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/* java.beans.PropertyChangeSupport |
/* PropertyChangeSupport.java -- support to manage property change listeners |
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Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc. |
Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc. |
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This file is part of GNU Classpath. |
This file is part of GNU Classpath. |
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it under the terms of the GNU General Public License as published by |
it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2, or (at your option) |
the Free Software Foundation; either version 2, or (at your option) |
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any later version. |
any later version. |
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GNU Classpath is distributed in the hope that it will be useful, but |
GNU Classpath is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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package java.beans; |
package java.beans; |
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import java.util.Hashtable; |
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import java.util.Vector; |
import java.io.IOException; |
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import java.util.Enumeration; |
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import java.io.ObjectInputStream; |
import java.io.ObjectInputStream; |
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import java.io.ObjectOutputStream; |
import java.io.ObjectOutputStream; |
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import java.io.IOException; |
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import java.io.Serializable; |
import java.io.Serializable; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Hashtable; |
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import java.util.Iterator; |
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import java.util.Map.Entry; |
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import java.util.Vector; |
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/** |
/** |
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** PropertyChangeSupport makes it easy to fire property |
* PropertyChangeSupport makes it easy to fire property change events and |
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** change events and handle listeners. |
* handle listeners. It allows chaining of listeners, as well as filtering |
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** |
* by property name. In addition, it will serialize only those listeners |
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** @author John Keiser |
* which are serializable, ignoring the others without problem. This class |
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** @since JDK1.1 |
* is thread-safe. |
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** @version 1.2.0, 15 Mar 1999 |
* |
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**/ |
* @author John Keiser |
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* @author Eric Blake <ebb9@email.byu.edu> |
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public class PropertyChangeSupport implements java.io.Serializable { |
* @since 1.1 |
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transient Hashtable propertyListeners = new Hashtable(); |
* @status updated to 1.4 |
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transient Vector listeners = new Vector(); |
*/ |
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Hashtable children; |
public class PropertyChangeSupport implements Serializable |
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Object source; |
{ |
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int propertyChangeSupportSerializedDataVersion = 2; |
/** |
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private static final long serialVersionUID = 6401253773779951803L; |
* Compatible with JDK 1.1+. |
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*/ |
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/** |
private static final long serialVersionUID = 6401253773779951803L; |
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* Saves the state of the object to the stream. */ |
|
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private void writeObject(ObjectOutputStream stream) throws IOException { |
/** |
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children = propertyListeners.isEmpty() ? null : propertyListeners; |
* Maps property names (String) to named listeners (PropertyChangeSupport). |
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stream.defaultWriteObject(); |
* If this is a child instance, this field will be null. |
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for (Enumeration e = listeners.elements(); e.hasMoreElements(); ) { |
* |
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PropertyChangeListener l = (PropertyChangeListener)e.nextElement(); |
* @serial the map of property names to named listener managers |
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if (l instanceof Serializable) |
* @since 1.2 |
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stream.writeObject(l); |
*/ |
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} |
private Hashtable children; |
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stream.writeObject(null); |
|
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} |
/** |
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* The non-null source object for any generated events. |
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/** |
* |
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* Reads the object back from stream (deserialization). |
* @serial the event source |
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*/ |
*/ |
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private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException { |
private final Object source; |
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stream.defaultReadObject(); |
|
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propertyListeners = (children == null) ? new Hashtable() : children; |
/** |
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PropertyChangeListener l; |
* A field to compare serialization versions - this class uses version 2. |
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while ((l = (PropertyChangeListener)stream.readObject()) != null) { |
* |
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addPropertyChangeListener(l); |
* @serial the serialization format |
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} |
*/ |
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// FIXME: XXX: There is no spec for JDK 1.1 serialization |
private final int propertyChangeSupportSerializedDataVersion = 2; |
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// so it is unclear what to do if the value of |
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// propertyChangeSupportSerializedDataVersion is 1. |
/** |
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} |
* The list of all registered property listeners. If this instance was |
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* created by user code, this only holds the global listeners (ie. not tied |
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/** Create PropertyChangeSupport to work with a specific |
* to a name), and may be null. If it was created by this class, as a |
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** source bean. |
* helper for named properties, then this vector will be non-null, and this |
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** @param source the source bean to use. |
* instance appears as a value in the <code>children</code> hashtable of |
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**/ |
* another instance, so that the listeners are tied to the key of that |
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public PropertyChangeSupport(Object source) { |
* hashtable entry. |
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this.source = source; |
*/ |
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} |
private transient Vector listeners; |
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|
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/** Adds a PropertyChangeListener to the list of listeners. |
/** |
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** All property change events will be sent to this listener. |
* Create a PropertyChangeSupport to work with a specific source bean. |
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** <P> |
* |
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** |
* @param source the source bean to use |
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** The listener add is not unique: that is, <em>n</em> adds with |
* @throws NullPointerException if source is null |
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** the same listener will result in <em>n</em> events being sent |
*/ |
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** to that listener for every property change. |
public PropertyChangeSupport(Object source) |
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** <P> |
{ |
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** |
this.source = source; |
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** Adding a null listener will cause undefined behavior. |
if (source == null) |
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** |
throw new NullPointerException(); |
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** @param l the listener to add. |
} |
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**/ |
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public void addPropertyChangeListener(PropertyChangeListener l) { |
/** |
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listeners.addElement(l); |
* Adds a PropertyChangeListener to the list of global listeners. All |
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} |
* property change events will be sent to this listener. The listener add |
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* is not unique: that is, <em>n</em> adds with the same listener will |
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/** Adds a PropertyChangeListener listening on the specified property. |
* result in <em>n</em> events being sent to that listener for every |
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** Events will be sent to the listener for that particular property. |
* property change. Adding a null listener may cause a NullPointerException |
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** <P> |
* down the road. This method will unwrap a PropertyChangeListenerProxy, |
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** |
* registering the underlying delegate to the named property list. |
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** The listener add is not unique; that is, <em>n</em> adds on a |
* |
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** particular property for a particular listener will result in |
* @param l the listener to add |
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** <em>n</em> events being sent to that listener when that |
*/ |
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** property is changed. |
public synchronized void addPropertyChangeListener(PropertyChangeListener l) |
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** <P> |
{ |
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** |
if (l instanceof PropertyChangeListenerProxy) |
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** The effect is cumulative, too; if you are registered to listen |
{ |
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** to receive events on all property changes, and then you |
PropertyChangeListenerProxy p = (PropertyChangeListenerProxy) l; |
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** register on a particular property, you will receive change |
addPropertyChangeListener(p.propertyName, |
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** events for that property twice. |
(PropertyChangeListener) p.getListener()); |
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** <P> |
} |
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** |
else |
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** Adding a null listener will cause undefined behavior. |
{ |
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** |
if (listeners == null) |
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** @param propertyName the name of the property to listen on. |
listeners = new Vector(); |
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** @param l the listener to add. |
listeners.add(l); |
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**/ |
} |
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public void addPropertyChangeListener(String propertyName, PropertyChangeListener l) { |
} |
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synchronized(propertyListeners) { |
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Vector v = (Vector)propertyListeners.get(propertyName); |
/** |
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try { |
* Removes a PropertyChangeListener from the list of global listeners. If |
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v.addElement(l); |
* any specific properties are being listened on, they must be deregistered |
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} catch(NullPointerException e) { |
* by themselves; this will only remove the general listener to all |
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/* If v is not found, create a new vector. */ |
* properties. If <code>add()</code> has been called multiple times for a |
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v = new Vector(); |
* particular listener, <code>remove()</code> will have to be called the |
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v.addElement(l); |
* same number of times to deregister it. This method will unwrap a |
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propertyListeners.put(propertyName, v); |
* PropertyChangeListenerProxy, removing the underlying delegate from the |
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} |
* named property list. |
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} |
* |
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} |
* @param l the listener to remove |
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|
*/ |
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/** Removes a PropertyChangeListener from the list of listeners. |
public synchronized void |
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** If any specific properties are being listened on, they must |
removePropertyChangeListener(PropertyChangeListener l) |
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** be deregistered by themselves; this will only remove the |
{ |
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** general listener to all properties. |
if (l instanceof PropertyChangeListenerProxy) |
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** <P> |
{ |
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** |
PropertyChangeListenerProxy p = (PropertyChangeListenerProxy) l; |
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** If <code>add()</code> has been called multiple times for a |
removePropertyChangeListener(p.propertyName, |
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** particular listener, <code>remove()</code> will have to be |
(PropertyChangeListener) p.getListener()); |
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** called the same number of times to deregister it. |
} |
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** |
else if (listeners != null) |
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** @param l the listener to remove. |
{ |
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**/ |
listeners.remove(l); |
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public void removePropertyChangeListener(PropertyChangeListener l) { |
if (listeners.isEmpty()) |
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listeners.removeElement(l); |
listeners = null; |
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} |
} |
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} |
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/** Removes a PropertyChangeListener from listening to a specific property. |
|
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** <P> |
/** |
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** |
* Returns an array of all registered property change listeners. Those that |
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** If <code>add()</code> has been called multiple times for a |
* were registered under a name will be wrapped in a |
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** particular listener on a property, <code>remove()</code> will |
* <code>PropertyChangeListenerProxy</code>, so you must check whether the |
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** have to be called the same number of times to deregister it. |
* listener is an instance of the proxy class in order to see what name the |
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** |
* real listener is registered under. If there are no registered listeners, |
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** @param propertyName the property to stop listening on. |
* this returns an empty array. |
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** @param l the listener to remove. |
* |
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**/ |
* @return the array of registered listeners |
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public void removePropertyChangeListener(String propertyName, PropertyChangeListener l) { |
* @see PropertyChangeListenerProxy |
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synchronized(propertyListeners) { |
* @since 1.4 |
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Vector v = (Vector)propertyListeners.get(propertyName); |
*/ |
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try { |
public synchronized PropertyChangeListener[] getPropertyChangeListeners() |
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v.removeElement(l); |
{ |
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if(v.size() == 0) { |
ArrayList list = new ArrayList(); |
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propertyListeners.remove(propertyName); |
if (listeners != null) |
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} |
list.addAll(listeners); |
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} catch(NullPointerException e) { |
if (children != null) |
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/* if v is not found, do nothing. */ |
{ |
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} |
int i = children.size(); |
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} |
Iterator iter = children.entrySet().iterator(); |
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} |
while (--i >= 0) |
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|
{ |
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/** Fire a PropertyChangeEvent to all the listeners. |
Entry e = (Entry) iter.next(); |
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** |
String name = (String) e.getKey(); |
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** @param event the event to fire. |
Vector v = ((PropertyChangeSupport) e.getValue()).listeners; |
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**/ |
int j = v.size(); |
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public void firePropertyChange(PropertyChangeEvent event) { |
while (--j >= 0) |
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for(int i=0;i<listeners.size();i++) { |
list.add(new PropertyChangeListenerProxy |
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((PropertyChangeListener)listeners.elementAt(i)).propertyChange(event); |
(name, (PropertyChangeListener) v.get(j))); |
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} |
} |
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Vector moreListeners = (Vector)propertyListeners.get(event.getPropertyName()); |
} |
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if(moreListeners != null) { |
return (PropertyChangeListener[]) |
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for(int i=0;i<moreListeners.size();i++) { |
list.toArray(new PropertyChangeListener[list.size()]); |
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((PropertyChangeListener)moreListeners.elementAt(i)).propertyChange(event); |
} |
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} |
|
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} |
/** |
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} |
* Adds a PropertyChangeListener listening on the specified property. Events |
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|
* will be sent to the listener only if the property name matches. The |
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/** Fire a PropertyChangeEvent containing the old and new values of the property to all the listeners. |
* listener add is not unique; that is, <em>n</em> adds on a particular |
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** |
* property for a particular listener will result in <em>n</em> events |
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** @param propertyName the name of the property that changed. |
* being sent to that listener when that property is changed. The effect is |
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** @param oldVal the old value. |
* cumulative, too; if you are registered to listen to receive events on |
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** @param newVal the new value. |
* all property changes, and then you register on a particular property, |
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**/ |
* you will receive change events for that property twice. Adding a null |
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public void firePropertyChange(String propertyName, Object oldVal, Object newVal) { |
* listener may cause a NullPointerException down the road. This method |
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firePropertyChange(new PropertyChangeEvent(source,propertyName,oldVal,newVal)); |
* will unwrap a PropertyChangeListenerProxy, registering the underlying |
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} |
* delegate to the named property list if the names match, and discarding |
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* it otherwise. |
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/** Fire a PropertyChangeEvent containing the old and new values of the property to all the listeners. |
* |
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** |
* @param propertyName the name of the property to listen on |
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** @param propertyName the name of the property that changed. |
* @param l the listener to add |
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** @param oldVal the old value. |
* @throws NullPointerException if propertyName is null |
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** @param newVal the new value. |
*/ |
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**/ |
public synchronized void addPropertyChangeListener(String propertyName, |
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public void firePropertyChange(String propertyName, boolean oldVal, boolean newVal) { |
PropertyChangeListener l) |
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firePropertyChange(new PropertyChangeEvent(source, propertyName, new Boolean(oldVal), new Boolean(newVal))); |
{ |
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} |
while (l instanceof PropertyChangeListenerProxy) |
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|
{ |
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/** Fire a PropertyChangeEvent containing the old and new values of the property to all the listeners. |
PropertyChangeListenerProxy p = (PropertyChangeListenerProxy) l; |
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** |
if (propertyName == null ? p.propertyName != null |
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** @param propertyName the name of the property that changed. |
: ! propertyName.equals(p.propertyName)) |
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** @param oldVal the old value. |
return; |
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** @param newVal the new value. |
l = (PropertyChangeListener) p.getListener(); |
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**/ |
} |
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public void firePropertyChange(String propertyName, int oldVal, int newVal) { |
PropertyChangeSupport s = null; |
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firePropertyChange(new PropertyChangeEvent(source, propertyName, new Integer(oldVal), new Integer(newVal))); |
if (children == null) |
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} |
children = new Hashtable(); |
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|
else |
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/** Tell whether the specified property is being listened on or not. |
s = (PropertyChangeSupport) children.get(propertyName); |
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** This will only return <code>true</code> if there are listeners |
if (s == null) |
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** on all properties or if there is a listener specifically on this |
{ |
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** property. |
s = new PropertyChangeSupport(source); |
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** |
s.listeners = new Vector(); |
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** @param propertyName the property that may be listened on |
children.put(propertyName, s); |
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** @return whether the property is being listened on |
} |
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**/ |
s.listeners.add(l); |
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public boolean hasListeners(String propertyName) { |
} |
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return listeners.size() > 0 || propertyListeners.get(propertyName) != null; |
|
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} |
/** |
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} |
* Removes a PropertyChangeListener from listening to a specific property. |
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* If <code>add()</code> has been called multiple times for a particular |
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* listener on a property, <code>remove()</code> will have to be called the |
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* same number of times to deregister it. This method will unwrap a |
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* PropertyChangeListenerProxy, removing the underlying delegate from the |
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* named property list if the names match. |
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* |
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* @param propertyName the property to stop listening on |
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* @param l the listener to remove |
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* @throws NullPointerException if propertyName is null |
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*/ |
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public synchronized void |
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removePropertyChangeListener(String propertyName, PropertyChangeListener l) |
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{ |
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if (children == null) |
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return; |
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PropertyChangeSupport s |
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= (PropertyChangeSupport) children.get(propertyName); |
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if (s == null) |
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return; |
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while (l instanceof PropertyChangeListenerProxy) |
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{ |
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PropertyChangeListenerProxy p = (PropertyChangeListenerProxy) l; |
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if (propertyName == null ? p.propertyName != null |
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: ! propertyName.equals(p.propertyName)) |
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return; |
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l = (PropertyChangeListener) p.getListener(); |
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} |
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s.listeners.remove(l); |
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if (s.listeners.isEmpty()) |
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{ |
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children.remove(propertyName); |
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if (children.isEmpty()) |
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children = null; |
288 |
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} |
289 |
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} |
290 |
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|
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/** |
292 |
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* Returns an array of all property change listeners registered under the |
293 |
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* given property name. If there are no registered listeners, this returns |
294 |
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* an empty array. |
295 |
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* |
296 |
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* @return the array of registered listeners |
297 |
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* @throws NullPointerException if propertyName is null |
298 |
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* @since 1.4 |
299 |
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*/ |
300 |
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public synchronized PropertyChangeListener[] |
301 |
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getPropertyChangeListeners(String propertyName) |
302 |
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{ |
303 |
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if (children == null) |
304 |
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return new PropertyChangeListener[0]; |
305 |
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PropertyChangeSupport s |
306 |
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= (PropertyChangeSupport) children.get(propertyName); |
307 |
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if (s == null) |
308 |
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return new PropertyChangeListener[0]; |
309 |
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return (PropertyChangeListener[]) |
310 |
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s.listeners.toArray(new PropertyChangeListener[s.listeners.size()]); |
311 |
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} |
312 |
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|
313 |
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/** |
314 |
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* Fire a PropertyChangeEvent containing the old and new values of the |
315 |
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* property to all the global listeners, and to all the listeners for the |
316 |
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* specified property name. This does nothing if old and new are non-null |
317 |
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* and equal. |
318 |
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* |
319 |
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* @param propertyName the name of the property that changed |
320 |
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* @param oldVal the old value |
321 |
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* @param newVal the new value |
322 |
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*/ |
323 |
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public void firePropertyChange(String propertyName, |
324 |
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Object oldVal, Object newVal) |
325 |
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{ |
326 |
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firePropertyChange(new PropertyChangeEvent(source, propertyName, |
327 |
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oldVal, newVal)); |
328 |
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} |
329 |
|
|
330 |
|
/** |
331 |
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* Fire a PropertyChangeEvent containing the old and new values of the |
332 |
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* property to all the global listeners, and to all the listeners for the |
333 |
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* specified property name. This does nothing if old and new are equal. |
334 |
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* |
335 |
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* @param propertyName the name of the property that changed |
336 |
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* @param oldVal the old value |
337 |
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* @param newVal the new value |
338 |
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*/ |
339 |
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public void firePropertyChange(String propertyName, int oldVal, int newVal) |
340 |
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{ |
341 |
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if (oldVal != newVal) |
342 |
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firePropertyChange(new PropertyChangeEvent(source, propertyName, |
343 |
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new Integer(oldVal), |
344 |
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new Integer(newVal))); |
345 |
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} |
346 |
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|
347 |
|
/** |
348 |
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* Fire a PropertyChangeEvent containing the old and new values of the |
349 |
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* property to all the global listeners, and to all the listeners for the |
350 |
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* specified property name. This does nothing if old and new are equal. |
351 |
|
* |
352 |
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* @param propertyName the name of the property that changed |
353 |
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* @param oldVal the old value |
354 |
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* @param newVal the new value |
355 |
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*/ |
356 |
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public void firePropertyChange(String propertyName, |
357 |
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boolean oldVal, boolean newVal) |
358 |
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{ |
359 |
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if (oldVal != newVal) |
360 |
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firePropertyChange(new PropertyChangeEvent(source, propertyName, |
361 |
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Boolean.valueOf(oldVal), |
362 |
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Boolean.valueOf(newVal))); |
363 |
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} |
364 |
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|
365 |
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/** |
366 |
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* Fire a PropertyChangeEvent to all the global listeners, and to all the |
367 |
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* listeners for the specified property name. This does nothing if old and |
368 |
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* new values of the event are equal. |
369 |
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* |
370 |
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* @param event the event to fire |
371 |
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* @throws NullPointerException if event is null |
372 |
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*/ |
373 |
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public void firePropertyChange(PropertyChangeEvent event) |
374 |
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{ |
375 |
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if (event.oldValue != null && event.oldValue.equals(event.newValue)) |
376 |
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return; |
377 |
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Vector v = listeners; // Be thread-safe. |
378 |
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if (v != null) |
379 |
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{ |
380 |
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int i = v.size(); |
381 |
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while (--i >= 0) |
382 |
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((PropertyChangeListener) v.get(i)).propertyChange(event); |
383 |
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} |
384 |
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Hashtable h = children; // Be thread-safe. |
385 |
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if (h != null && event.propertyName != null) |
386 |
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{ |
387 |
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PropertyChangeSupport s |
388 |
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= (PropertyChangeSupport) h.get(event.propertyName); |
389 |
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if (s != null) |
390 |
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{ |
391 |
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v = s.listeners; // Be thread-safe. |
392 |
|
int i = v == null ? 0 : v.size(); |
393 |
|
while (--i >= 0) |
394 |
|
((PropertyChangeListener) v.get(i)).propertyChange(event); |
395 |
|
} |
396 |
|
} |
397 |
|
} |
398 |
|
|
399 |
|
/** |
400 |
|
* Tell whether the specified property is being listened on or not. This |
401 |
|
* will only return <code>true</code> if there are listeners on all |
402 |
|
* properties or if there is a listener specifically on this property. |
403 |
|
* |
404 |
|
* @param propertyName the property that may be listened on |
405 |
|
* @return whether the property is being listened on |
406 |
|
* @throws NullPointerException if propertyName is null |
407 |
|
*/ |
408 |
|
public synchronized boolean hasListeners(String propertyName) |
409 |
|
{ |
410 |
|
return listeners != null || (children != null |
411 |
|
&& children.get(propertyName) != null); |
412 |
|
} |
413 |
|
|
414 |
|
/** |
415 |
|
* Saves the state of the object to the stream. |
416 |
|
* |
417 |
|
* @param s the stream to write to |
418 |
|
* @throws IOException if anything goes wrong |
419 |
|
* @serialData this writes out a null-terminated list of serializable |
420 |
|
* global property change listeners (the listeners for a named |
421 |
|
* property are written out as the global listeners of the |
422 |
|
* children, when the children hashtable is saved) |
423 |
|
*/ |
424 |
|
private synchronized void writeObject(ObjectOutputStream s) |
425 |
|
throws IOException |
426 |
|
{ |
427 |
|
s.defaultWriteObject(); |
428 |
|
if (listeners != null) |
429 |
|
{ |
430 |
|
int i = listeners.size(); |
431 |
|
while (--i >= 0) |
432 |
|
if (listeners.get(i) instanceof Serializable) |
433 |
|
s.writeObject(listeners.get(i)); |
434 |
|
} |
435 |
|
s.writeObject(null); |
436 |
|
} |
437 |
|
|
438 |
|
/** |
439 |
|
* Reads the object back from stream (deserialization). |
440 |
|
* |
441 |
|
* XXX Since serialization for 1.1 streams was not documented, this may |
442 |
|
* not work if propertyChangeSupportSerializedDataVersion is 1. |
443 |
|
* |
444 |
|
* @param s the stream to read from |
445 |
|
* @throws IOException if reading the stream fails |
446 |
|
* @throws ClassNotFoundException if deserialization fails |
447 |
|
* @serialData this reads in a null-terminated list of serializable |
448 |
|
* global property change listeners (the listeners for a named |
449 |
|
* property are written out as the global listeners of the |
450 |
|
* children, when the children hashtable is saved) |
451 |
|
*/ |
452 |
|
private void readObject(ObjectInputStream s) |
453 |
|
throws IOException, ClassNotFoundException |
454 |
|
{ |
455 |
|
s.defaultReadObject(); |
456 |
|
PropertyChangeListener l = (PropertyChangeListener) s.readObject(); |
457 |
|
while (l != null) |
458 |
|
{ |
459 |
|
addPropertyChangeListener(l); |
460 |
|
l = (PropertyChangeListener) s.readObject(); |
461 |
|
} |
462 |
|
// Sun is not as careful with children as we are, and lets some proxys |
463 |
|
// in that can never receive events. So, we clean up anything that got |
464 |
|
// serialized, to make sure our invariants hold. |
465 |
|
if (children != null) |
466 |
|
{ |
467 |
|
int i = children.size(); |
468 |
|
Iterator iter = children.entrySet().iterator(); |
469 |
|
while (--i >= 0) |
470 |
|
{ |
471 |
|
Entry e = (Entry) iter.next(); |
472 |
|
String name = (String) e.getKey(); |
473 |
|
PropertyChangeSupport pcs = (PropertyChangeSupport) e.getValue(); |
474 |
|
if (pcs.listeners == null) |
475 |
|
pcs.listeners = new Vector(); |
476 |
|
if (pcs.children != null) |
477 |
|
pcs.listeners.addAll |
478 |
|
(Arrays.asList(pcs.getPropertyChangeListeners(name))); |
479 |
|
if (pcs.listeners.size() == 0) |
480 |
|
iter.remove(); |
481 |
|
else |
482 |
|
pcs.children = null; |
483 |
|
} |
484 |
|
if (children.size() == 0) |
485 |
|
children = null; |
486 |
|
} |
487 |
|
} |
488 |
|
} // class PropertyChangeSupport |