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Java > Open Source Codes > org > xquark > mediator > DOMUtils > TupleKey


1 /*
2  * This file belongs to the XQuark distribution.
3  * Copyright (C) 2003 Universite de Versailles Saint-Quentin.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307.
18  * You can also get it at http://www.gnu.org/licenses/lgpl.html
19  *
20  * For more information on this software, see http://www.xquark.org.
21  */
22
23 package org.xquark.mediator.DOMUtils;
24
25 import java.util.ArrayList JavaDoc;
26
27 import org.xquark.xquery.parser.util.Constants;
28
29 public class TupleKey extends ArrayList JavaDoc implements Comparable JavaDoc {
30     // **********************************************************************
31 // * VERSIONING
32 // **********************************************************************
33 private static final String JavaDoc RCSRevision = "$Revision: 1.3 $";
34     private static final String JavaDoc RCSName = "$Name: $";
35
36     private int order = Constants.ASCENDING_ORDER;
37
38     TupleKey(int size, int order) {
39         super(size);
40         this.order = order;
41     }
42
43     public int compareTo(Object JavaDoc obj) {
44         int retVal = 0;
45         int i = 0;
46         while (i < size() && retVal == 0) {
47             if (get(i) == null) {
48                 if (((TupleKey) obj).get(i) == null)
49                     retVal = 0;
50                 else
51                     retVal = 1;
52             } else
53                 retVal = DOMUtils.compareObjects((Comparable JavaDoc)get(i),(Comparable JavaDoc)((TupleKey) obj).get(i));
54             i++;
55         }
56         if (i == size() && order == Constants.DESCENDING_ORDER)
57             retVal = -retVal;
58         return retVal;
59     }
60
61 }
62
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