Source for javax.swing.AbstractSpinnerModel

   1: /* AbstractSpinnerModel.java --
   2:    Copyright (C) 2004, 2006, 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.util.EventListener;
  42: 
  43: import javax.swing.event.ChangeEvent;
  44: import javax.swing.event.ChangeListener;
  45: import javax.swing.event.EventListenerList;
  46: 
  47: /**
  48:  * Provides standard implementations for some of the methods in
  49:  * {@link SpinnerModel}.
  50:  *
  51:  * @since 1.4
  52:  *
  53:  * @author Ka-Hing Cheung
  54:  */
  55: public abstract class AbstractSpinnerModel implements SpinnerModel
  56: {
  57:   private ChangeEvent changeEvent = new ChangeEvent(this);
  58: 
  59:   /** Stores the listeners registered with the model. */
  60:   protected EventListenerList listenerList = new EventListenerList();
  61: 
  62:   /**
  63:    * Creates an <code>AbstractSpinnerModel</code>.
  64:    */
  65:   public AbstractSpinnerModel()
  66:   {
  67:     // Nothing to do here.
  68:   }
  69: 
  70:   /**
  71:    * Registers a <code>ChangeListener</code> with the model so that it will
  72:    * receive {@link ChangeEvent} notifications when the model changes.
  73:    *
  74:    * @param listener the listener to add (<code>null</code> is ignored).
  75:    */
  76:   public void addChangeListener(ChangeListener listener)
  77:   {
  78:     listenerList.add(ChangeListener.class, listener);
  79:   }
  80: 
  81:   /**
  82:    * Gets all the listeners that are of a particular type.
  83:    *
  84:    * @param c the type of listener
  85:    * @return the listeners that are of the specific type
  86:    */
  87:   public <T extends EventListener> T[] getListeners(Class<T> c)
  88:   {
  89:     return listenerList.getListeners(c);
  90:   }
  91: 
  92:   /**
  93:    * Gets all the <code>ChangeListener</code>s.
  94:    *
  95:    * @return all the <code>ChangeListener</code>s
  96:    */
  97:   public ChangeListener[] getChangeListeners()
  98:   {
  99:     return (ChangeListener[]) listenerList.getListeners(ChangeListener.class);
 100:   }
 101: 
 102:   /**
 103:    * Remove a particular listener.
 104:    *
 105:    * @param listener the listener to remove
 106:    */
 107:   public void removeChangeListener(ChangeListener listener)
 108:   {
 109:     listenerList.remove(ChangeListener.class, listener);
 110:   }
 111: 
 112:   /**
 113:    * Fires a <code>ChangeEvent</code> to all the <code>ChangeListener</code>s
 114:    * added to this model
 115:    */
 116:   protected void fireStateChanged()
 117:   {
 118:     ChangeListener[] listeners = getChangeListeners();
 119: 
 120:     for (int i = 0; i < listeners.length; ++i)
 121:       listeners[i].stateChanged(changeEvent);
 122:   }
 123: }