DataBindingListener.java :  » XML-UI » JAXX » jaxx » runtime » Java Open Source

/*
 * Copyright 2006 Ethan Nicholas. All rights reserved.
 * Use is subject to license terms.
 */
package jaxx.runtime;

import java.beans.*;


/** A <code>PropertyChangeListener</code> which processes a data binding when it receives a
  * <code>PropertyChangeEvent</code>.
  */
public class DataBindingListener implements PropertyChangeListener {
    private JAXXObject object;
    private String dest;
    
    /** Creates a new <code>DataBindingListener</code> which will run the given data binding
      * when it receives a <code>PropertyChangeEvent</code>.
      *
      *@param object the object in which the data binding exists
      *@param dest the name of the data binding to run
      */
    public DataBindingListener(JAXXObject object, String dest) {
        this.object = object;
        this.dest = dest;
    }

    
    /** Processes the data binding in response to a <code>PropertyChangeEvent</code>.
      *
      *@param e the event which triggered the binding
      */
    public void propertyChange(PropertyChangeEvent e) {
        object.processDataBinding(dest);

        // for now, handle dependency changes by always removing & reapplying
        // the binding.  We should be more efficient and only do this when it's
        // actually necessary
        object.removeDataBinding(dest);
        object.applyDataBinding(dest);
    }
}