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 long keys.
33: */
34: public class LongKeyCompare extends KeyCompare {
35: /**
36: * Compares the key to the block data.
37: */
38: @Override
39: public int compare(byte[] keyBuffer, int keyOffset, byte[] block,
40: int offset, int length) {
41: long key = (((keyBuffer[keyOffset + 0] & 0xffL) << 56)
42: + ((keyBuffer[keyOffset + 1] & 0xffL) << 48)
43: + ((keyBuffer[keyOffset + 2] & 0xffL) << 40)
44: + ((keyBuffer[keyOffset + 3] & 0xffL) << 32) +
45:
46: ((keyBuffer[keyOffset + 4] & 0xffL) << 24)
47: + ((keyBuffer[keyOffset + 5] & 0xffL) << 16)
48: + ((keyBuffer[keyOffset + 6] & 0xffL) << 8) + ((keyBuffer[keyOffset + 7] & 0xffL) << 0));
49:
50: long value = (((block[offset + 0] & 0xffL) << 56)
51: + ((block[offset + 1] & 0xffL) << 48)
52: + ((block[offset + 2] & 0xffL) << 40)
53: + ((block[offset + 3] & 0xffL) << 32) +
54:
55: ((block[offset + 4] & 0xffL) << 24)
56: + ((block[offset + 5] & 0xffL) << 16)
57: + ((block[offset + 6] & 0xffL) << 8) + ((block[offset + 7] & 0xffL) << 0));
58:
59: if (key == value)
60: return 0;
61: else if (key < value)
62: return -1;
63: else
64: return 1;
65: }
66:
67: /**
68: * Compares the key to the block data.
69: */
70: @Override
71: public String toString(byte[] keyBuffer, int keyOffset, int length) {
72: long key = (((keyBuffer[keyOffset + 0] & 0xffL) << 56)
73: + ((keyBuffer[keyOffset + 1] & 0xffL) << 48)
74: + ((keyBuffer[keyOffset + 2] & 0xffL) << 40)
75: + ((keyBuffer[keyOffset + 3] & 0xffL) << 32) +
76:
77: ((keyBuffer[keyOffset + 4] & 0xffL) << 24)
78: + ((keyBuffer[keyOffset + 5] & 0xffL) << 16)
79: + ((keyBuffer[keyOffset + 6] & 0xffL) << 8) + ((keyBuffer[keyOffset + 7] & 0xffL) << 0));
80:
81: return String.valueOf(key);
82: }
83: }
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