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comparison dwtx/core/commands/contexts/ContextEvent.d @ 3:6518c18a01f7

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eclipse.core package without osgi dependencies
author Frank Benoit <benoit@tionex.de>
date Wed, 26 Mar 2008 00:57:19 +0100
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2:a012107a911c 3:6518c18a01f7
1 /*******************************************************************************
2 * Copyright (c) 2004, 2006 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 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13
14 module dwtx.core.commands.contexts.ContextEvent;
15
16 import dwtx.core.commands.contexts.Context;
17 import dwtx.core.commands.common.AbstractNamedHandleEvent;
18 import dwt.dwthelper.utils;
19
20 /**
21 * An instance of this class describes changes to an instance of
22 * <code>IContext</code>.
23 * <p>
24 * This class is not intended to be extended by clients.
25 * </p>
26 *
27 * @since 3.1
28 * @see IContextListener#contextChanged(ContextEvent)
29 */
30 public final class ContextEvent : AbstractNamedHandleEvent {
31
32 /**
33 * The bit used to represent whether the context has changed its parent.
34 */
35 private static const int CHANGED_PARENT_ID = LAST_USED_BIT << 1;
36
37 /**
38 * The context that has changed. This value is never <code>null</code>.
39 */
40 private Context context;
41
42 /**
43 * Creates a new instance of this class.
44 *
45 * @param context
46 * the instance of the interface that changed; must not be
47 * <code>null</code>.
48 * @param definedChanged
49 * <code>true</code>, iff the defined property changed.
50 * @param nameChanged
51 * <code>true</code>, iff the name property changed.
52 * @param descriptionChanged
53 * <code>true</code>, iff the description property changed.
54 * @param parentIdChanged
55 * <code>true</code>, iff the parentId property changed.
56 */
57 public this(Context context, bool definedChanged,
58 bool nameChanged, bool descriptionChanged,
59 bool parentIdChanged) {
60 super(definedChanged, descriptionChanged, nameChanged);
61
62 if (context is null) {
63 throw new NullPointerException();
64 }
65 this.context = context;
66
67 if (parentIdChanged) {
68 changedValues |= CHANGED_PARENT_ID;
69 }
70 }
71
72 /**
73 * Returns the instance of the interface that changed.
74 *
75 * @return the instance of the interface that changed. Guaranteed not to be
76 * <code>null</code>.
77 */
78 public final Context getContext() {
79 return context;
80 }
81
82 /**
83 * Returns whether or not the parentId property changed.
84 *
85 * @return <code>true</code>, iff the parentId property changed.
86 */
87 public final bool isParentIdChanged() {
88 return ((changedValues & CHANGED_PARENT_ID) !is 0);
89 }
90 }