jtulach@0: /*
jtulach@0:  *                 Sun Public License Notice
jtulach@0:  * 
jtulach@0:  * The contents of this file are subject to the Sun Public License
jtulach@0:  * Version 1.0 (the "License"). You may not use this file except in
jtulach@0:  * compliance with the License. A copy of the License is available at
jtulach@0:  * http://www.sun.com/
jtulach@0:  * 
jtulach@0:  * The Original Code is NetBeans. The Initial Developer of the Original
jtulach@36:  * Code is Jaroslav Tulach. Portions Copyright 2007 Jaroslav Tulach. 
jtulach@36:  * All Rights Reserved.
jtulach@0:  */
jtulach@0: 
jtulach@0: package implpkg;
jtulach@0: 
jtulach@0: import apipkg.Item;
jtulach@0: import javax.swing.event.ChangeListener;
jtulach@0: 
jtulach@0: /**
jtulach@0:  *
jtulach@0:  * @author Jaroslav Tulach
jtulach@0:  */
jtulach@3: // BEGIN: design.less.friend.Accessor
jtulach@0: public abstract class Accessor {
jtulach@128:     private static volatile Accessor DEFAULT;
jtulach@128:     public static Accessor getDefault() {
jtulach@128:         Accessor a = DEFAULT;
jtulach@128:         if (a != null) {
jtulach@128:             return a;
jtulach@128:         }
jtulach@128:         
jtulach@0:         try {
jtulach@132:             Class.forName(
jtulach@132:                 Item.class.getName(), true, Item.class.getClassLoader()
jtulach@132:             );
jtulach@0:         } catch (Exception ex) {
jtulach@0:             ex.printStackTrace();
jtulach@0:         }
jtulach@128:         
jtulach@128:         return DEFAULT;
jtulach@128:     }
jtulach@128: 
jtulach@128:     public static void setDefault(Accessor accessor) {
jtulach@128:         if (DEFAULT != null) {
jtulach@128:             throw new IllegalStateException();
jtulach@128:         }
jtulach@128:         DEFAULT = accessor;
jtulach@0:     }
jtulach@0:     
jtulach@0:     public Accessor() {
jtulach@0:     }
jtulach@0: 
jtulach@0:     protected abstract Item newItem();
jtulach@0:     protected abstract void addChangeListener(Item item, ChangeListener l);
jtulach@0: }
jtulach@3: // END: design.less.friend.Accessor