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The source code
/*
* Sun Public License Notice
*
* The contents of this file are subject to the Sun Public License
* Version 1.0 (the "License"). You may not use this file except in
* compliance with the License. A copy of the License is available at
* http://www.sun.com/
*
* The Original Code is NetBeans. The Initial Developer of the Original
* Code is Sun Microsystems, Inc. Portions Copyright 1997-2000 Sun
* Microsystems, Inc. All Rights Reserved.
*/
package org.openide.options;
import java.beans.PropertyVetoException;
import java.beans.VetoableChangeListener;
import java.beans.PropertyChangeEvent;
import java.util.*;
/** Extends the functionality of SystemOption
* by providing support for veto listeners.
*
* @author Jaroslav Tulach
* @version 0.11 Dec 6, 1997
*/
public abstract class VetoSystemOption extends SystemOption {
/** generated Serialized Version UID */
static final long serialVersionUID = -614731095908156413L;
/** vetoable listener property */
private static final String PROP_VETO_SUPPORT = "vetoSupport"; // NOI18N
/** Default constructor. */
public VetoSystemOption() {}
/** Lazy getter for veto hashtable.
* @return the hashtable
*/
private HashSet getVeto () {
HashSet set = (HashSet)getProperty (PROP_VETO_SUPPORT);
if (set == null) {
set = new HashSet ();
putProperty (PROP_VETO_SUPPORT, set);
}
return set;
}
/** Add a new veto listener to all instances of this exact class.
* @param list the listener to add
*/
public final void addVetoableChangeListener (VetoableChangeListener list) {
synchronized (getLock ()) {
getVeto ().add (list);
}
}
/** Remove a veto listener from all instances of this exact class.
* @param list the listener to remove
*/
public final void removeVetoableChangeListener (VetoableChangeListener list) {
synchronized (getLock ()) {
getVeto ().remove (list);
}
}
/** Fire a property change event.
* @param name the name of the property
* @param oldValue the old value
* @param newValue the new value
* @exception PropertyVetoException if the change is vetoed
*/
public final void fireVetoableChange (
String name, Object oldValue, Object newValue
) throws PropertyVetoException {
PropertyChangeEvent ev = new PropertyChangeEvent (
this, name, oldValue, newValue
);
Iterator en;
synchronized (getLock ()) {
en = ((HashSet)getVeto ().clone ()).iterator ();
}
while (en.hasNext ()) {
((VetoableChangeListener)en.next ()).vetoableChange (ev);
}
}
}
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