1 /* 2 * $Id: MessageHeaderExpressionEvaluator.java 11433 2008-03-20 03:43:57Z dirk.olmes $ 3 * -------------------------------------------------------------------------------------- 4 * Copyright (c) MuleSource, Inc. All rights reserved. http://www.mulesource.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.util.expression; 12 13 import org.mule.api.transport.MessageAdapter; 14 15 /** 16 * Looks up the property on the message using the property name given. 17 * 18 * @see MessageHeadersListExpressionEvaluator 19 * @see MessageHeadersExpressionEvaluator 20 * @see ExpressionEvaluator 21 * @see ExpressionEvaluatorManager 22 */ 23 public class MessageHeaderExpressionEvaluator implements ExpressionEvaluator 24 { 25 public static final String NAME = "header"; 26 27 public Object evaluate(String expression, Object message) 28 { 29 if (message instanceof MessageAdapter) 30 { 31 return ((MessageAdapter) message).getProperty(expression); 32 } 33 return null; 34 } 35 36 /** {@inheritDoc} */ 37 public String getName() 38 { 39 return NAME; 40 } 41 42 /** {@inheritDoc} */ 43 public void setName(String name) 44 { 45 throw new UnsupportedOperationException("setName"); 46 } 47 }