Source Code Cross Referenced for ExtendedPropertyChangeSupport.java in  » Swing-Library » jgoodies-data-binding » com » jgoodies » binding » beans » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Swing Library » jgoodies data binding » com.jgoodies.binding.beans 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2002-2007 JGoodies Karsten Lentzsch. All Rights Reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, are permitted provided that the following conditions are met:
006:         *
007:         *  o Redistributions of source code must retain the above copyright notice,
008:         *    this list of conditions and the following disclaimer.
009:         *
010:         *  o Redistributions in binary form must reproduce the above copyright notice,
011:         *    this list of conditions and the following disclaimer in the documentation
012:         *    and/or other materials provided with the distribution.
013:         *
014:         *  o Neither the name of JGoodies Karsten Lentzsch nor the names of
015:         *    its contributors may be used to endorse or promote products derived
016:         *    from this software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
020:         * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
021:         * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
022:         * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
025:         * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
026:         * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
027:         * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
028:         * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029:         */
030:
031:        package com.jgoodies.binding.beans;
032:
033:        import java.beans.PropertyChangeEvent;
034:        import java.beans.PropertyChangeListener;
035:        import java.beans.PropertyChangeListenerProxy;
036:        import java.beans.PropertyChangeSupport;
037:
038:        /**
039:         * Differs from its superclass {@link PropertyChangeSupport} in that it can
040:         * check for changed values using <code>#equals</code> or <code>==</code>.
041:         * Useful if you want to ensure that a <code>PropertyChangeEvent</code> is fired
042:         * if the old and new value are not the same but if they are equal.<p>
043:         *
044:         * The <a href="http://java.sun.com/products/javabeans/docs/spec.html">Java
045:         * Bean Specification</a> <em>recommends</em> to not throw a
046:         * PropertyChangeEvent if the old and new value of a bound
047:         * Bean property are equal (see chapter 7.4.4). This can reduce the number
048:         * of events fired and helps avoid loops. Nevertheless a bound property
049:         * <em>may</em> fire an event if the old and new value are equal.<p>
050:         *
051:         * An example for a condition where the identity check <code>==</code>
052:         * is required and the <code>#equals</code> test fails is class
053:         * {@link com.jgoodies.binding.list.SelectionInList}. If the contained
054:         * <code>ListModel</code> changes its value, an internal listener is removed
055:         * from the old value and added to the new value. The listener must be
056:         * moved from the old instance to the new instance even if these are equal.
057:         * The <code>PropertyChangeSupport</code> doesn't fire a property change event
058:         * if such a <code>ListModel</code> is implemented as a {@link java.util.List}.
059:         * This is because instances of <code>List</code> are equal if and only if
060:         * all list members are equal and if they are in the same sequence.<p>
061:         *
062:         * This class provides two means to fire an event if the old and new
063:         * value are equal but not the same. First, you enable the identity check
064:         * in constructor {@link #ExtendedPropertyChangeSupport(Object, boolean)}.
065:         * By default all calls to <code>#firePropertyChange</code> will then
066:         * check the identity, not the equality. Second, you can invoke
067:         * {@link #firePropertyChange(PropertyChangeEvent, boolean)} or
068:         * {@link #firePropertyChange(String, Object, Object, boolean)} and
069:         * enable or disable the identity check for this call only.<p>
070:         *
071:         * TODO: (Issue #5) Use WeakReferences to refer to registered listeners.<p>
072:         *
073:         * TODO: (Issue #6) Add an optional check for valid property name
074:         * when adding a listener for a specific property.<p>
075:         *
076:         * TODO: (Issue #7) Add an optional strict check for existing
077:         * property names when firing a named property change.<p>
078:         *
079:         * TODO: (Issue #8) Add an option to ensure that update notifications
080:         * are performed in the event dispatch thread. In case a bean
081:         * is changed in a thread other than the event dispatch thread, such
082:         * a feature would help complying with Swing's single thread rule.<p>
083:         *
084:         * TODO: (Issue #11) Consider adding an option that saves update notifications
085:         * if 'checkIdentity' is true but the value types can be compared
086:         * safely via #equals, for example Strings, Booleans and Numbers.
087:         *
088:         * @author <a href="mailto:neuling@dakosy.de">Mattias Neuling</a>
089:         * @author Karsten Lentzsch
090:         * @version $Revision: 1.8 $
091:         *
092:         * @see PropertyChangeSupport
093:         * @see PropertyChangeEvent
094:         * @see PropertyChangeListener
095:         * @see Object#equals(Object)
096:         * @see java.util.List#equals(Object)
097:         */
098:        public final class ExtendedPropertyChangeSupport extends
099:                PropertyChangeSupport {
100:
101:            /**
102:             * The object to be provided as the "source" for any generated events.
103:             * @serial
104:             */
105:            private final Object source;
106:
107:            /**
108:             * The default setting for the identity check.
109:             * Can be overridden by the #firePropertyChange methods
110:             * that accept a <code>checkIdentity</code> parameter.
111:             */
112:            private final boolean checkIdentityDefault;
113:
114:            // Instance Creation ******************************************************
115:
116:            /**
117:             * Constructs an <code>ExtendedPropertyChangeSupport</code> object.
118:             *
119:             * @param sourceBean  The bean to be given as the source for any events.
120:             */
121:            public ExtendedPropertyChangeSupport(Object sourceBean) {
122:                this (sourceBean, false);
123:            }
124:
125:            /**
126:             * Constructs an <code>ExtendedPropertyChangeSupport</code> object
127:             * with the specified default test method for differences between
128:             * the old and new property values.
129:             *
130:             * @param sourceBean  The object provided as the source for any generated events.
131:             * @param checkIdentityDefault true enables the identity check by default
132:             */
133:            public ExtendedPropertyChangeSupport(Object sourceBean,
134:                    boolean checkIdentityDefault) {
135:                super (sourceBean);
136:                this .source = sourceBean;
137:                this .checkIdentityDefault = checkIdentityDefault;
138:            }
139:
140:            // Firing Events **********************************************************
141:
142:            /**
143:             * Fires the specified PropertyChangeEvent to any registered listeners.
144:             * Uses the default test (<code>#equals</code> vs. <code>==</code>)
145:             * to determine whether the event's old and new values are different.
146:             * No event is fired if old and new value are the same.
147:             *
148:             * @param evt  The PropertyChangeEvent object.
149:             *
150:             * @see PropertyChangeSupport#firePropertyChange(PropertyChangeEvent)
151:             */
152:            @Override
153:            public void firePropertyChange(PropertyChangeEvent evt) {
154:                firePropertyChange(evt, checkIdentityDefault);
155:            }
156:
157:            /**
158:             * Reports a bound property update to any registered listeners.
159:             * Uses the default test (<code>#equals</code> vs. <code>==</code>)
160:             * to determine whether the event's old and new values are different.
161:             * No event is fired if old and new value are the same.
162:             *
163:             * @param propertyName  The programmatic name of the property
164:             *      that was changed.
165:             * @param oldValue  The old value of the property.
166:             * @param newValue  The new value of the property.
167:             *
168:             * @see PropertyChangeSupport#firePropertyChange(String, Object, Object)
169:             */
170:            @Override
171:            public void firePropertyChange(String propertyName,
172:                    Object oldValue, Object newValue) {
173:                firePropertyChange(propertyName, oldValue, newValue,
174:                        checkIdentityDefault);
175:            }
176:
177:            /**
178:             * Fires an existing PropertyChangeEvent to any registered listeners.
179:             * The boolean parameter specifies whether differences between the old
180:             * and new value are tested using <code>==</code> or <code>#equals</code>.
181:             * No event is fired if old and new value are the same.
182:             *
183:             * @param evt  The PropertyChangeEvent object.
184:             * @param checkIdentity  true to check differences using <code>==</code>
185:             *     false to use <code>#equals</code>.
186:             */
187:            public void firePropertyChange(PropertyChangeEvent evt,
188:                    boolean checkIdentity) {
189:                Object oldValue = evt.getOldValue();
190:                Object newValue = evt.getNewValue();
191:                if (oldValue != null && oldValue == newValue) {
192:                    return;
193:                } else if (checkIdentity) {
194:                    fireUnchecked(evt);
195:                } else {
196:                    super .firePropertyChange(evt);
197:                }
198:            }
199:
200:            /**
201:             * Reports a bound property update to any registered listeners.
202:             * No event is fired if the old and new value are the same.
203:             * If checkIdentity is <code>true</code> an event is fired in all
204:             * other cases. If this parameter is <code>false</code>, an event is fired
205:             * if old and new values are not equal.
206:             *
207:             * @param propertyName  The programmatic name of the property
208:             *      that was changed.
209:             * @param oldValue  The old value of the property.
210:             * @param newValue  The new value of the property.
211:             * @param checkIdentity  true to check differences using <code>==</code>
212:             *     false to use <code>#equals</code>.
213:             */
214:            public void firePropertyChange(String propertyName,
215:                    Object oldValue, Object newValue, boolean checkIdentity) {
216:
217:                if (oldValue != null && oldValue == newValue) {
218:                    return;
219:                } else if (checkIdentity) {
220:                    fireUnchecked(new PropertyChangeEvent(source, propertyName,
221:                            oldValue, newValue));
222:                } else {
223:                    super .firePropertyChange(propertyName, oldValue, newValue);
224:                }
225:            }
226:
227:            /**
228:             * Fires a PropertyChangeEvent to all its listeners without checking via
229:             * equals method if the old value is equal to new value. The instance
230:             * equality check is done by the calling firePropertyChange method
231:             * (to avoid instance creation of the PropertyChangeEvent).<p>
232:             *
233:             * If some listeners have been added with a named property, then
234:             * <code>PropertyChangeSupport#getPropertyChangeListeners()</code> returns
235:             * an array with a mixture of PropertyChangeListeners
236:             * and <code>PropertyChangeListenerProxy</code>s. We notify all non-proxies
237:             * and those proxies that have a property name that is equals to the
238:             * event's property name.
239:             *
240:             * @param evt event to fire to the listeners
241:             *
242:             * @see PropertyChangeListenerProxy
243:             * @see PropertyChangeSupport#getPropertyChangeListeners()
244:             */
245:            private void fireUnchecked(PropertyChangeEvent evt) {
246:                PropertyChangeListener[] listeners;
247:                synchronized (this ) {
248:                    listeners = getPropertyChangeListeners();
249:                }
250:                String propertyName = evt.getPropertyName();
251:                for (PropertyChangeListener listener : listeners) {
252:                    if (listener instanceof  PropertyChangeListenerProxy) {
253:                        PropertyChangeListenerProxy proxy = (PropertyChangeListenerProxy) listener;
254:                        if (proxy.getPropertyName().equals(propertyName)) {
255:                            proxy.propertyChange(evt);
256:                        }
257:                    } else {
258:                        listener.propertyChange(evt);
259:                    }
260:                }
261:            }
262:
263:        }
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