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1   /*
2    * $Id: ExpressionEvaluatorProcessor.java 11282 2008-03-08 21:08:08Z rossmason $
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  package org.mule.registry;
11  
12  import org.mule.api.lifecycle.Disposable;
13  import org.mule.api.registry.ObjectProcessor;
14  import org.mule.util.expression.ExpressionEvaluator;
15  import org.mule.util.expression.ExpressionEvaluatorManager;
16  
17  /** 
18   * Registers ExpressionEvaluators with the {@link org.mule.util.expression.ExpressionEvaluatorManager} so that they will
19   * be resolved at run-time.
20   * {@link org.mule.util.expression.ExpressionEvaluator} objects are used to execute property expressions (usually on the
21   * current message) at run-time to extract a dynamic value.
22   */
23  public class ExpressionEvaluatorProcessor implements ObjectProcessor, Disposable
24  {
25      public ExpressionEvaluatorProcessor()
26      {
27          ExpressionEvaluatorManager.clearEvaluators();
28      }
29  
30      public Object process(Object object)
31      {
32          if(object instanceof ExpressionEvaluator)
33          {
34              ExpressionEvaluatorManager.registerEvaluator((ExpressionEvaluator)object);
35          }
36          return object;
37      }
38  
39      /**
40       * A lifecycle method where implementor should free up any resources. If an
41       * exception is thrown it should just be logged and processing should continue.
42       * This method should not throw Runtime exceptions.
43       */
44      public void dispose()
45      {
46          ExpressionEvaluatorManager.clearEvaluators();
47      }
48  }