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| 1 | +/* | |
| 2 | + * Copyright (c) 1997, 2009, 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 java.beans.beancontext; | |
| 27 | + | |
| 28 | +import java.util.EventObject; | |
| 29 | + | |
| 30 | +import java.beans.beancontext.BeanContext; | |
| 31 | +import java.beans.beancontext.BeanContextEvent; | |
| 32 | + | |
| 33 | +import java.util.Arrays; | |
| 34 | +import java.util.Collection; | |
| 35 | +import java.util.Iterator; | |
| 36 | + | |
| 37 | +/** | |
| 38 | + * A <code>BeanContextMembershipEvent</code> encapsulates | |
| 39 | + * the list of children added to, or removed from, | |
| 40 | + * the membership of a particular <code>BeanContext</code>. | |
| 41 | + * An instance of this event is fired whenever a successful | |
| 42 | + * add(), remove(), retainAll(), removeAll(), or clear() is | |
| 43 | + * invoked on a given <code>BeanContext</code> instance. | |
| 44 | + * Objects interested in receiving events of this type must | |
| 45 | + * implement the <code>BeanContextMembershipListener</code> | |
| 46 | + * interface, and must register their intent via the | |
| 47 | + * <code>BeanContext</code>'s | |
| 48 | + * <code>addBeanContextMembershipListener(BeanContextMembershipListener bcml) | |
| 49 | + * </code> method. | |
| 50 | + * | |
| 51 | + * @author Laurence P. G. Cable | |
| 52 | + * @since 1.2 | |
| 53 | + * @see java.beans.beancontext.BeanContext | |
| 54 | + * @see java.beans.beancontext.BeanContextEvent | |
| 55 | + * @see java.beans.beancontext.BeanContextMembershipListener | |
| 56 | + */ | |
| 57 | +public class BeanContextMembershipEvent extends BeanContextEvent { | |
| 58 | + private static final long serialVersionUID = 3499346510334590959L; | |
| 59 | + | |
| 60 | + /** | |
| 61 | + * Contruct a BeanContextMembershipEvent | |
| 62 | + * | |
| 63 | + * @param bc The BeanContext source | |
| 64 | + * @param changes The Children affected | |
| 65 | + * @throws NullPointerException if <CODE>changes</CODE> is <CODE>null</CODE> | |
| 66 | + */ | |
| 67 | + | |
| 68 | + public BeanContextMembershipEvent(BeanContext bc, Collection changes) { | |
| 69 | + super(bc); | |
| 70 | + | |
| 71 | + if (changes == null) throw new NullPointerException( | |
| 72 | + "BeanContextMembershipEvent constructor: changes is null."); | |
| 73 | + | |
| 74 | + children = changes; | |
| 75 | + } | |
| 76 | + | |
| 77 | + /** | |
| 78 | + * Contruct a BeanContextMembershipEvent | |
| 79 | + * | |
| 80 | + * @param bc The BeanContext source | |
| 81 | + * @param changes The Children effected | |
| 82 | + * @exception NullPointerException if changes associated with this | |
| 83 | + * event are null. | |
| 84 | + */ | |
| 85 | + | |
| 86 | + public BeanContextMembershipEvent(BeanContext bc, Object[] changes) { | |
| 87 | + super(bc); | |
| 88 | + | |
| 89 | + if (changes == null) throw new NullPointerException( | |
| 90 | + "BeanContextMembershipEvent: changes is null."); | |
| 91 | + | |
| 92 | + children = Arrays.asList(changes); | |
| 93 | + } | |
| 94 | + | |
| 95 | + /** | |
| 96 | + * Gets the number of children affected by the notification. | |
| 97 | + * @return the number of children affected by the notification | |
| 98 | + */ | |
| 99 | + public int size() { return children.size(); } | |
| 100 | + | |
| 101 | + /** | |
| 102 | + * Is the child specified affected by the event? | |
| 103 | + * @return <code>true</code> if affected, <code>false</code> | |
| 104 | + * if not | |
| 105 | + */ | |
| 106 | + public boolean contains(Object child) { | |
| 107 | + return children.contains(child); | |
| 108 | + } | |
| 109 | + | |
| 110 | + /** | |
| 111 | + * Gets the array of children affected by this event. | |
| 112 | + * @return the array of children affected | |
| 113 | + */ | |
| 114 | + public Object[] toArray() { return children.toArray(); } | |
| 115 | + | |
| 116 | + /** | |
| 117 | + * Gets the array of children affected by this event. | |
| 118 | + * @return the array of children effected | |
| 119 | + */ | |
| 120 | + public Iterator iterator() { return children.iterator(); } | |
| 121 | + | |
| 122 | + /* | |
| 123 | + * fields | |
| 124 | + */ | |
| 125 | + | |
| 126 | + /** | |
| 127 | + * The list of children affected by this | |
| 128 | + * event notification. | |
| 129 | + */ | |
| 130 | + protected Collection children; | |
| 131 | +} | |