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Java > Open Source Codes > org > netbeans > lib > jmi > query > ValueFilter


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19 package org.netbeans.lib.jmi.query;
20
21 import java.util.Comparator JavaDoc;
22
23 /** Filters all objects in Query which equals to value. Compers either bu equals()
24  * or by comparator.
25  *
26  * @author Petr Hrebejk
27  */
28 public class ValueFilter extends FilterQuery {
29
30     private final Object JavaDoc VALUE;
31     private final Comparator JavaDoc COMPARATOR;
32
33     /** Only values for which value.equals( object ) == true are included
34     */
35     public ValueFilter( Query query, Object JavaDoc value ) {
36         this( query, value, null );
37     }
38
39     /** Includes objects for which the comaprator.comapre( value, object ) == 0
40     */
41     public ValueFilter( Query query, Object JavaDoc value, Comparator JavaDoc comparator ) {
42         super( query );
43         this.VALUE = value;
44         this.COMPARATOR = comparator;
45     }
46     
47     protected boolean accept( Object JavaDoc object ) {
48         if ( COMPARATOR != null ) {
49             return COMPARATOR.compare( VALUE, object ) == 0;
50         }
51         
52         else {
53             if ( VALUE == null ) {
54                 if ( object == null ) {
55                     return true;
56                 }
57                 else {
58                     return false;
59                 }
60             }
61             else {
62                 return VALUE.equals( object );
63             }
64         }
65     }
66     
67 }
68
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