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Diffstat (limited to 'libjava/java/beans/PropertyChangeSupport.java')
-rw-r--r-- | libjava/java/beans/PropertyChangeSupport.java | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/libjava/java/beans/PropertyChangeSupport.java b/libjava/java/beans/PropertyChangeSupport.java deleted file mode 100644 index 512c8edeb7d..00000000000 --- a/libjava/java/beans/PropertyChangeSupport.java +++ /dev/null @@ -1,203 +0,0 @@ -/* java.beans.PropertyChangeSupport - Copyright (C) 1998, 1999 Free Software Foundation, Inc. - -This file is part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU Classpath is distributed in the hope that it will be useful, but -WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -General Public License for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; see the file COPYING. If not, write to the -Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA -02111-1307 USA. - -As a special exception, if you link this library with other files to -produce an executable, this library does not by itself cause the -resulting executable to be covered by the GNU General Public License. -This exception does not however invalidate any other reasons why the -executable file might be covered by the GNU General Public License. */ - - -package java.beans; -import java.util.Hashtable; -import java.util.Vector; - -/** - ** PropertyChangeSupport makes it easy to fire property - ** change events and handle listeners. - ** - ** @author John Keiser - ** @since JDK1.1 - ** @version 1.2.0, 15 Mar 1999 - **/ - -public class PropertyChangeSupport implements java.io.Serializable { - Hashtable propertyListeners = new Hashtable(); - Vector listeners = new Vector(); - Object bean; - - /** Create PropertyChangeSupport to work with a specific - ** source bean. - ** @param bean the source bean to use. - **/ - public PropertyChangeSupport(Object bean) { - this.bean = bean; - } - - /** Adds a PropertyChangeListener to the list of listeners. - ** All property change events will be sent to this listener. - ** <P> - ** - ** The listener add is not unique: that is, <em>n</em> adds with - ** the same listener will result in <em>n</em> events being sent - ** to that listener for every property change. - ** <P> - ** - ** Adding a null listener will cause undefined behavior. - ** - ** @param l the listener to add. - **/ - public void addPropertyChangeListener(PropertyChangeListener l) { - listeners.addElement(l); - } - - /** Adds a PropertyChangeListener listening on the specified property. - ** Events will be sent to the listener for that particular property. - ** <P> - ** - ** The listener add is not unique; that is, <em>n</em> adds on a - ** particular property for a particular listener will result in - ** <em>n</em> events being sent to that listener when that - ** property is changed. - ** <P> - ** - ** The effect is cumulative, too; if you are registered to listen - ** to receive events on all property changes, and then you - ** register on a particular property, you will receive change - ** events for that property twice. - ** <P> - ** - ** Adding a null listener will cause undefined behavior. - ** - ** @param propertyName the name of the property to listen on. - ** @param l the listener to add. - **/ - public void addPropertyChangeListener(String propertyName, PropertyChangeListener l) { - synchronized(propertyListeners) { - Vector v = (Vector)propertyListeners.get(propertyName); - try { - v.addElement(l); - } catch(NullPointerException e) { - /* If v is not found, create a new vector. */ - v = new Vector(); - v.addElement(l); - propertyListeners.put(propertyName, v); - } - } - } - - /** Removes a PropertyChangeListener from the list of listeners. - ** If any specific properties are being listened on, they must - ** be deregistered by themselves; this will only remove the - ** general listener to all properties. - ** <P> - ** - ** If <code>add()</code> has been called multiple times for a - ** particular listener, <code>remove()</code> will have to be - ** called the same number of times to deregister it. - ** - ** @param l the listener to remove. - **/ - public void removePropertyChangeListener(PropertyChangeListener l) { - listeners.removeElement(l); - } - - /** Removes a PropertyChangeListener from listening to a specific property. - ** <P> - ** - ** If <code>add()</code> has been called multiple times for a - ** particular listener on a property, <code>remove()</code> will - ** have to be called the same number of times to deregister it. - ** - ** @param propertyName the property to stop listening on. - ** @param l the listener to remove. - **/ - public void removePropertyChangeListener(String propertyName, PropertyChangeListener l) { - synchronized(propertyListeners) { - Vector v = (Vector)propertyListeners.get(propertyName); - try { - v.removeElement(l); - if(v.size() == 0) { - propertyListeners.remove(propertyName); - } - } catch(NullPointerException e) { - /* if v is not found, do nothing. */ - } - } - } - - /** Fire a PropertyChangeEvent to all the listeners. - ** - ** @param event the event to fire. - **/ - public void firePropertyChange(PropertyChangeEvent event) { - for(int i=0;i<listeners.size();i++) { - ((PropertyChangeListener)listeners.elementAt(i)).propertyChange(event); - } - Vector moreListeners = (Vector)propertyListeners.get(event.getPropertyName()); - if(moreListeners != null) { - for(int i=0;i<moreListeners.size();i++) { - ((PropertyChangeListener)moreListeners.elementAt(i)).propertyChange(event); - } - } - } - - /** Fire a PropertyChangeEvent containing the old and new values of the property to all the listeners. - ** - ** @param propertyName the name of the property that changed. - ** @param oldVal the old value. - ** @param newVal the new value. - **/ - public void firePropertyChange(String propertyName, Object oldVal, Object newVal) { - firePropertyChange(new PropertyChangeEvent(bean,propertyName,oldVal,newVal)); - } - - /** Fire a PropertyChangeEvent containing the old and new values of the property to all the listeners. - ** - ** @param propertyName the name of the property that changed. - ** @param oldVal the old value. - ** @param newVal the new value. - **/ - public void firePropertyChange(String propertyName, boolean oldVal, boolean newVal) { - firePropertyChange(new PropertyChangeEvent(bean, propertyName, new Boolean(oldVal), new Boolean(newVal))); - } - - /** Fire a PropertyChangeEvent containing the old and new values of the property to all the listeners. - ** - ** @param propertyName the name of the property that changed. - ** @param oldVal the old value. - ** @param newVal the new value. - **/ - public void firePropertyChange(String propertyName, int oldVal, int newVal) { - firePropertyChange(new PropertyChangeEvent(bean, propertyName, new Integer(oldVal), new Integer(newVal))); - } - - /** Tell whether the specified property is being listened on or not. - ** This will only return <code>true</code> if there are listeners - ** on all properties or if there is a listener specifically on this - ** property. - ** - ** @param propertyName the property that may be listened on - ** @return whether the property is being listened on - **/ - public boolean hasListeners(String propertyName) { - return listeners.size() > 0 || propertyListeners.get(propertyName) != null; - } -} |