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