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    */
AbstractSpinnerModel()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    */
addChangeListener(ChangeListener listener)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    */
getListeners(Class<T> c)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    */
getChangeListeners()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    */
removeChangeListener(ChangeListener listener)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    */
fireStateChanged()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 }
124