001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041: package org.netbeans.tax.event;
042:
043: import java.util.*;
044:
045: /**
046: *
047: * @author Libor Kramolis
048: * @version 0.1
049: */
050: public final class TreeEventManager {
051:
052: /** Event will never be fired out. */
053: // private static final short FIRE_NEVER = 0; // This is dangerous to cancel firing while old fire policy is not in stack
054: /** Event will be fired immediately. */
055: public static final short FIRE_NOW = 1;
056:
057: /** Event will be fired later, when state is FIRE_NOW again. */
058: public static final short FIRE_LATER = 2;
059:
060: /** Fire policy = FIRE_NEVER, FIRE_NOW or FIRE_LATER. */
061: private short firePolicy;
062:
063: /*
064: * Holds all supports that fired in fire FIRE_LATER mode.
065: */
066: private Set cachedSupports = new HashSet();
067:
068: //
069: // init
070: //
071:
072: /** Creates new TreeEventManager. */
073: public TreeEventManager(short policy) {
074: firePolicy = policy;
075: }
076:
077: /** Creates new TreeEventManager. */
078: public TreeEventManager() {
079: this (FIRE_NOW);
080: }
081:
082: /** Creates new TreeEventManager -- copy constructor. */
083: public TreeEventManager(TreeEventManager eventManager) {
084: this .firePolicy = eventManager.firePolicy;
085: }
086:
087: //
088: // itself
089: //
090:
091: /** Get fire policy.
092: * @return fire policy.
093: */
094: public final short getFirePolicy() {
095: return firePolicy;
096: }
097:
098: /** Set new fire policy.
099: * @param firePol fire policy.
100: */
101: public final/* synchronized */void setFirePolicy(short firePolicy) {
102: if (this .firePolicy == firePolicy)
103: return;
104: this .firePolicy = firePolicy;
105: if (firePolicy == FIRE_NOW)
106: fireCached();
107:
108: }
109:
110: /*
111: * Now it may fire out of order
112: */
113: private void fireCached() {
114: Iterator it = cachedSupports.iterator();
115: while (it.hasNext()) {
116: TreeEventChangeSupport next = (TreeEventChangeSupport) it
117: .next();
118: next.firePropertyChangeCache();
119: it.remove();
120: }
121: }
122:
123: /*
124: * Add passed support to cache. the cache is then fired in any order!
125: * It can be a BOTTLENECK method because it is called for every event change.
126: */
127: private void addToCache(TreeEventChangeSupport support) {
128: cachedSupports.add(support);
129: }
130:
131: /**
132: */
133: public final void firePropertyChange(
134: TreeEventChangeSupport eventChangeSupport, TreeEvent evt) {
135: // if (firePolicy == FIRE_NEVER) {
136: // eventChangeSupport.clearPropertyChangeCache();
137: // return;
138: // }
139: if (firePolicy == FIRE_NOW) {
140: eventChangeSupport.firePropertyChangeCache();
141: eventChangeSupport.firePropertyChangeNow(evt);
142: return;
143: }
144: if (firePolicy == FIRE_LATER) {
145: eventChangeSupport.firePropertyChangeLater(evt);
146: addToCache(eventChangeSupport);
147: return;
148: }
149: }
150:
151: /**
152: */
153: /* public final void runAtomicAction (Runnable runnable) {
154: // there should be a lock in runAtomicAction and fire???Change methods,
155: // but I am not so strong in multi threding and synchronization. :-(
156: if (firePolicy == FIRE_NEVER) {
157: runnable.run();
158: return;
159: }
160: // synchronized (this) {
161: short oldFirePolicy = firePolicy;
162: setFirePolicy (FIRE_LATER);
163: runnable.run();
164: setFirePolicy (oldFirePolicy);
165: // }
166: }*/
167:
168: }
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