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1   /*
2    * $Id: MessageHeaderExpressionEvaluator.java 19191 2010-08-25 21:05:23Z tcarlson $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  
11  package org.mule.expression;
12  
13  import org.mule.api.MuleMessage;
14  import org.mule.api.expression.ExpressionEvaluator;
15  
16  /**
17   * Looks up the property on the message using the property name given.  If the call on the messgae returns null,
18   * parameters on the inbound endpoint will also be checked.
19   *
20   * @see MessageHeadersListExpressionEvaluator
21   * @see MessageHeadersExpressionEvaluator
22   * @see ExpressionEvaluator
23   * @see DefaultExpressionManager
24   */
25  public class MessageHeaderExpressionEvaluator implements ExpressionEvaluator, ExpressionConstants
26  {
27      public static final String NAME = "header";
28  
29      public Object evaluate(String expression, MuleMessage message)
30      {
31          return ExpressionUtils.getPropertyWithScope(expression, message);
32      }
33  
34      /**
35       * {@inheritDoc}
36       */
37      public String getName()
38      {
39          return NAME;
40      }
41  
42      /**
43       * {@inheritDoc}
44       */
45      public void setName(String name)
46      {
47          throw new UnsupportedOperationException();
48      }
49  }