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| 1 | /* | ||
| 2 | * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package javax.swing; | ||
| 27 | |||
| 28 | import java.util.*; | ||
| 29 | import javax.swing.event.*; | ||
| 30 | import java.io.Serializable; | ||
| 31 | |||
| 32 | |||
| 33 | /** | ||
| 34 | * This class provides the ChangeListener part of the | ||
| 35 | * SpinnerModel interface that should be suitable for most concrete SpinnerModel | ||
| 36 | * implementations. Subclasses must provide an implementation of the | ||
| 37 | * <code>setValue</code>, <code>getValue</code>, <code>getNextValue</code> and | ||
| 38 | * <code>getPreviousValue</code> methods. | ||
| 39 | * | ||
| 40 | * @see JSpinner | ||
| 41 | * @see SpinnerModel | ||
| 42 | * @see SpinnerListModel | ||
| 43 | * @see SpinnerNumberModel | ||
| 44 | * @see SpinnerDateModel | ||
| 45 | * | ||
| 46 | * @author Hans Muller | ||
| 47 | * @since 1.4 | ||
| 48 | */ | ||
| 49 | public abstract class AbstractSpinnerModel implements SpinnerModel, Serializable | ||
| 50 | { | ||
| 51 | |||
| 52 | /** | ||
| 53 | * Only one ChangeEvent is needed per model instance since the | ||
| 54 | * event's only (read-only) state is the source property. The source | ||
| 55 | * of events generated here is always "this". | ||
| 56 | */ | ||
| 57 | private transient ChangeEvent changeEvent = null; | ||
| 58 | |||
| 59 | |||
| 60 | /** | ||
| 61 | * The list of ChangeListeners for this model. Subclasses may | ||
| 62 | * store their own listeners here. | ||
| 63 | */ | ||
| 64 | protected EventListenerList listenerList = new EventListenerList(); | ||
| 65 | |||
| 66 | |||
| 67 | /** | ||
| 68 | * Adds a ChangeListener to the model's listener list. The | ||
| 69 | * ChangeListeners must be notified when the models value changes. | ||
| 70 | * | ||
| 71 | * @param l the ChangeListener to add | ||
| 72 | * @see #removeChangeListener | ||
| 73 | * @see SpinnerModel#addChangeListener | ||
| 74 | */ | ||
| 75 | public void addChangeListener(ChangeListener l) { | ||
| 76 | listenerList.add(ChangeListener.class, l); | ||
| 77 | } | ||
| 78 | |||
| 79 | |||
| 80 | /** | ||
| 81 | * Removes a ChangeListener from the model's listener list. | ||
| 82 | * | ||
| 83 | * @param l the ChangeListener to remove | ||
| 84 | * @see #addChangeListener | ||
| 85 | * @see SpinnerModel#removeChangeListener | ||
| 86 | */ | ||
| 87 | public void removeChangeListener(ChangeListener l) { | ||
| 88 | listenerList.remove(ChangeListener.class, l); | ||
| 89 | } | ||
| 90 | |||
| 91 | |||
| 92 | /** | ||
| 93 | * Returns an array of all the <code>ChangeListener</code>s added | ||
| 94 | * to this AbstractSpinnerModel with addChangeListener(). | ||
| 95 | * | ||
| 96 | * @return all of the <code>ChangeListener</code>s added or an empty | ||
| 97 | * array if no listeners have been added | ||
| 98 | * @since 1.4 | ||
| 99 | */ | ||
| 100 | public ChangeListener[] getChangeListeners() { | ||
| 101 | return listenerList.getListeners(ChangeListener.class); | ||
| 102 | } | ||
| 103 | |||
| 104 | |||
| 105 | /** | ||
| 106 | * Run each ChangeListeners stateChanged() method. | ||
| 107 | * | ||
| 108 | * @see #setValue | ||
| 109 | * @see EventListenerList | ||
| 110 | */ | ||
| 111 | protected void fireStateChanged() | ||
| 112 | { | ||
| 113 | Object[] listeners = listenerList.getListenerList(); | ||
| 114 | for (int i = listeners.length - 2; i >= 0; i -=2 ) { | ||
| 115 | if (listeners[i] == ChangeListener.class) { | ||
| 116 | if (changeEvent == null) { | ||
| 117 | changeEvent = new ChangeEvent(this); | ||
| 118 | } | ||
| 119 | ((ChangeListener)listeners[i+1]).stateChanged(changeEvent); | ||
| 120 | } | ||
| 121 | } | ||
| 122 | } | ||
| 123 | |||
| 124 | |||
| 125 | /** | ||
| 126 | * Return an array of all the listeners of the given type that | ||
| 127 | * were added to this model. For example to find all of the | ||
| 128 | * ChangeListeners added to this model: | ||
| 129 | * <pre> | ||
| 130 | * myAbstractSpinnerModel.getListeners(ChangeListener.class); | ||
| 131 | * </pre> | ||
| 132 | * | ||
| 133 | * @param listenerType the type of listeners to return, e.g. ChangeListener.class | ||
| 134 | * @return all of the objects receiving <em>listenerType</em> notifications | ||
| 135 | * from this model | ||
| 136 | */ | ||
| 137 | public <T extends EventListener> T[] getListeners(Class<T> listenerType) { | ||
| 138 | return listenerList.getListeners(listenerType); | ||
| 139 | } | ||
| 140 | } | ||