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Java > Open Source Codes > org > eclipse > jface > viewers > TreeNodeContentProvider


1 /*******************************************************************************
2  * Copyright (c) 2005 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  ******************************************************************************/
11
12 package org.eclipse.jface.viewers;
13
14 /**
15  * <p>
16  * A content provider that expects every element to be a <code>TreeNode</code>.
17  * Most methods delegate to <code>TreeNode</code>. <code>dispose()</code>
18  * and <code>inputChanged(Viewer, Object, Object)</code> do nothing by
19  * default.
20  * </p>
21  * <p>
22  * This class and all of its methods may be overridden or extended.
23  * </p>
24  *
25  * @since 3.2
26  * @see org.eclipse.jface.viewers.TreeNode
27  */
28 public class TreeNodeContentProvider implements ITreeContentProvider {
29     /*
30      * (non-Javadoc)
31      *
32      * @see org.eclipse.jface.viewers.IContentProvider#dispose()
33      */
34     public void dispose() {
35         // Do nothing
36 }
37
38     /*
39      * (non-Javadoc)
40      *
41      * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
42      */
43     public Object JavaDoc[] getChildren(final Object JavaDoc parentElement) {
44         final TreeNode node = (TreeNode) parentElement;
45         return node.getChildren();
46     }
47
48     /*
49      * (non-Javadoc)
50      *
51      * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
52      */
53     public Object JavaDoc[] getElements(final Object JavaDoc inputElement) {
54         if (inputElement instanceof TreeNode[]) {
55             return (TreeNode[]) inputElement;
56         }
57         return new Object JavaDoc[0];
58     }
59
60     /*
61      * (non-Javadoc)
62      *
63      * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
64      */
65     public Object JavaDoc getParent(final Object JavaDoc element) {
66         final TreeNode node = (TreeNode) element;
67         return node.getParent();
68     }
69
70     /*
71      * (non-Javadoc)
72      *
73      * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
74      */
75     public boolean hasChildren(final Object JavaDoc element) {
76         final TreeNode node = (TreeNode) element;
77         return node.hasChildren();
78     }
79
80     /*
81      * (non-Javadoc)
82      *
83      * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer,
84      * java.lang.Object, java.lang.Object)
85      */
86     public void inputChanged(final Viewer viewer, final Object JavaDoc oldInput,
87             final Object JavaDoc newInput) {
88         // Do nothing
89 }
90 }
91
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