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Java > Open Source Codes > nextapp > echo2 > app > list > ListModel


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package nextapp.echo2.app.list;
31
32 import java.io.Serializable JavaDoc;
33
34 import nextapp.echo2.app.event.ListDataListener;
35
36 /**
37  * A data model for list type components (SelectFields and ListBoxes).
38  */
39 public interface ListModel
40 extends Serializable JavaDoc {
41
42     /**
43      * Adds a <code>ListDataListener</code> to the model.
44      * <code>ListDataListener</code>s are notified whenever the model
45      * changes.
46      *
47      * @param l the <code>ListDataListener</code> to add
48      */
49     public void addListDataListener(ListDataListener l);
50
51     /**
52      * Returns the value at the specified index in the list.
53      *
54      * @param index the index
55      * @return the value
56      */
57     public Object JavaDoc get(int index);
58
59     /**
60      * Returns the size of the list.
61      *
62      * @return the size
63      */
64     public int size();
65     
66     /**
67      * Removes a <code>ListDataListener</code> from the model.
68      * <code>ListDataListener</code> are notified whenever the model changes.
69      *
70      * @param l the <code>ListDataListener</code> to remove
71      */
72     public void removeListDataListener(ListDataListener l);
73 }
74
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