libjava/java/beans/beancontext/BeanContextMembershipEvent.java

   1 /* java.beans.beancontext.BeanContextMembershipEvent
   2    Copyright (C) 1999 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package java.beans.beancontext;
  40
  41 import java.util.Collection;
  42 import java.util.Arrays;
  43 import java.util.Iterator;
  44
  45 /**
  46  * Event fired when children are added to or removed from a <code>BeanContext</code>.
  47  * Whether they were added or removed depends entirely on which method
  48  * of the listener interface was called.
  49  *
  50  * @author John Keiser
  51  * @since JDK1.2
  52  * @see java.beans.beancontext.BeanContextMembershipListener
  53  */
  54
  55 public class BeanContextMembershipEvent extends BeanContextEvent {
  56         /**
  57          * The children that were added or removed.
  58          */
  59         protected Collection children;
  60
  61         /**
  62          * Create a new membership event.
  63          * @param context the event source.
  64          * @param children the children added to or removed from the source.
  65          */
  66         public BeanContextMembershipEvent(BeanContext context, Collection children) {
  67                 super(context);
  68                 this.children = children;
  69         }
  70
  71         /**
  72          * Create a new membership event.
  73          * @param context the event source.
  74          * @param children the children added to or removed from the source.
  75          */
  76         public BeanContextMembershipEvent(BeanContext context, Object[] children) {
  77                 super(context);
  78                 this.children = Arrays.asList(children);
  79         }
  80
  81         /**
  82          * The number of children removed or added.
  83          * @return the number of children removed or added.
  84          */
  85         public int size() {
  86                 return children.size();
  87         }
  88
  89         /**
  90          * An iterator that will step through all the children.
  91          * @return an iterator over all the children.
  92          */
  93         public Iterator iterator() {
  94                 return children.iterator();
  95         }
  96
  97         /**
  98          * An array of the children.
  99          * @return an array of the children.
 100          */
 101         public Object[] toArray() {
 102                 return children.toArray();
 103         }
 104
 105         /**
 106          * Tell whether the <code>Object</code> is one of the children added or removed.
 107          * @param child the child to check.
 108          * @return whether the <code>Object</code> is added or removed.
 109          */
 110         public boolean contains(Object child) {
 111                 return children.contains(child);
 112         }
 113 }