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Java > Open Source Codes > com > caucho > db > index > KeyCompare


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.db.index;
30
31 /**
32  * Compares two keys.
33  */
34 public class KeyCompare {
35   /**
36    * Compares the key to the block data.
37    */
38   public int compare(byte []keyBuffer, int keyOffset,
39                       byte []block, int offset, int length)
40   {
41     for (; length > 0; length--) {
42       byte keyByte = keyBuffer[keyOffset++];
43       byte blockByte = block[offset++];
44
45       if (keyByte < blockByte)
46         return -1;
47       else if (blockByte < keyByte)
48         return 1;
49     }
50
51     return 0;
52   }
53
54   public String JavaDoc toString(byte []buffer, int offset, int length)
55   {
56     StringBuilder JavaDoc sb = new StringBuilder JavaDoc();
57
58     for (int j = 0; j < length; j++) {
59       int ch = buffer[offset + j];
60
61       if (ch == 0)
62     break;
63       
64       sb.append((char) ch);
65     }
66
67     return sb.toString();
68   }
69 }
70
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