source: trunk/src/org/expeditee/gui/FreeItems.java@ 919

/**
 *    FreeItems.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.awt.Polygon;
import java.util.ArrayList;
import java.util.Collection;
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 org.expeditee.items.Dot;
import org.expeditee.items.Item;
import org.expeditee.items.Line;
import org.expeditee.items.Text;

public class FreeItems extends ArrayList<Item> {

        private static final long serialVersionUID = 1L;

        private static FreeItems _instance = new FreeItems();
        
        private static FreeItems _cursor = new FreeItems();

        private FreeItems() {
        }

        public static FreeItems getCursor() {
                return _cursor;
        }
        
        public static FreeItems getInstance() {
                return _instance;
        }

        @Override
        public void clear() {
                for (Item i : this) {
                        i.invalidateAll();
                        i.invalidateFill();
                }
                super.clear();
        }

        @Override
        public Item remove(int index) {
                Item i = get(index);
                remove(i);
                return i;
        }

        @Override
        public boolean remove(Object o) {
                if (o instanceof Item) {
                        ((Item) o).invalidateAll();
                        ((Item) o).invalidateFill();
                }
                return super.remove(o);
        }

        /**
         * Return true if there is at least one item attached to the end of the
         * cursor.
         * 
         * @return true if at least one item is attached to the cursor.
         */
        public static boolean itemsAttachedToCursor() {
                return getInstance().size() > 0;
        }

        /**
         * Checks if only text items are attached to the cursor.
         * 
         * @return true if at least one item is attached to the cursor and all items
         *         attached are text items.
         */
        public static boolean textOnlyAttachedToCursor() {
                if (!itemsAttachedToCursor())
                        return false;
                for (Item i : getInstance()) {
                        if (!(i instanceof Text)) {
                                return false;
                        }
                }
                return true;
        }

        public static Item getItemAttachedToCursor() {
                if (itemsAttachedToCursor())
                        return getInstance().get(0);
                return null;
        }

        public static Text getTextAttachedToCursor() {
                if (textOnlyAttachedToCursor())
                        return (Text) getInstance().get(0);
                return null;
        }

        /**
         * Creates a list of the free text items.
         * @return the list of free text items
         */
        public static Collection<Text> getTextItems() {
                Collection<Text> textItems = new LinkedList<Text>();
                for (Item i : getInstance()) {
                        if (i instanceof Text) {
                                textItems.add((Text) i);
                        }
                }

                return textItems;
        }

        public static Map<String, Collection<String>> getGroupedText() {
                Map<String, Collection<String>> groupedText = new HashMap<String, Collection<String>>();
                // Go throught the lineEnds
                Collection<Item> addedItems = new HashSet<Item>();
                for (Item i : getInstance()) {
                        if (!(i instanceof Text) || !i.isLineEnd()) {
                                continue;
                        }
                        // Check for text inside the box
                        Collection<String> textList = new LinkedList<String>();
                        for (Text enclosed : getInstance().getTextWithin(i)) {
                                textList.add(enclosed.getText());
                                addedItems.add(enclosed);
                        }
                        if (textList.size() > 0) {
                                groupedText.put(i.getText(), textList);
                        }
                }
                // Now add the items that were not contained in any of the boxes
                Collection<String> outsideList = new LinkedList<String>();
                for (Item i : getInstance()) {
                        if (i instanceof Text && !i.isLineEnd() && !addedItems.contains(i)) {
                                outsideList.add(i.getText());
                        }
                }
                groupedText.put("", outsideList);

                return groupedText;
        }

        /**
         * Gets a list of non-line-end text items within a specified rectangle in
         * the free items list.
         * 
         * @param lineEnd
         * @return
         */
        private Collection<Text> getTextWithin(Item lineEnd) {
                Polygon poly = lineEnd.getEnclosedShape();
                Collection<Text> results = new LinkedHashSet<Text>();
                for (Item i : this) {
                        if (i.intersects(poly) && i instanceof Text && !i.isLineEnd()) {
                                results.add((Text) i);
                        }
                }
                return results;
        }

        public static boolean hasCursor() {
                return getCursor().size() > 0;
        }

        public static void setCursor(Collection<Item> cursor) {
                _cursor.clear();
                _cursor.addAll(cursor);
        }
        
        public static boolean hasMultipleVisibleItems() {
                List<Item> toCount = new LinkedList<Item>(getInstance());
                int c = 0;
                while(!toCount.isEmpty()) {
                        Item i = toCount.remove(0);
                        if(i.isVisible()) {
                                toCount.removeAll(i.getAllConnected()); // treat polygons as a single item
                                if(c++ > 0) return true;
                        }
                }
                return false;
        }
        
        public static boolean isDrawingPolyLine() {
                List<Item> tmp = getInstance();
                return tmp.size() == 2 && tmp.get(0) instanceof Dot && tmp.get(1) instanceof Line;
        }
}