libjava/javax/swing/DefaultSingleSelectionModel.java

   1 /* DefaultSingleSelectionModel.java --
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 package javax.swing;
  39
  40 import java.io.Serializable;
  41 import java.util.EventListener;
  42 import javax.swing.event.ChangeEvent;
  43 import javax.swing.event.ChangeListener;
  44 import javax.swing.event.EventListenerList;
  45
  46 /**
  47  * DefaultSingleSelectionModel
  48  * @author      Andrew Selkirk
  49  * @version     1.0
  50  */
  51 public class DefaultSingleSelectionModel
  52   implements SingleSelectionModel, Serializable
  53 {
  54   static final long serialVersionUID = 3676229404753786004L;
  55
  56   /**
  57    * changeEvent
  58    */
  59   protected transient ChangeEvent changeEvent = new ChangeEvent (this);
  60
  61   /**
  62    * listenerList
  63    */
  64   protected EventListenerList listenerList= new EventListenerList ();
  65
  66   /**
  67    * index
  68    */
  69   private int index = -1;
  70
  71   /**
  72    * Constructor DefaultSingleSelectionModel
  73    */
  74   public DefaultSingleSelectionModel ()
  75   {
  76   }
  77
  78   /**
  79    * getSelectedIndex
  80    * @returns int
  81    */
  82   public int getSelectedIndex ()
  83   {
  84     return index;
  85   }
  86
  87   /**
  88    * setSelectedIndex
  89    * @param index TODO
  90    */
  91   public void setSelectedIndex (int index)
  92   {
  93     // Set Data
  94     this.index = index;
  95
  96     // Notify Listeners
  97     fireStateChanged ();
  98   }
  99
 100   /**
 101    * clearSelection
 102    */
 103   public void clearSelection ()
 104   {
 105     // Set Data
 106     index = -1;
 107
 108     // Notify Listeners
 109     fireStateChanged ();
 110   }
 111
 112   /**
 113    * isSelected
 114    * @returns boolean
 115    */
 116   public boolean isSelected ()
 117   {
 118     return (index != -1);
 119   }
 120
 121   /**
 122    * addChangeListener
 123    * @param listener TODO
 124    */
 125   public void addChangeListener (ChangeListener listener)
 126   {
 127     listenerList.add (ChangeListener.class, listener);
 128   }
 129
 130   /**
 131    * removeChangeListener
 132    * @param listener TODO
 133    */
 134   public void removeChangeListener (ChangeListener listener)
 135   {
 136     listenerList.remove (ChangeListener.class, listener);
 137   }
 138
 139   /**
 140    * fireStateChanged
 141    */
 142   protected void fireStateChanged ()
 143   {
 144     // Variables
 145     ChangeListener listener;
 146     ChangeListener[] listeners;
 147     int index;
 148
 149     // Get Listeners
 150     listeners = getChangeListeners ();
 151
 152     // Process Listeners
 153     for (index = 0; index < listeners.length; index++)
 154       {
 155         listener = listeners [index];
 156         listener.stateChanged (changeEvent);
 157       }
 158   }
 159
 160   /**
 161    * getListeners
 162    * @param listenerClass TODO
 163    * @returns EventListener[]
 164    */
 165   public EventListener[] getListeners (Class listenerClass)
 166   {
 167     return listenerList.getListeners (listenerClass);
 168   }
 169
 170   /**
 171    * getChangeListeners
 172    */
 173   public ChangeListener[] getChangeListeners ()
 174   {
 175     return (ChangeListener[]) getListeners (ChangeListener.class);
 176   }
 177 }