/*
* $Id: MultiversionExpressionFactoryFactory.java 674916 2008-07-08 19:06:05Z apetrelli $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tiles.test.evaluator.el;
import javax.el.ExpressionFactory;
import javax.servlet.jsp.JspFactory;
import org.apache.el.ExpressionFactoryImpl;
import org.apache.tiles.jsp.evaluator.el.JspExpressionFactoryFactory;
/**
* Tries to use JSP 2.1 expression factory first, then Tomcat one.
*
* @version $Rev: 674916 $ $Date: 2008-07-08 21:06:05 +0200 (Tue, 08 Jul 2008) $
*/
public class MultiversionExpressionFactoryFactory extends
JspExpressionFactoryFactory {
/**
* Minimum servlet version major number.
*/
private static final int MINIMUM_SERVLET_VERSION_MAJOR = 2;
/**
* Minimum servlet version minor number.
*/
private static final int MINIMUM_SERVLET_VERSION_MINOR = 5;
/** {@inheritDoc} */
@Override
public ExpressionFactory getExpressionFactory() {
ExpressionFactory efFactory;
if (servletContext.getMajorVersion() > MINIMUM_SERVLET_VERSION_MAJOR
|| (servletContext.getMajorVersion() == MINIMUM_SERVLET_VERSION_MAJOR && servletContext
.getMinorVersion() >= MINIMUM_SERVLET_VERSION_MINOR)) {
efFactory = JspFactory.getDefaultFactory().getJspApplicationContext(
servletContext).getExpressionFactory();
} else {
efFactory = new ExpressionFactoryImpl();
}
return efFactory;
}
}