/*
* $Id: OGNLAttributeEvaluator.java 817009 2009-09-20 11:26:26Z 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.ognl;
import java.util.Map;
import ognl.Ognl;
import ognl.OgnlException;
import org.apache.tiles.context.TilesRequestContext;
import org.apache.tiles.evaluator.AbstractAttributeEvaluator;
import org.apache.tiles.evaluator.EvaluationException;
/**
* Evaluates attribute expressions and expressions with OGNL language.
*
* @version $Rev: 817009 $ $Date: 2009-09-20 13:26:26 +0200 (dom, 20 set 2009) $
* @since 2.2.0
*/
public class OGNLAttributeEvaluator extends AbstractAttributeEvaluator {
/** {@inheritDoc} */
public Object evaluate(String expression, TilesRequestContext request) {
if (expression == null) {
throw new IllegalArgumentException("The expression parameter cannot be null");
}
try {
return Ognl.getValue(expression, request);
} catch (OgnlException e) {
throw new EvaluationException("Cannot evaluate OGNL expression '"
+ expression + "'", e);
}
}
/** {@inheritDoc} */
public void init(Map<String, String> initParameters) {
// Nothing to initialize.
}
}