01: /*
02: * Copyright (c) 2002-2007 JGoodies Karsten Lentzsch. All Rights Reserved.
03: *
04: * Redistribution and use in source and binary forms, with or without
05: * modification, are permitted provided that the following conditions are met:
06: *
07: * o Redistributions of source code must retain the above copyright notice,
08: * this list of conditions and the following disclaimer.
09: *
10: * o Redistributions in binary form must reproduce the above copyright notice,
11: * this list of conditions and the following disclaimer in the documentation
12: * and/or other materials provided with the distribution.
13: *
14: * o Neither the name of JGoodies Karsten Lentzsch nor the names of
15: * its contributors may be used to endorse or promote products derived
16: * from this software without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20: * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
22: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
27: * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
28: * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: */
30:
31: package com.jgoodies.binding.tests.value;
32:
33: import com.jgoodies.binding.value.AbstractValueModel;
34:
35: /**
36: * A ValueModel that reports <code>null</code> as old value if the value changes.
37: *
38: * @author Karsten Lentzsch
39: * @version $Revision: 1.6 $
40: *
41: * @see ValueHolderWithNewValueNull
42: * @see ValueHolderWithOldAndNewValueNull
43: */
44: public final class ValueHolderWithOldValueNull extends
45: AbstractValueModel {
46:
47: private Object value;
48:
49: public ValueHolderWithOldValueNull(Object initialValue) {
50: value = initialValue;
51: }
52:
53: public ValueHolderWithOldValueNull(int initialValue) {
54: this (new Integer(initialValue));
55: }
56:
57: public Object getValue() {
58: return value;
59: }
60:
61: public void setValue(Object newValue) {
62: value = newValue;
63: fireValueChange(null, newValue);
64: }
65:
66: }
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