01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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, byte[] block,
39: int offset, int length) {
40: for (; length > 0; length--) {
41: byte keyByte = keyBuffer[keyOffset++];
42: byte blockByte = block[offset++];
43:
44: if (keyByte < blockByte)
45: return -1;
46: else if (blockByte < keyByte)
47: return 1;
48: }
49:
50: return 0;
51: }
52:
53: public String toString(byte[] buffer, int offset, int length) {
54: StringBuilder sb = new StringBuilder();
55:
56: for (int j = 0; j < length; j++) {
57: int ch = buffer[offset + j];
58:
59: if (ch == 0)
60: break;
61:
62: sb.append((char) ch);
63: }
64:
65: return sb.toString();
66: }
67: }
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