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.jsp.el;
30:
31: import com.caucho.el.Expr;
32:
33: import javax.servlet.jsp.PageContext;
34: import javax.servlet.jsp.el.ELException;
35: import javax.servlet.jsp.el.Expression;
36: import javax.servlet.jsp.el.VariableResolver;
37:
38: /**
39: * Implementation of the expression evaluator.
40: */
41: public class ExpressionImpl extends Expression {
42: private Expr _expr;
43:
44: /**
45: * Implements the expression.
46: */
47: ExpressionImpl(Expr expr) {
48: _expr = expr;
49: }
50:
51: /**
52: * Evaluates an expression.
53: */
54: public Object evaluate(VariableResolver resolver)
55: throws ELException {
56: if (resolver instanceof PageContext)
57: return _expr.evalObject(((PageContext) resolver)
58: .getELContext());
59: else
60: return _expr.evalObject(new ELContextAdapter(resolver));
61: }
62: }
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