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Java > Open Source Codes > org > objectstyle > cayenne > graph > NodePropertyChangeOperation


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
5  *
6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
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16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
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19  * distribution.
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21  * 3. The end-user documentation included with the redistribution, if any,
22  * must include the following acknowlegement:
23  * "This product includes software developed by independent contributors
24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
30  * permission. For written permission, email
31  * "andrus at objectstyle dot org".
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33  * 5. Products derived from this software may not be called "ObjectStyle"
34  * or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
35  * names without prior written permission.
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37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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51  * This software consists of voluntary contributions made by many
52  * individuals and hosted on ObjectStyle Group web site. For more
53  * information on the ObjectStyle Group, please see
54  * <http://objectstyle.org/>.
55  */
56 package org.objectstyle.cayenne.graph;
57
58 import org.objectstyle.cayenne.util.Util;
59
60 /**
61  * @since 1.2
62  * @author Andrus Adamchik
63  */
64 class NodePropertyChangeOperation extends NodeDiff {
65
66     String JavaDoc property;
67     Object JavaDoc oldValue;
68     Object JavaDoc newValue;
69
70     NodePropertyChangeOperation(Object JavaDoc nodeId, String JavaDoc property, Object JavaDoc oldValue,
71             Object JavaDoc newValue) {
72
73         super(nodeId);
74         this.property = property;
75         this.oldValue = oldValue;
76         this.newValue = newValue;
77     }
78
79     /**
80      * Returns true if both old and new value are equal.
81      */
82     public boolean isNoop() {
83         return Util.nullSafeEquals(oldValue, newValue);
84     }
85
86     public void apply(GraphChangeHandler tracker) {
87         tracker.nodePropertyChanged(nodeId, property, oldValue, newValue);
88     }
89
90     public void undo(GraphChangeHandler tracker) {
91         tracker.nodePropertyChanged(nodeId, property, newValue, oldValue);
92     }
93 }
94
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