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.sql;
30:
31: import java.sql.SQLException;
32:
33: /**
34: * Ordering an double-valued field.
35: */
36: class DoubleOrder extends Order {
37: private int _column;
38:
39: DoubleOrder(int column) {
40: _column = column;
41: }
42:
43: public int compare(SelectResult result, int indexA, int indexB)
44: throws SQLException {
45: result.setRow(indexA);
46:
47: double valueA = result.getDouble(_column);
48: if (result.wasNull())
49: valueA = Double.MIN_VALUE;
50:
51: result.setRow(indexB);
52:
53: double valueB = result.getDouble(_column);
54: if (result.wasNull())
55: valueB = Double.MIN_VALUE;
56:
57: if (valueA < valueB)
58: return isAscending() ? -1 : 1;
59: else if (valueA == valueB)
60: return _next == null ? 0 : _next.compare(result, indexA,
61: indexB);
62: else
63: return isAscending() ? 1 : -1;
64: }
65: }
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