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comparison org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/viewers/ViewerElementWrapper.d @ 78:0a55d2d5a946

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Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2008 Matthew Hall 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 * Matthew Hall - initial API and implementation (bug 215531)
10 ******************************************************************************/
11
12 module org.eclipse.jface.internal.databinding.viewers.ViewerElementWrapper;
13
14 import java.lang.all;
15
16 import org.eclipse.jface.viewers.IElementComparer;
17
18 /**
19 * A wrapper class for viewer elements, which uses an {@link IElementComparer}
20 * for computing {@link Object#equals(Object) equality} and
21 * {@link Object#hashCode() hashes}.
22 *
23 * @since 1.2
24 */
25 public class ViewerElementWrapper {
26 private final Object element;
27 private final IElementComparer comparer;
28
29 /**
30 * Constructs a ViewerElementWrapper wrapping the given element
31 *
32 * @param element
33 * the element being wrapped
34 * @param comparer
35 * the comparer to use for computing equality and hash codes.
36 */
37 public this(Object element, IElementComparer comparer) {
38 if (comparer is null)
39 throw new NullPointerException();
40 this.element = element;
41 this.comparer = comparer;
42 }
43
44 public bool equals(Object obj) {
45 if (!(null !is cast(ViewerElementWrapper)obj)) {
46 return false;
47 }
48 return comparer.equals(element, (cast(ViewerElementWrapper) obj).element);
49 }
50
51 public int hashCode() {
52 return comparer.hashCode(element);
53 }
54
55 Object unwrap() {
56 return element;
57 }
58 }