Source for javax.swing.DefaultSingleSelectionModel

   1: /* DefaultSingleSelectionModel.java --
   2:    Copyright (C) 2002, 2004  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., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 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: 
  39: package javax.swing;
  40: 
  41: import java.io.Serializable;
  42: import java.util.EventListener;
  43: 
  44: import javax.swing.event.ChangeEvent;
  45: import javax.swing.event.ChangeListener;
  46: import javax.swing.event.EventListenerList;
  47: 
  48: /**
  49:  * DefaultSingleSelectionModel
  50:  *
  51:  * @author Andrew Selkirk
  52:  */
  53: public class DefaultSingleSelectionModel
  54:   implements SingleSelectionModel, Serializable
  55: {
  56:   private static final long serialVersionUID = 3676229404753786004L;
  57: 
  58:   /**
  59:    * changeEvent
  60:    */
  61:   protected transient ChangeEvent changeEvent = new ChangeEvent(this);
  62: 
  63:   /**
  64:    * listenerList
  65:    */
  66:   protected EventListenerList listenerList = new EventListenerList();
  67: 
  68:   /**
  69:    * index
  70:    */
  71:   private int index = -1;
  72: 
  73:   /**
  74:    * Constructor DefaultSingleSelectionModel
  75:    */
  76:   public DefaultSingleSelectionModel()
  77:   {
  78:     // Do nothing.
  79:   }
  80: 
  81:   /**
  82:    * getSelectedIndex
  83:    * @return int
  84:    */
  85:   public int getSelectedIndex()
  86:   {
  87:     return index;
  88:   }
  89: 
  90:   /**
  91:    * setSelectedIndex
  92:    * @param index TODO
  93:    */
  94:   public void setSelectedIndex(int index)
  95:   {
  96:     this.index = index;
  97:     fireStateChanged();
  98:   }
  99: 
 100:   /**
 101:    * clearSelection
 102:    */
 103:   public void clearSelection()
 104:   {
 105:     index = -1;
 106:     fireStateChanged();
 107:   }
 108: 
 109:   /**
 110:    * isSelected
 111:    * @return boolean
 112:    */
 113:   public boolean isSelected()
 114:   {
 115:     return index != -1;
 116:   }
 117: 
 118:   /**
 119:    * addChangeListener
 120:    *
 121:    * @param listener the listener to add
 122:    */
 123:   public void addChangeListener(ChangeListener listener)
 124:   {
 125:     listenerList.add(ChangeListener.class, listener);
 126:   }
 127: 
 128:   /**
 129:    * removeChangeListener
 130:    *
 131:    * @param listener the listener to remove
 132:    */
 133:   public void removeChangeListener(ChangeListener listener)
 134:   {
 135:     listenerList.remove(ChangeListener.class, listener);
 136:   }
 137: 
 138:   /**
 139:    * fireStateChanged
 140:    */
 141:   protected void fireStateChanged()
 142:   {
 143:     ChangeListener[] listeners = getChangeListeners();
 144: 
 145:     for (int i = 0; i < listeners.length; i++)
 146:       listeners[i].stateChanged(changeEvent);
 147:   }
 148: 
 149:   /**
 150:    * getListeners
 151:    *
 152:    * @param listenerClass the type fo listener
 153:    *
 154:    * @return an array of listeners
 155:    *
 156:    * @since 1.3
 157:    */
 158:   public EventListener[] getListeners(Class listenerClass)
 159:   {
 160:     return listenerList.getListeners(listenerClass);
 161:   }
 162: 
 163:   /**
 164:    * getChangeListeners
 165:    *
 166:    * @since 1.4
 167:    */
 168:   public ChangeListener[] getChangeListeners()
 169:   {
 170:     return (ChangeListener[]) getListeners(ChangeListener.class);
 171:   }
 172: }