libjava/javax/swing/AbstractListModel.java

   1 /* AbstractListModel.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., 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
  39 package javax.swing;
  40
  41 import java.io.Serializable;
  42 import java.util.EventListener;
  43
  44 import javax.swing.event.EventListenerList;
  45 import javax.swing.event.ListDataEvent;
  46 import javax.swing.event.ListDataListener;
  47
  48 /**
  49  * AbstractListModel
  50  *
  51  * @author Ronald Veldema
  52  * @author Andrew Selkirk
  53  * @version 1.0
  54  */
  55 public abstract class AbstractListModel implements ListModel, Serializable
  56 {
  57   private static final long serialVersionUID = -3285184064379168730L;
  58
  59   /** List of ListDataListeners called for each change to the list. */
  60   protected EventListenerList listenerList;
  61
  62   public AbstractListModel()
  63   {
  64     listenerList = new EventListenerList();
  65   }
  66
  67   /**
  68    * Add a listener object to this model. The listener will be called
  69    * any time the set of elements in the model is changed.
  70    *
  71    * @param listener The listener to add
  72    */
  73   public void addListDataListener(ListDataListener listener)
  74   {
  75     listenerList.add(ListDataListener.class, listener);
  76   }
  77
  78   /**
  79    * Add a listener object to this model. The listener will no longer be
  80    * called when the set of elements in the model is changed.
  81    *
  82    * @param listener The listener to remove
  83    */
  84   public void removeListDataListener(ListDataListener listener)
  85   {
  86     listenerList.remove(ListDataListener.class, listener);
  87   }
  88
  89   /**
  90    * Call {@link ListDataListener#contentsChanged} on each element of the
  91    * {@link listenerList} which is a {@link ListDataListener}. The event
  92    * fired has type {@ListDataEvent.CONTENTS_CHANGED} and represents a
  93    * change to the data elements in the range [startIndex, endIndex]
  94    * inclusive.
  95    *
  96    * @param source The source of the change, typically <code>this</code>
  97    * @param startIndex The index of the first element which changed
  98    * @param endIndex The index of the last element which changed
  99    */
 100   protected void fireContentsChanged(Object source, int startIndex,
 101                                      int endIndex)
 102   {
 103     ListDataEvent event = new ListDataEvent(source, ListDataEvent.CONTENTS_CHANGED,
 104                                             startIndex, endIndex);
 105     ListDataListener[] listeners = getListDataListeners();
 106
 107     for (int index = 0; index < listeners.length; index++)
 108       listeners[index].contentsChanged(event);
 109   }
 110
 111   /**
 112    * Call {@link ListDataListener#intervalAdded} on each element of the
 113    * {@link listenerList} which is a {@link ListDataListener}. The event
 114    * fired has type {@ListDataEvent.INTERVAL_ADDED} and represents an
 115    * addition of the data elements in the range [startIndex, endIndex]
 116    * inclusive.
 117    *
 118    * @param source The source of the change, typically <code>this</code>
 119    * @param startIndex The index of the first new element
 120    * @param endIndex The index of the last new element
 121    */
 122   protected void fireIntervalAdded(Object source, int startIndex, int endIndex)
 123   {
 124     ListDataEvent event =
 125       new ListDataEvent(source, ListDataEvent.INTERVAL_ADDED,
 126                         startIndex, endIndex);
 127     ListDataListener[] listeners = getListDataListeners();
 128
 129     for (int index = 0; index < listeners.length; index++)
 130       listeners[index].intervalAdded(event);
 131   }
 132
 133   /**
 134    * Call {@link ListDataListener#intervalRemoved} on each element of the
 135    * {@link listenerList} which is a {@link ListDataListener}. The event
 136    * fired has type {@ListDataEvent.INTERVAL_REMOVED} and represents a
 137    * removal of the data elements in the range [startIndex, endIndex]
 138    * inclusive.
 139    *
 140    * @param source The source of the change, typically <code>this</code>
 141    * @param startIndex The index of the first element removed
 142    * @param endIndex The index of the last element removed
 143    */
 144   protected void fireIntervalRemoved(Object source, int startIndex,
 145                                      int endIndex)
 146   {
 147     ListDataEvent event =
 148       new ListDataEvent(source, ListDataEvent.INTERVAL_REMOVED,
 149                         startIndex, endIndex);
 150     ListDataListener[] listeners = getListDataListeners();
 151
 152     for (int index = 0; index < listeners.length; index++)
 153       listeners[index].intervalRemoved(event);
 154   }
 155
 156   /**
 157    * Return the subset of {@link EventListener} objects found in this
 158    * object's {@link listenerList} which are elements of the specified
 159    * type.
 160    *
 161    * @param listenerType The type of listeners to select
 162    *
 163    * @return The set of listeners of the specified type
 164    */
 165   public EventListener[] getListeners(Class listenerType)
 166   {
 167     return listenerList.getListeners(listenerType);
 168   }
 169
 170   /**
 171    * A synonym for <code>getListeners(ListDataListener.class)</code>.
 172    *
 173    * @return The set of ListDataListeners found in the {@link listenerList}
 174    */
 175   public ListDataListener[] getListDataListeners()
 176   {
 177     return (ListDataListener[]) getListeners(ListDataListener.class);
 178   }
 179 }