotations.put(tokens[0], item);
                        }
                        return;
                }

                String text = item.getText().trim();
                assert (text.charAt(0) == '@');
                
                // Ignore annotations with spaces after the tag symbol
                if (text.length() < 2 || !Character.isLetter(text.charAt(1))) {
                        item.setProcessedText(new String[0]);
                        return;
                }
                
                // The separator char must come before the first non letter otherwise we
                // ignore the annotation item
                for (int i = 2; i < text.length(); i++) {
                        char ch = text.charAt(i);
                        if (!Character.isLetterOrDigit(ch)) {
                                // Must have an attribute value pair
                                if (ch == AttributeValuePair.SEPARATOR_CHAR) {
                                        // Get the attribute
                                        String attribute = text.substring(1, i).toLowerCase();
                                        String value = "";
                                        if (text.length() > 1 + i) {
                                                value = text.substring(i + 1).trim();
                                        }
                                        item.setProcessedText(new String[] { attribute, value });
                                        _annotations.put(attribute, item);
                                        return;
                                } else {
                                        item.setProcessedText(new String[0]);
                                        return;
                                }
                        }
                }
                
                // If it was nothing but letters and digits save the tag
                String lowerCaseText = text.substring(1).toLowerCase();
                item.setProcessedText(new String[] { lowerCaseText });
                _annotations.put(lowerCaseText, item);
        }

        public boolean hasAnnotation(String annotation)
        {
                if (_annotations == null) {
                        refreshAnnotationList();
                }
                
                return _annotations.containsKey(annotation.toLowerCase());
        }

        /**
         * Returns the annotation value in full case.
         * 
         * @param annotation
         *            the annotation to retrieve the value of.
         * @return the annotation item value in full case or null if the annotation
         *         is not on the frame or has no value.
         */
        public String getAnnotationValue(String annotation)
        {
                if (_annotations == null) {
                        refreshAnnotationList();
                }

                Text text = _annotations.get(annotation.toLowerCase());
                if (text == null) {
                        return null;
                }

                String[] tokens = text.getProcessedText();
                
                if (tokens != null && tokens.length > 1) {
                        return tokens[1];
                }
                
                return null;
        }

        public void clearAnnotations()
        {
                _annotations = null;
        }

        public List<Item> getVisibleItems()
        {
                return getItems(true);
        }

        private void refreshAnnotationList()
        {
                if (_annotations == null) {
                        _annotations = new HashMap<String, Text>();
                } else {
                        _annotations.clear();
                }
                
                for (Text text : getTextItems()) {
                        if (text.isAnnotation()) {
                                addAnnotation(text);
                        }
                }
        }

        public Collection<Text> getAnnotationItems()
        {
                if (_annotations == null) {
                        refreshAnnotationList();
                }
                
                return _annotations.values();
        }

        /**
         * Gets a list of items to be saved to file by text file writers.
         * 
         * @return the list of items to be saved to a text file
         */
        public List<Item> getItemsToSave() {
                if (!_sorted) {
                        Collections.sort(_body);
                        _sorted = true;
                }

                // iWidgets are handled specially since 8 items are written as one
                Collection<Widget> seenWidgets = new LinkedHashSet<Widget>();

                List<Item> toSave = new ArrayList<Item>();

                for (Item i : _body) {
                        if (i == null || i.dontSave()) {
                                continue;
                        }

                        // Ensure only one of the WidgetCorners represent a single widget
                        if (i instanceof WidgetCorner) {
                                Widget iw = ((WidgetCorner) i).getWidgetSource();
                                if (seenWidgets.contains(iw)) {
                                        continue;
                                }
                                seenWidgets.add(iw);
                                toSave.add(iw.getSource());
                        } else if (i instanceof XRayable) {
                                XRayable x = (XRayable) i;
                                toSave.addAll(x.getItemsToSave());
                        // Circle centers are items with attached enclosures
                        } else if (i.hasEnclosures()) {
                                continue;
                        } else {
                                toSave.add(i);
                        }
                }

                for (Vector v : getVectors()) {
                        toSave.add(v.Source);
                }

                return toSave;
        }
        
        public List<Item> getSurrogateItemsToSave() {
                List<Item> surrogates = new ArrayList<Item>();
                _body.forEach(item -> surrogates.addAll(item.getSurrogates()));
                return surrogates;
        }

        public Collection<Item> getOverlayItems()
        {
                return _overlayItems;
        }

        /**
         * Returns true if this frame has and overlays for the specified frame.
         * 
         * @param frame
         * @return
         */
        public boolean hasOverlay(Frame frame)
        {
                return _overlays.containsValue(frame);
        }

        public Collection<Item> getAllItems()
        {
                Collection<Item> allItems = new LinkedHashSet<Item>(_body);
                
                allItems.addAll(_overlayItems);
                allItems.addAll(_vectorItems);
                return allItems;
        }

        public Collection<Item> getVectorItems()
        {
                Collection<Item> vectorItems = new LinkedHashSet<Item>(_vectorItems);
                vectorItems.addAll(getNonAnnotationItems(false));
                return vectorItems;
        }

        /**
         * Gets a list of all the text items on the frame.
         * 
         * @return
         */
        public Collection<Text> getTextItems()
        {
                Collection<Text> textItems = new ArrayList<Text>();
                
                for (Item i : getItems(true)) {
                        // only add up normal body text items
                        if ((i instanceof Text)) {
                                textItems.add((Text) i);
                        }
                }
                
                return textItems;
        }

        public Text getAnnotation(String annotation)
        {
                if (_annotations == null) {
                        refreshAnnotationList();
                }

                return _annotations.get(annotation.toLowerCase());
        }

        public void recalculate()
        {
                for (Item i : getItems()) {
                        if (i.hasFormula() && !i.isAnnotation()) {
                                i.calculate(i.getFormula());
                        }
                }
        }

        public void removeObserver(FrameObserver observer)
        {
                _observers.remove(observer);
        }

        public void addObserver(FrameObserver observer)
        {
                _observers.add(observer);
        }

        public void clearObservers()
        {
                for (FrameObserver fl : _observers) {
                        fl.removeSubject(this);
                }
                
                // The frame listener will call the frames removeListener method
                assert (_observers.size() == 0);
        }

        public Collection<Text> getNonAnnotationText(boolean removeTitle)
        {
                Collection<Text> items = new LinkedHashSet<Text>();
                
                for (Item i : getItems(true)) {
                        // only add up normal body text items
                        if (i instanceof Text && !i.isAnnotation()) {
                                items.add((Text) i);
                        }
                }
                
                if (removeTitle) {
                        items.remove(getTitleItem());
                }
                
                return items;
        }

        public void dispose()
        {
                clearObservers();
                
                for (Item i : _body) {
                        i.dispose();
                }
                
                _frameName.dispose();
                _body = null;
                _frameName = null;
        }

        public void parse()
        {
                for (Overlay o : getOverlays()) {
                        o.Frame.parse();
                }
                
                // Must parse the frame AFTER the overlays
                FrameUtils.Parse(this);
        }

        public void setPath(String path)
        {
                this.path = path;
        }

        public String getPath()
        {
                return path;
        }

        public void setLocal(boolean isLocal)
        {
                this._isLocal = isLocal;
        }

        public boolean isLocal()
        {
                return _isLocal;
        }

        public String getExportFileTagValue()
        {
                return getAnnotationValue("file");
        }

        public void assertEquals(Frame frame2)
        {
                // Check that all the items on the frame are the same
                List<Item> items1 = getVisibleItems();
                List<Item> items2 = frame2.getVisibleItems();
                
                if (items1.size() != items2.size()) {
                        throw new UnitTestFailedException(items1.size() + " items", items2.size() + " items");
                } else {
                        for (int i = 0; i < items1.size(); i++) {
                                Item i1 = items1.get(i);
                                Item i2 = items2.get(i);
                                String s1 = i1.getText();
                                String s2 = i2.getText();
                                if (!s1.equals(s2)) {
                                        throw new UnitTestFailedException(s1, s2);
                                }
                        }
                }
        }

        public boolean hasObservers()
        {
                return _observers != null && _observers.size() > 0;
        }
        
        public List<Item> getBodyItemsWithInsufficientPermissions() {
                return _bodyHiddenDueToPermissions;
        }
        
        public void moveItemToBodyHiddenDueToPermission(final Item i) {
                _body.remove(i);
                _bodyHiddenDueToPermissions.add(i);
        }
        
        public void moveItemFromBodyHiddenDueToPermission(Item i, PermissionTriple newPermission) {
                if (_bodyHiddenDueToPermissions.contains(i)) {
                        _bodyHiddenDueToPermissions.remove(i);
                        i.setPermission(newPermission);
                        _body.add(i);
                }
        }

        public Collection<? extends Item> getInteractableItems() {
                /*
                 * TODO: Cache the interactableItems list so we dont have to recreate it
                 * every time this method is called
                 */
                if (_interactableItems.size() > 0) {
                        return _interactableItems;
                }

                for (Item i : _body) {
                        if (i == null) {
                                continue;
                        }
                        if (i.isVisible()) {
                                _interactableItems.add(i);
                        }
                }

                for (Item i : _overlayItems) {
                        if (i.hasPermission(UserAppliedPermission.followLinks)) {
                                _interactableItems.add(i);      
                        }
                }

                for (Item i : _vectorItems) {
                        if (i.hasPermission(UserAppliedPermission.none)) {
                                _interactableItems.add(i);
                        }
                }

                return _interactableItems;
        }
        
        public String getEncryptionLabel() {
                return _encryptionLabel;
        }
        
        public void setEncryptionLabel(String label) {
                this.setChanged(true);
                _encryptionLabel = label;
        }
        
        public EncryptionPermissionTriple getEncryptionPermission() {
                return _encPermissionTriple;
        }
        
        public void setEncryptionPermission(EncryptionPermissionTriple p) {
                _encPermissionTriple = p;
        }

        public String getGroup() {
                return _groupFrameName;
        }

        public void setGroup(String _groupFrame) {
                this._groupFrameName = _groupFrame;
                this._groupFrame = null;
        }
        
        public Frame getGroupFrame() {
                if (this._groupFrame != null) {
                        return this._groupFrame;
                } else {
                        this._groupFrame = FrameIO.LoadFrame(this._groupFrameName + 1, FrameIO.GROUP_PATH);
                        return this._groupFrame;
                }
        }
        
        public void setGroupFrame(Frame frame) {
                this._groupFrame = frame;
        }
        
        public List<String> getGroupMembers() {
                List<String> members = new ArrayList<String>();
                if (getGroupFrame() != null) {
                        Collection<Text> textItems = getGroupFrame().getTextItems();
                        Stream<Text> memberLists = textItems.stream().filter(t -> 
                                t.getText().toLowerCase().startsWith("@owner: ") || 
                                t.getText().toLowerCase().startsWith("@members: "));
                        for(Text t: memberLists.collect(Collectors.toList())) {
                                if (t.getText().toLowerCase().startsWith("@owner: ")) {
                                        members.add(t.getText().substring(8));
                                } else if (t.getText().toLowerCase().startsWith("@members: ")) {
                                        //10
                                        String[] split = t.getText().substring(10).split(",");
                                        for (String m: split) {
                                                members.add(m.trim());
                                        }
                                }
                        }
                }
                return members;
        }

        private static final class History {
                
                public enum Type {
                        deletion,
                        movement
                }
                
                public final List<Item> items;
                
                public final Type type;
                
                public History(Collection<Item> items, Type type)
                {
                        this.items = new LinkedList<Item>(items);
                        this.type = type;
                }
                
                @Override
                public String toString()
                {
                        return this.type.toString() + ":\n" + this.items.toString();
                }
        }
}