Source code: org/progeeks/meta/ListPropertyChangeEvent.java
1 /*
2 * $Id: ListPropertyChangeEvent.java,v 1.2 2003/07/20 04:03:03 pspeed Exp $
3 *
4 * Copyright (c) 2001-2002, Paul Speed
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1) Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * 2) Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3) Neither the names "Progeeks", "Meta-JB", nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 package org.progeeks.meta;
34
35 import java.beans.PropertyChangeEvent;
36
37 /**
38 * An extension to the standard PropertyChangeEvent that provides
39 * information about changes to the list. Standard property change
40 * events don't handle this very well since the list object itself
41 * will be the same.
42 *
43 * @version $Revision: 1.2 $
44 * @author Paul Speed
45 */
46 public class ListPropertyChangeEvent extends PropertyChangeEvent
47 {
48 public static final int INSERT = 0;
49 public static final int UPDATE = 1;
50 public static final int DELETE = 2;
51
52 private int firstIndex;
53 private int lastIndex;
54 private int type;
55
56 public ListPropertyChangeEvent( Object source, String propertyName, Object list,
57 int firstIndex, int lastIndex, int changeType )
58 {
59 super( source, propertyName, null, list );
60
61 this.firstIndex = firstIndex;
62 this.lastIndex = lastIndex;
63 this.type = changeType;
64 }
65
66 /**
67 * Creates a copy of the specified event but using a different source.
68 */
69 public ListPropertyChangeEvent( Object source, ListPropertyChangeEvent event )
70 {
71 this( source, event.getPropertyName(), event.getNewValue(),
72 event.getFirstIndex(), event.getLastIndex(), event.getType() );
73 }
74
75 /**
76 * Returns the first index of the modified range. For deleted elements, this
77 * will refer to the index of the element prior to being removed. For added
78 * elements, it refers to the index after being added.
79 */
80 public int getFirstIndex()
81 {
82 return( firstIndex );
83 }
84
85 /**
86 * Returns the last index of the modified range. For deleted elements, this
87 * will refer to the index of the element prior to being removed. For added
88 * elements, it refers to the index after being added.
89 */
90 public int getLastIndex()
91 {
92 return( lastIndex );
93 }
94
95 /**
96 * Returns the type of change done, one of: INSERT, UPDATE, or DELETE.
97 */
98 public int getType()
99 {
100 return( type );
101 }
102 }