/*
 *                 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 1997-2004 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.editor;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.AbstractAction;
import javax.swing.Action;

/**
 * Action that delegates on delegate action.
 *
 * @author  Miloslav Metelka, Martin Roskanin
 */
public class DelegateAction extends AbstractAction {
    
    protected Action delegate;
    private PropertyChangeListener pcl;

    public DelegateAction() {
        this(null);
    }
    
    public DelegateAction(Action delegate) {
        this.delegate = delegate;
        pcl = new PropertyChangeListener(){
             public void propertyChange(PropertyChangeEvent evt){
                 
                 if(evt!=null){
                     if ("enabled".equals(evt.getPropertyName())){ //NOI18N
                         setEnabled(((Boolean)evt.getNewValue()).booleanValue());
                     }else{
                         firePropertyChange(evt.getPropertyName(), evt.getOldValue(), evt.getNewValue());
                     }
                 }
             }
        };
    }

    protected final Action getDelegate() {
        return delegate;
    }
    
    protected void setDelegate(Action delegate){
        
        if (this.delegate == delegate) return;
        
        if (delegate == this) throw new IllegalStateException("Cannot delegate on the same action"); // NOI18N
        
        if (this.delegate != null){
            this.delegate.removePropertyChangeListener(pcl);
        }
        if (delegate != null) {
            delegate.addPropertyChangeListener(pcl);
        }

        this.delegate = delegate;
        
        setEnabled((delegate != null) ? delegate.isEnabled() : false);
    }
    
    public void actionPerformed(java.awt.event.ActionEvent e) {
        if (delegate != null){
            delegate.actionPerformed(e);
        }
    }
    
    
    public Object getValue(String key) {
        if (delegate != null){
            return delegate.getValue(key);
        }else{
            return super.getValue(key);
        }
    }
    
    
    public void putValue(String key, Object value) {
        if (delegate != null){
            delegate.putValue(key, value);
        }else{
            super.putValue(key, value);
        }
    }
    
    
}