/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.jsp.el;
import com.caucho.el.Expr;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.el.ELException;
import javax.servlet.jsp.el.Expression;
import javax.servlet.jsp.el.VariableResolver;
/**
* Implementation of the expression evaluator.
*/
public class ExpressionImpl extends Expression {
private Expr _expr;
/**
* Implements the expression.
*/
ExpressionImpl(Expr expr)
{
_expr = expr;
}
/**
* Evaluates an expression.
*/
public Object evaluate(VariableResolver resolver)
throws ELException
{
if (resolver instanceof PageContext)
return _expr.evalObject(((PageContext) resolver).getELContext());
else
return _expr.evalObject(new ELContextAdapter(resolver));
}
}