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7 package org.mule.expression;
8
9 import org.mule.api.MuleContext;
10 import org.mule.api.MuleMessage;
11 import org.mule.api.MuleRuntimeException;
12 import org.mule.api.context.MuleContextAware;
13 import org.mule.api.expression.ExpressionEvaluator;
14 import org.mule.api.transformer.DataType;
15 import org.mule.api.transformer.TransformerException;
16 import org.mule.config.i18n.CoreMessages;
17 import org.mule.transformer.types.DataTypeFactory;
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, MuleContextAware
44 {
45 public static final String NAME = "payload";
46 public static final String BYTE_ARRAY = "byte[]";
47
48
49
50
51 protected transient final Log logger = LogFactory.getLog(MessagePayloadExpressionEvaluator.class);
52
53 protected MuleContext muleContext;
54
55 public void setMuleContext(MuleContext context)
56 {
57 this.muleContext = context;
58 }
59
60 public Object evaluate(String expression, MuleMessage message)
61 {
62 if(message==null) return null;
63
64 if (StringUtils.isEmpty(expression))
65 {
66 return message.getPayload();
67 }
68 else
69 {
70 try
71 {
72 if (expression.equals(BYTE_ARRAY))
73 {
74 return message.getPayload(DataType.BYTE_ARRAY_DATA_TYPE);
75 }
76 else
77 {
78 return message.getPayload(DataTypeFactory.create(ClassUtils.loadClass(expression, getClass())));
79 }
80 }
81 catch (TransformerException e)
82 {
83 throw new MuleRuntimeException(CoreMessages.failedToProcessExtractorFunction(expression), e);
84 }
85 catch (ClassNotFoundException e)
86 {
87 throw new MuleRuntimeException(CoreMessages.failedToProcessExtractorFunction(expression), e);
88 }
89 }
90 }
91
92
93
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95 public String getName()
96 {
97 return NAME;
98 }
99
100
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102
103 public void setName(String name)
104 {
105 throw new UnsupportedOperationException();
106 }
107 }