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    }