/*

  *                 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 Jaroslav Tulach. Portions Copyright 2007 Jaroslav Tulach. 

  * All Rights Reserved.

  */

 package implpkg;

 import apipkg.Item;

 import javax.swing.event.ChangeListener;

 /**

  *

  * @author Jaroslav Tulach

  */

 // BEGIN: design.less.friend.Accessor

 public abstract class Accessor {

     private static volatile Accessor DEFAULT;

     public static Accessor getDefault() {

         Accessor a = DEFAULT;

         if (a != null) {

             return a;

         }

         try {

             Class.forName(

                 Item.class.getName(), true, Item.class.getClassLoader()

             );

         } catch (Exception ex) {

             ex.printStackTrace();

         }

         return DEFAULT;

     }

     public static void setDefault(Accessor accessor) {

         if (DEFAULT != null) {

             throw new IllegalStateException();

         }

         DEFAULT = accessor;

     }

     public Accessor() {

     }

     protected abstract Item newItem();

     protected abstract void addChangeListener(Item item, ChangeListener l);

 }

 // END: design.less.friend.Accessor