archive/net.sourceforge.phpeclipse.quantum.sql/src/com/quantum/view/bookmark/BookmarkListNode.java

   1 package com.quantum.view.bookmark;
   2
   3 import java.beans.PropertyChangeEvent;
   4 import java.beans.PropertyChangeListener;
   5 import java.beans.PropertyChangeSupport;
   6 import java.util.Arrays;
   7 import java.util.Collections;
   8 import java.util.Hashtable;
   9 import java.util.Iterator;
  10 import java.util.Map;
  11
  12 import com.quantum.model.Bookmark;
  13 import com.quantum.model.BookmarkCollection;
  14
  15
  16 /**
  17  * @author root
  18  */
  19 public final class BookmarkListNode extends TreeNode implements PropertyChangeListener {
  20     final static BookmarkListNode instance = new BookmarkListNode();
  21         final static TreeNode[] EMPTY_ARRAY = new TreeNode[0];
  22     private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);
  23     private boolean initialized = false;
  24
  25     private BookmarkListNode() {
  26         super(null);
  27     }
  28
  29     public static BookmarkListNode getInstance() {
  30         return BookmarkListNode.instance;
  31     }
  32
  33         /**
  34          * @see com.quantum.view.bookmark.TreeNode#getChildren()
  35          */
  36         public Object[] getChildren() {
  37         if (!initialized) {
  38             initializeChildren();
  39             BookmarkCollection.getInstance().addPropertyChangeListener(this);
  40         }
  41         BookmarkNode[] nodes = (BookmarkNode[]) this.children.toArray(
  42             new BookmarkNode[this.children.size()]);
  43         Arrays.sort(nodes);
  44         return nodes;
  45         }
  46
  47         /**
  48          * @see com.quantum.view.bookmark.TreeNode#hasChildren()
  49          */
  50         public boolean hasChildren() {
  51                 return true;
  52         }
  53
  54         public String getName() {
  55                 return "ROOT"; //$NON-NLS-1$
  56         }
  57     protected String getImageName() {
  58         return null;
  59     }
  60     /**
  61      * @param listener
  62      */
  63     public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
  64         this.propertyChangeSupport.addPropertyChangeListener(listener);
  65     }
  66
  67     /**
  68      * @param listener
  69      */
  70     public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
  71         this.propertyChangeSupport.removePropertyChangeListener(listener);
  72     }
  73     protected void firePropertyChange(PropertyChangeEvent event) {
  74         this.propertyChangeSupport.firePropertyChange(event);
  75     }
  76
  77     protected synchronized void initializeChildren() {
  78         boolean changed = false;
  79         Map temp = new Hashtable();
  80         for (Iterator i = this.children.iterator(); i.hasNext();) {
  81             BookmarkNode bookmark = (BookmarkNode) i.next();
  82             temp.put(bookmark.getName(), bookmark);
  83         }
  84
  85         this.children.clear();
  86
  87         Bookmark[] bookmarks = BookmarkCollection.getInstance().getBookmarks();
  88         for (int i = 0, length = (bookmarks == null) ? 0 : bookmarks.length; i < length; i++) {
  89
  90             BookmarkNode node = (BookmarkNode) temp.remove(bookmarks[i].getName());
  91             if (node == null) {
  92                 this.children.add(new BookmarkNode(this, bookmarks[i]));
  93                 changed = true;
  94             } else {
  95                 this.children.add(node);
  96             }
  97         }
  98
  99         for (Iterator i = temp.values().iterator(); i.hasNext(); ) {
 100             ((TreeNode) i.next()).dispose();
 101             changed = true;
 102         }
 103
 104         Collections.sort(this.children);
 105         this.initialized = true;
 106
 107         if  (temp.size() > 0 || changed ) {
 108             firePropertyChange("bookmarks", null, null);
 109         }
 110     }
 111
 112     /**
 113      * @see java.beans.PropertyChangeListener#propertyChange(java.beans.PropertyChangeEvent)
 114      */
 115     public void propertyChange(PropertyChangeEvent event) {
 116         if ("bookmarks".equals(event.getPropertyName())) {
 117             initializeChildren();
 118         }
 119     }
 120 }