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1   /*
2    * $Id: BankQuotesAggregationLogic.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.example.loanbroker.routers;
12  
13  import org.mule.DefaultMuleEvent;
14  import org.mule.DefaultMuleMessage;
15  import org.mule.api.MuleEvent;
16  import org.mule.example.loanbroker.LocaleMessage;
17  import org.mule.example.loanbroker.messages.LoanQuote;
18  import org.mule.routing.EventGroup;
19  
20  import java.util.Iterator;
21  
22  import org.apache.commons.logging.Log;
23  import org.apache.commons.logging.LogFactory;
24  
25  public class BankQuotesAggregationLogic
26  {
27      /**
28       * logger used by this class
29       */
30      protected static final Log logger = LogFactory.getLog(BankQuotesAggregationLogic.class);
31      
32      public static MuleEvent aggregateEvents(EventGroup events) throws Exception
33      {
34          LoanQuote lowestQuote = null;
35          LoanQuote quote = null;
36          MuleEvent event = null;
37  
38          for (Iterator iterator = events.iterator(); iterator.hasNext();)
39          {
40              event = (MuleEvent)iterator.next();
41              Object o = event.getMessage().getPayload();
42              if(o instanceof LoanQuote)
43              {
44                  quote = (LoanQuote)o;
45              }
46              else
47              {
48                  throw new IllegalArgumentException("Object received by Aggregator is not of expected type. Wanted: "
49                          + LoanQuote.class.getName() + " Got: " + o);
50              }
51              logger.info(LocaleMessage.processingQuote(quote));
52  
53              if (lowestQuote == null)
54              {
55                  lowestQuote = quote;
56              }
57              else
58              {
59                  if (quote.getInterestRate() < lowestQuote.getInterestRate())
60                  {
61                      lowestQuote = quote;
62                  }
63              }
64          }
65  
66          logger.info(LocaleMessage.lowestQuote(lowestQuote));
67          return new DefaultMuleEvent(new DefaultMuleMessage(lowestQuote, event.getMessage(),
68              event.getMuleContext()), event);
69      }
70  }