Coverage Report - org.mule.expression.MessageProcessorExpressionEvaluator
 
Classes in this File Line Coverage Branch Coverage Complexity
MessageProcessorExpressionEvaluator
0%
0/28
0%
0/12
3.4
 
 1  
 /*
 2  
  * $Id: MessageProcessorExpressionEvaluator.java 20320 2010-11-24 15:03:31Z dfeist $
 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.DefaultMuleEvent;
 14  
 import org.mule.DefaultMuleMessage;
 15  
 import org.mule.RequestContext;
 16  
 import org.mule.api.MuleContext;
 17  
 import org.mule.api.MuleException;
 18  
 import org.mule.api.MuleMessage;
 19  
 import org.mule.api.expression.ExpressionEvaluator;
 20  
 import org.mule.api.expression.ExpressionRuntimeException;
 21  
 import org.mule.api.processor.MessageProcessor;
 22  
 import org.mule.config.i18n.CoreMessages;
 23  
 import org.mule.util.StringUtils;
 24  
 
 25  
 import org.apache.commons.logging.Log;
 26  
 import org.apache.commons.logging.LogFactory;
 27  
 
 28  
 /**
 29  
  * Returns the message result of invoking the specified globally accessible message
 30  
  * processor. If just the message processor name is specified then the current
 31  
  * message is used. If a nested expression is specified then this is first evaluated
 32  
  * and the result of this evaluation used when invoking the message processor
 33  
  * <b>Example:</b>
 34  
  * <ul>
 35  
  * <li><b>"StringToMyObjext"</b> - invokes the 'StringToMyObjext' transformer using
 36  
  * the current message</li>
 37  
  * <li><b>"StringToMyObjext:header:one"</b> - invokes the 'StringToMyObjext'
 38  
  * transformerusing the value of the outbound header 'one'</li>
 39  
  * <li><b>"thatFlow:xpath://my/path"</b> - invokes the 'thatFlow' flow using the
 40  
  * result of the xpath evaluation</li>
 41  
  * </ul>
 42  
  * If no expression is set the MuleMessage itself will be returned.
 43  
  * <p/>
 44  
  * 
 45  
  * @see ExpressionEvaluator
 46  
  * @see DefaultExpressionManager
 47  
  */
 48  0
 public class MessageProcessorExpressionEvaluator implements ExpressionEvaluator
 49  
 {
 50  0
     protected transient Log logger = LogFactory.getLog(MessageProcessorExpressionEvaluator.class);
 51  
 
 52  
     public static final String NAME = "process";
 53  
 
 54  
     public Object evaluate(String expression, MuleMessage message)
 55  
     {
 56  0
         MuleContext muleContext = message.getMuleContext();
 57  
 
 58  
         String processorName;
 59  0
         String processorArgExpression = null;
 60  0
         MuleMessage messageToProcess = message;
 61  
 
 62  0
         if (StringUtils.isBlank(expression))
 63  
         {
 64  0
             return message;
 65  
         }
 66  
 
 67  0
         boolean isNestedExpression = expression.indexOf(':') > 0;
 68  0
         if (!isNestedExpression)
 69  
         {
 70  0
             processorName = expression;
 71  
         }
 72  
         else
 73  
         {
 74  0
             processorName = expression.substring(0, expression.indexOf(':'));
 75  0
             processorArgExpression = expression.substring(expression.indexOf(':') + 1, expression.length());
 76  
         }
 77  
 
 78  0
         if (processorArgExpression != null)
 79  
         {
 80  0
             messageToProcess = evaluateProcessorArgument(message, processorArgExpression);
 81  
         }
 82  
 
 83  0
         MessageProcessor processor = lookupMessageProcessor(processorName, muleContext);
 84  
 
 85  
         try
 86  
         {
 87  0
             return processor.process(new DefaultMuleEvent(messageToProcess, RequestContext.getEvent()))
 88  
                 .getMessage();
 89  
         }
 90  0
         catch (MuleException e)
 91  
         {
 92  0
             throw new ExpressionRuntimeException(
 93  
                 CoreMessages.createStaticMessage("Exception invoking MessageProcessor '" + processorName
 94  
                                                  + "'"), e);
 95  
         }
 96  
     }
 97  
 
 98  
     protected MessageProcessor lookupMessageProcessor(String processorName, MuleContext muleContext)
 99  
     {
 100  0
         Object processor = muleContext.getRegistry().lookupObject(processorName);
 101  
 
 102  0
         if (!(processor instanceof MessageProcessor))
 103  
         {
 104  0
             throw new ExpressionRuntimeException(CoreMessages.createStaticMessage("No MessageProcessor '"
 105  
                                                                                   + processorName
 106  
                                                                                   + "' found."));
 107  
         }
 108  0
         return (MessageProcessor) processor;
 109  
     }
 110  
 
 111  
     protected MuleMessage evaluateProcessorArgument(MuleMessage message, String processorArgExpression)
 112  
     {
 113  0
         Object result = message.getMuleContext().getExpressionManager().evaluate(processorArgExpression,
 114  
             message);
 115  0
         if (result instanceof MuleMessage)
 116  
         {
 117  0
             return (MuleMessage) result;
 118  
         }
 119  
         else
 120  
         {
 121  0
             return new DefaultMuleMessage(result, message.getMuleContext());
 122  
         }
 123  
     }
 124  
 
 125  
     /**
 126  
      * {@inheritDoc}
 127  
      */
 128  
     public String getName()
 129  
     {
 130  0
         return NAME;
 131  
     }
 132  
 
 133  
     /**
 134  
      * {@inheritDoc}
 135  
      */
 136  
     public void setName(String name)
 137  
     {
 138  0
         throw new UnsupportedOperationException();
 139  
     }
 140  
 }