/*
    * Copyright (c) 2005, The JUNG Authors
    * All rights reserved.
    * 
    * This software is open-source under the BSD license; see either "license.txt"
    * or https://github.com/jrtom/jung/blob/master/LICENSE for a description.
    * 
    *
    * Created on Apr 2, 2005
   */
  package edu.uci.ics.jung.visualization.picking;
  
  import java.awt.event.ItemEvent;
  import java.awt.event.ItemListener;
  
  import javax.swing.event.EventListenerList;
  
  /**
   * An abstract class to support ItemEvents for PickedState
   * 
   * @author Tom Nelson
   */
  public abstract class AbstractPickedState<T> implements PickedState<T> {
      
      protected EventListenerList listenerList = new EventListenerList();
  
      public void addItemListener(ItemListener l) {
          listenerList.add(ItemListener.class, l);
          
      }
  
      public void removeItemListener(ItemListener l) {
          listenerList.remove(ItemListener.class, l);
      }
      
      protected void fireItemStateChanged(ItemEvent e) {
          Object[] listeners = listenerList.getListenerList();
          for ( int i = listeners.length-2; i>=0; i-=2 ) {
              if ( listeners[i]==ItemListener.class ) {
                  ((ItemListener)listeners[i+1]).itemStateChanged(e);
              }
          }
      }   
  }