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OGNLAttributeEvaluator xref
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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  }