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:
042: package org.netbeans.modules.project.uiapi;
043:
044: import java.beans.PropertyChangeListener;
045: import java.beans.PropertyChangeSupport;
046:
047: /**
048: * Support for listening on changes in a category's properties. Separated from
049: * API.
050: *
051: * @author Martin Krauskopf
052: */
053: public class CategoryChangeSupport {
054:
055: public static final CategoryChangeSupport NULL_INSTANCE = new CategoryChangeSupport() {
056: public void firePropertyChange(String pn, Object o, Object n) {
057: }
058:
059: public void removePropertyChangeListener(
060: PropertyChangeListener l) {
061: }
062:
063: void addPropertyChangeListener(PropertyChangeListener l) {
064: }
065: };
066:
067: private PropertyChangeSupport changeSupport;
068:
069: /** Name for the <code>valid</code> property. */
070: public static final String VALID_PROPERTY = "isCategoryValid"; // NOI18N
071:
072: /** Property for an error message of the category. */
073: public static final String ERROR_MESSAGE_PROPERTY = "categoryErrorMessage"; // NOI18N
074:
075: synchronized void addPropertyChangeListener(
076: PropertyChangeListener listener) {
077: if (listener == null) {
078: return;
079: }
080: if (changeSupport == null) {
081: changeSupport = new PropertyChangeSupport(this );
082: }
083: changeSupport.addPropertyChangeListener(listener);
084: }
085:
086: public synchronized void removePropertyChangeListener(
087: PropertyChangeListener listener) {
088: if (listener == null || changeSupport == null) {
089: return;
090: }
091: changeSupport.removePropertyChangeListener(listener);
092: }
093:
094: public void firePropertyChange(String propertyName,
095: Object oldValue, Object newValue) {
096: if (changeSupport == null
097: || (oldValue != null && newValue != null && oldValue
098: .equals(newValue))) {
099: return;
100: }
101: changeSupport.firePropertyChange(propertyName, oldValue,
102: newValue);
103: }
104:
105: }
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