01: /*
02: * This file is part of the Echo Web Application Framework (hereinafter "Echo").
03: * Copyright (C) 2002-2005 NextApp, Inc.
04: *
05: * Version: MPL 1.1/GPL 2.0/LGPL 2.1
06: *
07: * The contents of this file are subject to the Mozilla Public License Version
08: * 1.1 (the "License"); you may not use this file except in compliance with
09: * 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.update;
31:
32: import java.io.Serializable;
33:
34: /**
35: * A description of an update to a property of an object.
36: */
37: public class PropertyUpdate implements Serializable {
38:
39: private Object newValue;
40: private Object oldValue;
41:
42: /**
43: * Creates a new <code>ProeprtyUpdate</code>.
44: *
45: * @param oldValue the previous value of the property
46: * @param newValue the new value of the property
47: */
48: PropertyUpdate(Object oldValue, Object newValue) {
49: super ();
50: this .oldValue = oldValue;
51: this .newValue = newValue;
52: }
53:
54: /**
55: * Returns the new value of the property.
56: *
57: * @return the new value
58: */
59: public Object getNewValue() {
60: return newValue;
61: }
62:
63: /**
64: * Returns the previous value of the property.
65: *
66: * @return the previous value
67: */
68: public Object getOldValue() {
69: return oldValue;
70: }
71:
72: /**
73: * Display a debug representation.
74: *
75: * @see java.lang.Object#toString()
76: */
77: public String toString() {
78: return oldValue + "->" + newValue;
79: }
80: }
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