org.springframework.mock.web.MockExpressionEvaluator Maven / Gradle / Ivy
/*
* Copyright 2002-2006 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;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.el.ELException;
import javax.servlet.jsp.el.Expression;
import javax.servlet.jsp.el.ExpressionEvaluator;
import javax.servlet.jsp.el.FunctionMapper;
import javax.servlet.jsp.el.VariableResolver;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
/**
* Mock implementation of the JSP 2.0 {@link javax.servlet.jsp.el.ExpressionEvaluator}
* interface, delegating to the Jakarta JSTL ExpressionEvaluatorManager.
*
* Used for testing the web framework; only necessary for testing
* applications when testing custom JSP tags.
*
*
Note that the Jakarta 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
*/
public class MockExpressionEvaluator extends 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;
}
public Expression parseExpression(
final String expression, final Class expectedType, final FunctionMapper functionMapper)
throws ELException {
return new Expression() {
public Object evaluate(VariableResolver variableResolver) throws ELException {
return doEvaluate(expression, expectedType, functionMapper);
}
};
}
public Object evaluate(
String expression, Class expectedType, VariableResolver variableResolver, FunctionMapper functionMapper)
throws ELException {
if (variableResolver != null) {
throw new IllegalArgumentException("Custom VariableResolver not supported");
}
return doEvaluate(expression, expectedType, functionMapper);
}
protected Object doEvaluate(
String expression, Class expectedType, FunctionMapper functionMapper)
throws ELException {
if (functionMapper != null) {
throw new IllegalArgumentException("Custom FunctionMapper not supported");
}
try {
return ExpressionEvaluatorManager.evaluate("JSP EL expression", expression, expectedType, this.pageContext);
}
catch (JspException ex) {
throw new ELException("Parsing of JSP EL expression \"" + expression + "\" failed", ex);
}
}
}