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11 package org.mule.util.expression;
12
13 import org.mule.api.MuleMessage;
14 import org.mule.api.MuleRuntimeException;
15 import org.mule.api.transformer.TransformerException;
16 import org.mule.api.transport.MessageAdapter;
17 import org.mule.config.i18n.CoreMessages;
18 import org.mule.util.ClassUtils;
19 import org.mule.util.StringUtils;
20
21 import org.apache.commons.logging.Log;
22 import org.apache.commons.logging.LogFactory;
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43 public class MessagePayloadExpressionEvaluator implements ExpressionEvaluator
44 {
45 public static final String NAME = "payload";
46 public static final String BYTE_ARRAY = "byte[]";
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48
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50
51 protected transient final Log logger = LogFactory.getLog(MessagePayloadExpressionEvaluator.class);
52
53 public Object evaluate(String expression, Object message)
54 {
55 if (message instanceof MuleMessage)
56 {
57 if (StringUtils.isEmpty(expression))
58 {
59 return ((MuleMessage) message).getPayload();
60 }
61 else
62 {
63 try
64 {
65 if (expression.equals(BYTE_ARRAY))
66 {
67 return ((MuleMessage) message).getPayload(byte[].class);
68 }
69 else
70 {
71 return ((MuleMessage) message).getPayload(ClassUtils.loadClass(expression, getClass()));
72 }
73 }
74 catch (TransformerException e)
75 {
76 throw new MuleRuntimeException(CoreMessages.failedToProcessExtractorFunction(expression), e);
77 }
78 catch (ClassNotFoundException e)
79 {
80 throw new MuleRuntimeException(CoreMessages.failedToProcessExtractorFunction(expression), e);
81 }
82 }
83 }
84 else
85 {
86 logger.warn("Message is not of type MuleMessage, the expression will return the object without modification");
87 if (message instanceof MessageAdapter)
88 {
89 return ((MessageAdapter) message).getPayload();
90 }
91 }
92 return message;
93
94 }
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99 public String getName()
100 {
101 return NAME;
102 }
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107 public void setName(String name)
108 {
109 throw new UnsupportedOperationException("setName");
110 }
111 }