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.spi.java.classpath.support;
042:
043: import java.beans.PropertyChangeListener;
044: import java.beans.PropertyChangeEvent;
045: import java.util.ArrayList;
046: import java.util.Iterator;
047: import org.netbeans.spi.java.classpath.PathResourceImplementation;
048:
049: /**
050: * This class provides a base class for PathResource implementations
051: * @since org.netbeans.api.java/1 1.4
052: */
053: public abstract class PathResourceBase implements
054: PathResourceImplementation {
055:
056: private ArrayList<PropertyChangeListener> pListeners;
057:
058: /**
059: * Adds property change listener.
060: * The listener is notified when the roots of the PathResource are changed.
061: * @param listener
062: */
063: public synchronized final void addPropertyChangeListener(
064: PropertyChangeListener listener) {
065: if (this .pListeners == null)
066: this .pListeners = new ArrayList<PropertyChangeListener>();
067: this .pListeners.add(listener);
068: }
069:
070: /**
071: * Removes PropertyChangeListener
072: * @param listener
073: */
074: public synchronized final void removePropertyChangeListener(
075: PropertyChangeListener listener) {
076: if (this .pListeners == null)
077: return;
078: this .pListeners.remove(listener);
079: }
080:
081: /**
082: * Fires PropertyChangeEvent
083: * @param propName name of property
084: * @param oldValue old property value or null
085: * @param newValue new property value or null
086: */
087: protected final void firePropertyChange(String propName,
088: Object oldValue, Object newValue) {
089: PropertyChangeListener[] _listeners;
090: synchronized (this ) {
091: if (this .pListeners == null)
092: return;
093: _listeners = this .pListeners
094: .toArray(new PropertyChangeListener[this .pListeners
095: .size()]);
096: }
097: PropertyChangeEvent event = new PropertyChangeEvent(this ,
098: propName, oldValue, newValue);
099: for (PropertyChangeListener l : _listeners) {
100: l.propertyChange(event);
101: }
102: }
103: }
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