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Java > Open Source Codes > org > eclipse > jface > internal > databinding > provisional > observable > list > ListDiff


1 /*******************************************************************************
2  * Copyright (c) 2006 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.internal.databinding.provisional.observable.list;
13
14 import org.eclipse.jface.internal.databinding.provisional.observable.IDiff;
15
16 /**
17  * Object describing a diff between two lists.
18  *
19  * @since 1.0
20  */
21 public abstract class ListDiff implements IDiff {
22
23     /**
24      * Returns a list of ListDiffEntry
25      *
26      * @return a list of ListDiffEntry
27      */
28     public abstract ListDiffEntry[] getDifferences();
29     
30     /**
31      * @see java.lang.Object#toString()
32      */
33     public String JavaDoc toString() {
34         ListDiffEntry[] differences = getDifferences();
35         StringBuffer JavaDoc buffer = new StringBuffer JavaDoc();
36         buffer.append(getClass().getName());
37         
38         if (differences == null || differences.length == 0) {
39             buffer
40                 .append("{}"); //$NON-NLS-1$
41 } else {
42             buffer
43                 .append("{"); //$NON-NLS-1$
44
45             for (int i = 0; i < differences.length; i++) {
46                 if (i > 0)
47                     buffer.append(", "); //$NON-NLS-1$
48
49                 buffer
50                     .append("difference[") //$NON-NLS-1$
51 .append(i)
52                     .append("] [") //$NON-NLS-1$
53 .append(differences[i] != null ? differences[i].toString() : "null") //$NON-NLS-1$
54 .append("]"); //$NON-NLS-1$
55 }
56             buffer.append("}"); //$NON-NLS-1$
57 }
58         
59         return buffer.toString();
60     }
61 }
62
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