/*
* 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 Software Foundation, 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.el.ELContext;
import javax.el.ELResolver;
import javax.servlet.jsp.el.Expression;
import javax.servlet.jsp.el.ExpressionEvaluator;
import javax.servlet.jsp.el.FunctionMapper;
import java.lang.reflect.Method;
/**
* Implementation of the expression evaluator.
*/
public class ExpressionEvaluatorImpl extends ExpressionEvaluator {
private ELContext _elContext;
/**
* Creates the expression evaluator.
*/
public ExpressionEvaluatorImpl(ELContext elContext)
{
_elContext = elContext;
}
/**
* Evaluates an expression.
*/
public Object evaluate(String expression, Class expectedType,
javax.servlet.jsp.el.VariableResolver resolver,
FunctionMapper funMapper)
throws javax.servlet.jsp.el.ELException
{
Expression expr = parseExpression(expression, expectedType, funMapper);
return expr.evaluate(resolver);
}
/**
* Parses an expression.
*/
public Expression parseExpression(String expression,
Class expectedType,
FunctionMapper funMapper)
throws javax.servlet.jsp.el.ELException
{
ELContext elContext;
if (funMapper != null)
elContext = new ParseELContext(funMapper);
else
elContext = _elContext;
JspELParser parser = new JspELParser(elContext, expression);
// parser.setFunctionMapper(funMapper);
try {
Expr expr = parser.parse();
return new ExpressionImpl(expr);
} catch (com.caucho.el.ELParseException e) {
throw new javax.servlet.jsp.el.ELParseException(e.getMessage());
}
}
public class ParseELContext extends ELContext
{
private javax.el.FunctionMapper _funMapper;
ParseELContext(FunctionMapper funMapper)
{
_funMapper = new FunctionMapperAdapter(funMapper);
}
public ELResolver getELResolver()
{
return _elContext.getELResolver();
}
public javax.el.FunctionMapper getFunctionMapper()
{
return _funMapper;
}
public javax.el.VariableMapper getVariableMapper()
{
return _elContext.getVariableMapper();
}
}
public class FunctionMapperAdapter extends javax.el.FunctionMapper
{
private FunctionMapper _funMap;
FunctionMapperAdapter(FunctionMapper funMap)
{
_funMap = funMap;
}
public Method resolveFunction(String prefix, String localName)
{
return _funMap.resolveFunction(prefix, localName);
}
}
}