source: trunk/src/org/expeditee/agents/DisplayComet.java@ 1102

/**
 *    DisplayComet.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.agents;

import java.util.Collection;
import java.util.HashSet;
import java.util.Stack;

import org.expeditee.gui.DisplayController;
import org.expeditee.gui.Frame;
import org.expeditee.gui.FrameIO;
import org.expeditee.gui.MessageBay;
import org.expeditee.items.Item;
import org.expeditee.items.ItemUtils;

public class DisplayComet extends DefaultAgent {
        private Stack<Frame> _frameList = new Stack<Frame>();

        public DisplayComet(String delay) {
                super(delay);
        }

        public DisplayComet() {
                super();
        }

        @Override
        protected Frame process(Frame frame) {
                Collection<String> seen = new HashSet<String>();

                DisplayController.addToBack(frame);

                // Goto the end of the comet
                Item old = null;
                Frame oldFrame = frame;
                while (oldFrame != null) {
                        if (_stop)
                                return null;
                        seen.add(oldFrame.getName().toLowerCase());
                        _frameList.push(oldFrame);
                        old = ItemUtils.FindExactTag(oldFrame.getItems(), ItemUtils
                                        .GetTag(ItemUtils.TAG_BACKUP));
                        oldFrame = null;
                        if (old != null) {
                                String link = old.getAbsoluteLink();

                                if (link != null) {
                                        String linkLowerCase = link.toLowerCase();
                                        if (!seen.contains(linkLowerCase)) {
                                                oldFrame = FrameIO.LoadFrame(linkLowerCase);
                                                MessageBay.overwriteMessage("Loading frames: " + link);
                                        }
                                }
                        }
                }
                // Back out one frame at a time
                while (!_frameList.empty()) {
                        if (_stop)
                                return null;
                        DisplayController.setCurrentFrame(_frameList.pop(), true);
                        _frameCount++;
                        pause(_delay);
                }

                return _start;
        }

}