content: // This file is part of AceWiki.
  // Copyright 2008-2013, AceWiki developers.
  // 
  // AceWiki is free software: you can redistribute it and/or modify it under the terms of the GNU
  // Lesser General Public License as published by the Free Software Foundation, either version 3 of
  // the License, or (at your option) any later version.
  // 
  // AceWiki 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
  // Lesser General Public License for more details.
  // 
  // You should have received a copy of the GNU Lesser General Public License along with AceWiki. If
  // not, see http://www.gnu.org/licenses/.
  
  package ch.uzh.ifi.attempto.acewiki.gui;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  
  import nextapp.echo.app.Column;
  import nextapp.echo.app.Extent;
  import nextapp.echo.app.Font;
  import nextapp.echo.app.Insets;
  import nextapp.echo.app.event.ActionEvent;
  import nextapp.echo.app.event.ActionListener;
  import ch.uzh.ifi.attempto.acewiki.Wiki;
  import ch.uzh.ifi.attempto.acewiki.core.LanguageUtils;
  import ch.uzh.ifi.attempto.acewiki.core.OntologyElement;
  import ch.uzh.ifi.attempto.acewiki.core.ModuleElement;
  import ch.uzh.ifi.attempto.echocomp.LocaleResources;
  import ch.uzh.ifi.attempto.echocomp.SolidLabel;
  import ch.uzh.ifi.attempto.echocomp.VSpace;
  
  /**
   * This class represents an page that shows an index of all articles that exist in the wiki.
   * 
   * @author Tobias Kuhn
   */
  public class IndexPage extends WikiPage implements ActionListener {
  
  	private static final long serialVersionUID = 6061966610996079528L;
  	
  	private static final int pageSize = 50;
  
  	// Group by first letter if there are more then this number of articles:
  	private static final int simpleViewSize = 100;
  
  	private String chosenChar = "";
  	private int chosenPage = 0;
  	private HashMap<String, OntologyElement> entries = new HashMap<String, OntologyElement>();
  	
  	private Column indexColumn = new Column();
  	private IndexBar letterIndexBar;
  	private IndexBar numberIndexBar;
  	
  	/**
  	 * Creates a new index page.
  	 * 
  	 * @param wiki The wiki instance.
  	 */
  	public IndexPage(Wiki wiki) {
  		super(wiki);
  	}
  	
  	protected void doUpdate() {
  
  		removeAll();
  
  		setTabRow(TabRow.getMainTabRow(TabRow.TAB_INDEX, getWiki()));
  
  		add(new Title(Wiki.getGUIText("acewiki_page_index"), true));
  		addHorizontalLine();
  		add(new VSpace(20));
  		
  		if (getWiki().getOntologyElements().size() > simpleViewSize) {
  			if (chosenChar.isEmpty()) chosenChar = "A";
  			letterIndexBar = new IndexBar(this);
  			letterIndexBar.setActiveButton(chosenChar.charAt(0) - 65);
  			add(letterIndexBar);
  		}
  		
  		numberIndexBar = new IndexBar(0, this);
  		add(numberIndexBar);
  		
  		indexColumn.setInsets(new Insets(10, 5, 5, 20));
  		indexColumn.setCellSpacing(new Extent(2));
  		add(indexColumn);
  		
  		indexColumn.removeAll();
  		
  		entries.clear();
  		boolean gi = getWiki().getConfig().isGrammarIntegrationEnabled();
  		for (OntologyElement e : getWiki().getOntologyElements()) {
  			if (!gi && e instanceof ModuleElement) {
  				continue;
  			}
  			for (String indexWord : e.getHeadwords()) {
  				if (indexWord.toUpperCase().startsWith(chosenChar)) {
  					entries.put(indexWord, e);
  				}
  			}
  		}
  		
  		if (entries.size() == 0) {
  			numberIndexBar.setVisible(false);
  			indexColumn.add(new SolidLabel(
  					Wiki.getGUIText("acewiki_list_empty"),
  					Font.ITALIC,
  					10
  				));
  		} else {
  			int i = ((entries.size()-1) / pageSize) + 1;
  			if (chosenPage > i) chosenPage = 0;
  			numberIndexBar.setNumbers(i);
  			numberIndexBar.setActiveButton(chosenPage);
  			updatePage();
  		}
  	}
  	
  	private void updatePage() {
  		indexColumn.removeAll();
  		
  		List<String> indexWords = new ArrayList<String>(entries.keySet());
  		Collections.sort(indexWords, LocaleResources.getCollator());
  		
  		numberIndexBar.setVisible(entries.size() > pageSize);
  		
  		int max = entries.size();
  		if (max > (chosenPage + 1) * pageSize) max = (chosenPage + 1) * pageSize;
  		
  		for (int i = chosenPage * pageSize; i < max; i++) {
  			String t = indexWords.get(i);
  			OntologyElement el = entries.get(t);
  			t = LanguageUtils.getPrettyPrinted(t);
  			indexColumn.add(new ListItem(new WikiLink(el, t, getWiki(), false)));
  		}
  	}
  	
  	public void actionPerformed(ActionEvent e) {
  		if (e.getSource() == letterIndexBar) {
  			chosenChar = e.getActionCommand();
  			log("page", "pressed: first letter " + chosenChar);
  			chosenPage = 0;
  			update();
  		} else if (e.getSource() == numberIndexBar) {
  			chosenPage = Integer.parseInt(e.getActionCommand()) - 1;
  			log("page", "pressed: page " + (chosenPage+1));
  			updatePage();
  		}
  	}
  	
  	public boolean equals(Object obj) {
  		return obj instanceof IndexPage;
  	}
  	
  	public String toString() {
  		return "-INDEX-";
  	}
  
  }
  