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 com.caucho.log.Log;
32:
33: import java.sql.SQLException;
34: import java.util.ArrayList;
35: import java.util.logging.Logger;
36:
37: class BinaryEqExpr extends Expr {
38: private static final Logger log = Log.open(BinaryEqExpr.class);
39:
40: private ColumnExpr _column;
41: private byte[] _matchBuffer;
42:
43: BinaryEqExpr(ColumnExpr left, StringExpr right) {
44: _column = left;
45:
46: try {
47: _matchBuffer = right.getValue().getBytes("UTF8");
48: } catch (Exception e) {
49: throw new RuntimeException(e);
50: }
51: }
52:
53: protected Expr bind(Query query) throws SQLException {
54: throw new UnsupportedOperationException();
55: }
56:
57: /**
58: * Returns the type of the expression.
59: */
60: public Class getType() {
61: return boolean.class;
62: }
63:
64: /**
65: * Returns the cost based on the given FromList.
66: */
67: public long subCost(ArrayList<FromItem> fromList) {
68: return _column.subCost(fromList);
69: }
70:
71: /**
72: * Evaluates the expression as a boolean.
73: */
74: public int evalBoolean(QueryContext context) throws SQLException {
75: if (_column.isNull(context))
76: return UNKNOWN;
77: else
78: return _column.evalEqual(context, _matchBuffer) ? TRUE
79: : FALSE;
80: }
81:
82: public String evalString(QueryContext context) throws SQLException {
83: throw new SQLException("can't convert string to boolean");
84: }
85:
86: public String toString() {
87: return "(" + _column + " = byte[])";
88: }
89: }
|