Mercurial > projects > dwt-addons

annotate dwtx/core/runtime/ListenerList.d @ 3:6518c18a01f7

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
eclipse.core package without osgi dependencies
author Frank Benoit <benoit@tionex.de>
date Wed, 26 Mar 2008 00:57:19 +0100
parents
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
1 /*******************************************************************************
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
2 * Copyright (c) 2004, 2006 IBM Corporation and others.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
3 * All rights reserved. This program and the accompanying materials
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
4 * are made available under the terms of the Eclipse Public License v1.0
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
5 * which accompanies this distribution, and is available at
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
6 * http://www.eclipse.org/legal/epl-v10.html
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
7 *
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
8 * Contributors:
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
9 * IBM Corporation - initial API and implementation
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
10 * Port to the D programming language:
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
11 * Frank Benoit <benoit@tionex.de>
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
12 *******************************************************************************/
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
13 module dwtx.core.runtime.ListenerList;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
14
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
15 import dwt.dwthelper.utils;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
16
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
17 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
18 * This class is a thread safe list that is designed for storing lists of listeners.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
19 * The implementation is optimized for minimal memory footprint, frequent reads
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
20 * and infrequent writes. Modification of the list is synchronized and relatively
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
21 * expensive, while accessing the listeners is very fast. Readers are given access
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
22 * to the underlying array data structure for reading, with the trust that they will
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
23 * not modify the underlying array.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
24 * <p>
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
25 * <a name="same">A listener list handles the <i>same</i> listener being added
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
26 * multiple times, and tolerates removal of listeners that are the same as other
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
27 * listeners in the list. For this purpose, listeners can be compared with each other
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
28 * using either equality or identity, as specified in the list constructor.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
29 * </p>
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
30 * <p>
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
31 * Use the <code>getListeners</code> method when notifying listeners. The recommended
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
32 * code sequence for notifying all registered listeners of say,
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
33 * <code>FooListener.eventHappened</code>, is:
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
34 *
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
35 * <pre>
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
36 * Object[] listeners = myListenerList.getListeners();
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
37 * for (int i = 0; i &lt; listeners.length; ++i) {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
38 * ((FooListener) listeners[i]).eventHappened(event);
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
39 * }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
40 * </pre>
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
41 *
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
42 * </p><p>
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
43 * This class can be used without OSGi running.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
44 * </p>
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
45 * @since dwtx.equinox.common 3.2
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
46 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
47 public class ListenerList {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
48
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
49 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
50 * The empty array singleton instance.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
51 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
52 private static const Object[] EmptyArray;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
53
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
54 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
55 * Mode constant (value 0) indicating that listeners should be considered
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
56 * the <a href="#same">same</a> if they are equal.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
57 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
58 public static const int EQUALITY = 0;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
59
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
60 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
61 * Mode constant (value 1) indicating that listeners should be considered
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
62 * the <a href="#same">same</a> if they are identical.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
63 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
64 public static const int IDENTITY = 1;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
65
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
66 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
67 * Indicates the comparison mode used to determine if two
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
68 * listeners are equivalent
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
69 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
70 private final bool identity;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
71
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
72 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
73 * The list of listeners. Initially empty but initialized
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
74 * to an array of size capacity the first time a listener is added.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
75 * Maintains invariant: listeners !is null
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
76 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
77 private Object[] listeners;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
78
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
79 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
80 * Creates a listener list in which listeners are compared using equality.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
81 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
82 public this() {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
83 this(EQUALITY);
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
84 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
85
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
86 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
87 * Creates a listener list using the provided comparison mode.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
88 *
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
89 * @param mode The mode used to determine if listeners are the <a href="#same">same</a>.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
90 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
91 public this(int mode) {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
92 if (mode !is EQUALITY && mode !is IDENTITY)
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
93 throw new IllegalArgumentException( null );
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
94 this.identity = mode is IDENTITY;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
95 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
96
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
97 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
98 * Adds a listener to this list. This method has no effect if the <a href="#same">same</a>
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
99 * listener is already registered.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
100 *
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
101 * @param listener the non-<code>null</code> listener to add
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
102 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
103 public synchronized void add(Object listener) {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
104 // This method is synchronized to protect against multiple threads adding
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
105 // or removing listeners concurrently. This does not block concurrent readers.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
106 if (listener is null)
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
107 throw new IllegalArgumentException( null );
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
108 // check for duplicates
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
109 final int oldSize = listeners.length;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
110 for (int i = 0; i < oldSize; ++i) {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
111 Object listener2 = listeners[i];
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
112 if (identity ? listener is listener2 : listener.opEquals(listener2))
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
113 return;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
114 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
115 // Thread safety: create new array to avoid affecting concurrent readers
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
116 Object[] newListeners = new Object[oldSize + 1];
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
117 System.arraycopy(listeners, 0, newListeners, 0, oldSize);
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
118 newListeners[oldSize] = listener;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
119 //atomic assignment
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
120 this.listeners = newListeners;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
121 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
122
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
123 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
124 * Returns an array containing all the registered listeners.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
125 * The resulting array is unaffected by subsequent adds or removes.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
126 * If there are no listeners registered, the result is an empty array.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
127 * Use this method when notifying listeners, so that any modifications
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
128 * to the listener list during the notification will have no effect on
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
129 * the notification itself.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
130 * <p>
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
131 * Note: Callers of this method <b>must not</b> modify the returned array.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
132 *
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
133 * @return the list of registered listeners
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
134 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
135 public Object[] getListeners() {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
136 return listeners;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
137 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
138
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
139 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
140 * Returns whether this listener list is empty.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
141 *
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
142 * @return <code>true</code> if there are no registered listeners, and
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
143 * <code>false</code> otherwise
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
144 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
145 public bool isEmpty() {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
146 return listeners.length is 0;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
147 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
148
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
149 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
150 * Removes a listener from this list. Has no effect if the <a href="#same">same</a>
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
151 * listener was not already registered.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
152 *
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
153 * @param listener the non-<code>null</code> listener to remove
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
154 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
155 public synchronized void remove(Object listener) {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
156 // This method is synchronized to protect against multiple threads adding
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
157 // or removing listeners concurrently. This does not block concurrent readers.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
158 if (listener is null)
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
159 throw new IllegalArgumentException( null );
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
160 int oldSize = listeners.length;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
161 for (int i = 0; i < oldSize; ++i) {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
162 Object listener2 = listeners[i];
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
163 if (identity ? listener is listener2 : listener.opEquals(listener2)) {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
164 if (oldSize is 1) {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
165 listeners = EmptyArray;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
166 } else {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
167 // Thread safety: create new array to avoid affecting concurrent readers
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
168 Object[] newListeners = new Object[oldSize - 1];
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
169 System.arraycopy(listeners, 0, newListeners, 0, i);
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
170 System.arraycopy(listeners, i + 1, newListeners, i, oldSize - i - 1);
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
171 //atomic assignment to field
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
172 this.listeners = newListeners;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
173 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
174 return;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
175 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
176 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
177 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
178
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
179 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
180 * Returns the number of registered listeners.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
181 *
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
182 * @return the number of registered listeners
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
183 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
184 public int size() {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
185 return listeners.length;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
186 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
187
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
188 /**
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
189 * Removes all listeners from this list.
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
190 */
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
191 public synchronized void clear() {
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
192 listeners = EmptyArray;
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
193 }
6518c18a01f7 eclipse.core package without osgi dependencies
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
194 }