BeanContextListModel


1   /*
2    * EJTools, the Enterprise Java Tools
3    *
4    * Distributable under LGPL license.
5    * See terms of license at www.gnu.org.
6    */
7   package org.ejtools.adwt;
8   
9   import java.beans.beancontext.BeanContext  ;
10  import java.beans.beancontext.BeanContextMembershipEvent  ;
11  import java.beans.beancontext.BeanContextMembershipListener  ;
12  import java.util.Collection  ;
13  import java.util.Iterator  ;
14  import java.util.Vector  ;
15  
16  import javax.swing.ListModel  ;
17  import javax.swing.event.ListDataEvent  ;
18  import javax.swing.event.ListDataListener  ;
19  
20  /**
21   * Description of the Class
22   *
23   * @author    Laurent Etiemble
24   * @version   $Revision: 1.2 $
25   */
26  public class BeanContextListModel implements ListModel  , BeanContextMembershipListener  
27  {
28     /** Description of the Field */
29     protected Collection   listeners = new Vector  ();
30     /** Description of the Field */
31     protected BeanContext   root;
32  
33  
34     /**
35      * Constructor for the BeanContextListModel object
36      *
37      * @param root  Description of the Parameter
38      */
39     public BeanContextListModel(BeanContext   root)
40     {
41        this.root = root;
42        this.root.addBeanContextMembershipListener(this);
43     }
44  
45  
46     /**
47      * Adds a feature to the ListDataListener attribute of the
48      * BeanContextListModel object
49      *
50      * @param l  The feature to be added to the ListDataListener attribute
51      */
52     public void addListDataListener(ListDataListener   l)
53     {
54        this.listeners.add(l);
55     }
56  
57  
58     /**
59      * Description of the Method
60      *
61      * @param bcme  Description of the Parameter
62      */
63     public void childrenAdded(BeanContextMembershipEvent   bcme)
64     {
65        this.fireContentsChanged();
66     }
67  
68  
69     /**
70      * Description of the Method
71      *
72      * @param bcme  Description of the Parameter
73      */
74     public void childrenRemoved(BeanContextMembershipEvent   bcme)
75     {
76        this.fireContentsChanged();
77     }
78  
79  
80     /**
81      * Gets the elementAt attribute of the BeanContextListModel object
82      *
83      * @param index  Description of the Parameter
84      * @return       The elementAt value
85      */
86     public Object   getElementAt(int index)
87     {
88        int i = 0;
89        Object   result = null;
90        for (Iterator   it = this.root.iterator(); it.hasNext(); i++)
91        {
92           result = it.next();
93           if (i == index)
94           {
95              break;
96           }
97           result = null;
98        }
99        return result;
100    }
101 
102 
103    /**
104     * Gets the size attribute of the BeanContextListModel object
105     *
106     * @return   The size value
107     */
108    public int getSize()
109    {
110       return root.size();
111    }
112 
113 
114    /**
115     * Description of the Method
116     *
117     * @param l  Description of the Parameter
118     */
119    public void removeListDataListener(ListDataListener   l)
120    {
121       this.listeners.remove(l);
122    }
123 
124 
125    /** Description of the Method */
126    protected void fireContentsChanged()
127    {
128       ListDataEvent   event = new ListDataEvent  (this, ListDataEvent.CONTENTS_CHANGED, 0, this.root.size());
129       Object  [] copy = this.listeners.toArray();
130       for (int i = 0; i < copy.length; i++)
131       {
132          ListDataListener   listener = (ListDataListener  ) copy[i];
133          listener.contentsChanged(event);
134       }
135    }
136 
137 
138    /** Description of the Method */
139    protected void fireIntervalAdded() { }
140 
141 
142    /** Description of the Method */
143    protected void fireIntervalRemoved() { }
144 }
145
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