jtulach@287: package org.apidesign.friendpackage.api;
jtulach@0: 
jtulach@0: import javax.swing.event.ChangeEvent;
jtulach@0: import javax.swing.event.ChangeListener;
jtulach@287: import org.apidesign.friendpackage.impl.Accessor;
jtulach@0: 
jtulach@0: /** Class in API that everyone can use.
jtulach@0:  *
jtulach@0:  * @author Jaroslav Tulach
jtulach@0:  */
jtulach@3: // BEGIN: design.less.friend.Item
jtulach@0: public final class Item {
jtulach@0:     private int value;
jtulach@0:     private ChangeListener listener;
jtulach@3: 
jtulach@190:     /** Only friends can create instances. */
jtulach@0:     Item() {
jtulach@0:     }
jtulach@0:     
jtulach@190:     /** Anyone can change value of the item. 
jtulach@0:      */
jtulach@190:     public void setValue(int newValue) {
jtulach@190:         value = newValue;
jtulach@0:         ChangeListener l = listener;
jtulach@0:         if (l != null) {
jtulach@0:             l.stateChanged(new ChangeEvent(this));
jtulach@0:         }
jtulach@0:     }
jtulach@0:     
jtulach@0:     /** Anyone can get the value of the item. 
jtulach@0:      */
jtulach@0:     public int getValue() {
jtulach@0:         return value;
jtulach@0:     }
jtulach@0:     
jtulach@190:     /** Only friends can listen to changes.
jtulach@0:      */
jtulach@0:     void addChangeListener(ChangeListener l) {
jtulach@0:         assert listener == null;
jtulach@0:         listener = l;
jtulach@0:     }
jtulach@285: // FINISH: design.less.friend.Item
jtulach@285: 
jtulach@285:     // BEGIN: design.less.friend.Item.static
jtulach@285:     static {
jtulach@285:         Accessor.setDefault(new AccessorImpl());
jtulach@285:     }
jtulach@285:     // END: design.less.friend.Item.static
jtulach@0: }