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comparison org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/value/ValueDiff.d @ 95:6208d4f6a277

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Added trees for databinding.beans and observable
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 10:55:51 +0200
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children b74ac5dfcc06
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94:1d37a7813832 95:6208d4f6a277
1 /*******************************************************************************
2 * Copyright (c) 2006, 2007 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.core.databinding.observable.value;
13
14 import org.eclipse.core.databinding.observable.Diffs;
15
16 /**
17 * @since 1.0
18 *
19 */
20 public abstract class ValueDiff {
21 /**
22 * Creates a value diff.
23 */
24 public this() {
25 }
26
27 /**
28 * @return the old value
29 */
30 public abstract Object getOldValue();
31
32 /**
33 * @return the new value
34 */
35 public abstract Object getNewValue();
36
37 public override equals_t opEquals(Object obj) {
38 if ( null !is cast(ValueDiff)obj ) {
39 ValueDiff val = cast(ValueDiff) obj;
40
41 return Diffs.equals(val.getNewValue(), getNewValue())
42 && Diffs.equals(val.getOldValue(), getOldValue());
43
44 }
45 return false;
46 }
47
48 public override hash_t toHash() {
49 final int prime = 31;
50 int result = 1;
51 Object nv = getNewValue();
52 Object ov = getOldValue();
53 result = prime * result + ((nv is null) ? 0 : nv.hashCode());
54 result = prime * result + ((ov is null) ? 0 : ov.hashCode());
55 return result;
56 }
57
58 /**
59 * @see java.lang.Object#toString()
60 */
61 public String toString() {
62 StringBuffer buffer = new StringBuffer();
63 buffer
64 .append(getClass().getName())
65 .append("{oldValue [") //$NON-NLS-1$
66 .append(getOldValue() !is null ? getOldValue().toString() : "null") //$NON-NLS-1$
67 .append("], newValue [") //$NON-NLS-1$
68 .append(getNewValue() !is null ? getNewValue().toString() : "null") //$NON-NLS-1$
69 .append("]}"); //$NON-NLS-1$
70
71 return buffer.toString();
72 }
73 }