1 /*
2 * $Id: OGNLAttributeEvaluator.java 833737 2009-11-07 19:17:09Z apetrelli $
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 package org.apache.tiles.ognl;
23
24 import ognl.Ognl;
25 import ognl.OgnlException;
26
27 import org.apache.tiles.evaluator.AbstractAttributeEvaluator;
28 import org.apache.tiles.evaluator.EvaluationException;
29 import org.apache.tiles.request.Request;
30
31 /**
32 * Evaluates attribute expressions and expressions with OGNL language.
33 *
34 * @version $Rev: 833737 $ $Date: 2009-11-08 06:17:09 +1100 (Sun, 08 Nov 2009) $
35 * @since 2.2.0
36 */
37 public class OGNLAttributeEvaluator extends AbstractAttributeEvaluator {
38
39 /** {@inheritDoc} */
40 public Object evaluate(String expression, Request request) {
41 if (expression == null) {
42 throw new IllegalArgumentException("The expression parameter cannot be null");
43 }
44 try {
45 return Ognl.getValue(expression, request);
46 } catch (OgnlException e) {
47 throw new EvaluationException("Cannot evaluate OGNL expression '"
48 + expression + "'", e);
49 }
50 }
51 }