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: *
23: * Free Software Foundation, Inc.
24: * 59 Temple Place, Suite 330
25: * Boston, MA 02111-1307 USA
26: *
27: * @author Scott Ferguson
28: */
29:
30: package com.caucho.el;
31:
32: import com.caucho.util.L10N;
33:
34: import javax.el.ELContext;
35: import javax.el.ELException;
36: import javax.el.PropertyNotFoundException;
37: import java.util.logging.Logger;
38:
39: /**
40: * Abstract implementation class for an expression.
41: */
42: public class BooleanValueExpression extends AbstractValueExpression {
43: protected static final Logger log = Logger
44: .getLogger(BooleanValueExpression.class.getName());
45: protected static final L10N L = new L10N(
46: BooleanValueExpression.class);
47:
48: private Class _expectedType;
49:
50: public BooleanValueExpression(Expr expr, String expressionString,
51: Class expectedType) {
52: super (expr, expressionString);
53:
54: _expectedType = expectedType;
55: }
56:
57: public BooleanValueExpression(Expr expr, String expressionString) {
58: super (expr, expressionString);
59: }
60:
61: public BooleanValueExpression(Expr expr) {
62: super (expr);
63: }
64:
65: private BooleanValueExpression() {
66: }
67:
68: @Override
69: public Class<?> getExpectedType() {
70: if (_expectedType != null)
71: return _expectedType;
72: else
73: return Boolean.class;
74: }
75:
76: @Override
77: public Object getValue(ELContext context)
78: throws PropertyNotFoundException, ELException {
79: return new Boolean(_expr.evalBoolean(context));
80: }
81: }
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