/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed 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.springframework.mock.web.test;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
import org.springframework.util.Assert;
/**
* Mock implementation of the JSP 2.0 {@link javax.servlet.jsp.el.ExpressionEvaluator}
* interface, delegating to the Apache JSTL ExpressionEvaluatorManager.
* Only necessary for testing applications when testing custom JSP tags.
*
* <p>Note that the Apache JSTL implementation (jstl.jar, standard.jar) has to be
* available on the class path to use this expression evaluator.
*
* @author Juergen Hoeller
* @since 1.1.5
* @see org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager
*/
@SuppressWarnings("deprecation")
public class MockExpressionEvaluator extends javax.servlet.jsp.el.ExpressionEvaluator {
private final PageContext pageContext;
/**
* Create a new MockExpressionEvaluator for the given PageContext.
* @param pageContext the JSP PageContext to run in
*/
public MockExpressionEvaluator(PageContext pageContext) {
this.pageContext = pageContext;
}
@Override
@SuppressWarnings("rawtypes")
public javax.servlet.jsp.el.Expression parseExpression(final String expression, final Class expectedType,
final javax.servlet.jsp.el.FunctionMapper functionMapper) throws javax.servlet.jsp.el.ELException {
return new javax.servlet.jsp.el.Expression() {
@Override
public Object evaluate(javax.servlet.jsp.el.VariableResolver variableResolver) throws javax.servlet.jsp.el.ELException {
return doEvaluate(expression, expectedType, functionMapper);
}
};
}
@Override
@SuppressWarnings("rawtypes")
public Object evaluate(String expression, Class expectedType, javax.servlet.jsp.el.VariableResolver variableResolver,
javax.servlet.jsp.el.FunctionMapper functionMapper) throws javax.servlet.jsp.el.ELException {
Assert.isNull(variableResolver, "Custom VariableResolver not supported");
return doEvaluate(expression, expectedType, functionMapper);
}
@SuppressWarnings("rawtypes")
protected Object doEvaluate(String expression, Class expectedType, javax.servlet.jsp.el.FunctionMapper functionMapper)
throws javax.servlet.jsp.el.ELException {
Assert.isNull(functionMapper, "Custom FunctionMapper not supported");
try {
return ExpressionEvaluatorManager.evaluate("JSP EL expression", expression, expectedType, this.pageContext);
}
catch (JspException ex) {
throw new javax.servlet.jsp.el.ELException("Parsing of JSP EL expression \"" + expression + "\" failed", ex);
}
}
}