001 /* java.beans.beancontext.BeanContextMembershipEvent
002 Copyright (C) 1999, 2004 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package java.beans.beancontext;
040
041 import java.util.Arrays;
042 import java.util.Collection;
043 import java.util.Iterator;
044
045 /**
046 * Event fired when children are added to or removed from a <code>BeanContext</code>.
047 * Whether they were added or removed depends entirely on which method
048 * of the listener interface was called.
049 *
050 * @author John Keiser
051 * @since 1.2
052 * @see java.beans.beancontext.BeanContextMembershipListener
053 */
054 public class BeanContextMembershipEvent extends BeanContextEvent {
055 private static final long serialVersionUID = 3499346510334590959L;
056
057 /**
058 * The children that were added or removed.
059 */
060 protected Collection children;
061
062 /**
063 * Create a new membership event.
064 * @param context the event source.
065 * @param children the children added to or removed from the source.
066 */
067 public BeanContextMembershipEvent(BeanContext context, Collection children) {
068 super(context);
069 this.children = children;
070 }
071
072 /**
073 * Create a new membership event.
074 * @param context the event source.
075 * @param children the children added to or removed from the source.
076 */
077 public BeanContextMembershipEvent(BeanContext context, Object[] children) {
078 super(context);
079 this.children = Arrays.asList(children);
080 }
081
082 /**
083 * The number of children removed or added.
084 * @return the number of children removed or added.
085 */
086 public int size() {
087 return children.size();
088 }
089
090 /**
091 * An iterator that will step through all the children.
092 * @return an iterator over all the children.
093 */
094 public Iterator iterator() {
095 return children.iterator();
096 }
097
098 /**
099 * An array of the children.
100 * @return an array of the children.
101 */
102 public Object[] toArray() {
103 return children.toArray();
104 }
105
106 /**
107 * Tell whether the <code>Object</code> is one of the children added or removed.
108 * @param child the child to check.
109 * @return whether the <code>Object</code> is added or removed.
110 */
111 public boolean contains(Object child) {
112 return children.contains(child);
113 }
114 }