001/* java.beans.beancontext.BeanContextMembershipEvent 002 Copyright (C) 1999, 2004 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package java.beans.beancontext; 040 041import java.util.Arrays; 042import java.util.Collection; 043import 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 */ 054public 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}