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Diffstat (limited to 'libjava/java/beans/VetoableChangeSupport.java')
-rw-r--r-- | libjava/java/beans/VetoableChangeSupport.java | 245 |
1 files changed, 0 insertions, 245 deletions
diff --git a/libjava/java/beans/VetoableChangeSupport.java b/libjava/java/beans/VetoableChangeSupport.java deleted file mode 100644 index 6d0ff0c0acb..00000000000 --- a/libjava/java/beans/VetoableChangeSupport.java +++ /dev/null @@ -1,245 +0,0 @@ -/* - * java.beans.VetoableChangeSupport: part of the Java Class Libraries project. - * Copyright (C) 1998 Free Software Foundation - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library 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 - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 02111-1307, USA. - */ - -package java.beans; -import java.util.Hashtable; -import java.util.Vector; - -/** - ** VetoableChangeSupport makes it easy to fire vetoable - ** change events and handle listeners as well as reversion - ** of old values when things go wrong. - ** - ** @author John Keiser - ** @since JDK1.1 - ** @version 1.2.0, 15 Mar 1998 - **/ - -public class VetoableChangeSupport implements java.io.Serializable { - Hashtable propertyListeners = new Hashtable(); - Vector listeners = new Vector(); - Object bean; - - /** Create VetoableChangeSupport to work with a specific - ** source bean. - ** @param bean the source bean to use. - **/ - public VetoableChangeSupport(Object bean) { - this.bean = bean; - } - - /** Adds a VetoableChangeListener 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 addVetoableChangeListener(VetoableChangeListener l) { - listeners.addElement(l); - } - - /** Adds a VetoableChangeListener 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 addVetoableChangeListener(String propertyName, VetoableChangeListener 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 VetoableChangeListener 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 removeVetoableChangeListener(VetoableChangeListener l) { - listeners.removeElement(l); - } - - /** Removes a VetoableChangeListener 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 removeVetoableChangeListener(String propertyName, VetoableChangeListener 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 VetoableChangeEvent to all the listeners. - ** If any listener objects, a reversion event will be sent to - ** those listeners who received the initial event. - ** - ** @param proposedChange the event to send. - ** @exception PropertyVetoException if the change is vetoed. - **/ - public void fireVetoableChange(PropertyChangeEvent proposedChange) throws PropertyVetoException { - int currentListener=0; - try { - for(;currentListener<listeners.size();currentListener++) { - ((VetoableChangeListener)listeners.elementAt(currentListener)).vetoableChange(proposedChange); - } - } catch(PropertyVetoException e) { - PropertyChangeEvent reversion = new PropertyChangeEvent(proposedChange.getSource(),proposedChange.getPropertyName(),proposedChange.getNewValue(),proposedChange.getOldValue()); - for(int sendAgain=0;sendAgain<currentListener;sendAgain++) { - try { - ((VetoableChangeListener)listeners.elementAt(sendAgain)).vetoableChange(reversion); - } catch(PropertyVetoException e2) { - } - } - throw e; - } - - Vector moreListeners = (Vector)propertyListeners.get(proposedChange.getPropertyName()); - if(moreListeners != null) { - try { - for(currentListener = 0; currentListener < moreListeners.size(); currentListener++) { - ((VetoableChangeListener)moreListeners.elementAt(currentListener)).vetoableChange(proposedChange); - } - } catch(PropertyVetoException e) { - PropertyChangeEvent reversion = new PropertyChangeEvent(proposedChange.getSource(),proposedChange.getPropertyName(),proposedChange.getNewValue(),proposedChange.getOldValue()); - for(int sendAgain=0;sendAgain<listeners.size();sendAgain++) { - try { - ((VetoableChangeListener)listeners.elementAt(currentListener)).vetoableChange(proposedChange); - } catch(PropertyVetoException e2) { - } - } - - for(int sendAgain=0;sendAgain<currentListener;sendAgain++) { - try { - ((VetoableChangeListener)moreListeners.elementAt(sendAgain)).vetoableChange(reversion); - } catch(PropertyVetoException e2) { - } - } - throw e; - } - } - } - - /** Fire a VetoableChangeEvent containing the old and new values of the property to all the listeners. - ** If any listener objects, a reversion event will be sent to - ** those listeners who received the initial event. - ** - ** @param propertyName the name of the property that - ** changed. - ** @param oldVal the old value. - ** @param newVal the new value. - ** @exception PropertyVetoException if the change is vetoed. - **/ - public void fireVetoableChange(String propertyName, Object oldVal, Object newVal) throws PropertyVetoException { - fireVetoableChange(new PropertyChangeEvent(bean,propertyName,oldVal,newVal)); - } - - /** Fire a VetoableChangeEvent containing the old and new values of the property to all the listeners. - ** If any listener objects, a reversion event will be sent to - ** those listeners who received the initial event. - ** - ** @param propertyName the name of the property that - ** changed. - ** @param oldVal the old value. - ** @param newVal the new value. - ** @exception PropertyVetoException if the change is vetoed. - **/ - public void fireVetoableChange(String propertyName, boolean oldVal, boolean newVal) throws PropertyVetoException { - fireVetoableChange(new PropertyChangeEvent(bean,propertyName,new Boolean(oldVal),new Boolean(newVal))); - } - - /** Fire a VetoableChangeEvent containing the old and new values of the property to all the listeners. - ** If any listener objects, a reversion event will be sent to - ** those listeners who received the initial event. - ** - ** @param propertyName the name of the property that - ** changed. - ** @param oldVal the old value. - ** @param newVal the new value. - ** @exception PropertyVetoException if the change is vetoed. - **/ - public void fireVetoableChange(String propertyName, int oldVal, int newVal) throws PropertyVetoException { - fireVetoableChange(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; - } -} |