org.mule.transformer.simple
Class ExpressionTransformer

java.lang.Object
  extended by org.mule.transformer.AbstractTransformer
      extended by org.mule.transformer.AbstractMessageAwareTransformer
          extended by org.mule.transformer.simple.ExpressionTransformer
All Implemented Interfaces:
Initialisable, NamedObject, BaseTransformer, Transformer

public class ExpressionTransformer
extends AbstractMessageAwareTransformer

This transformer will evaluate one or more expressions on the current message and return the results as an Array. If only one expression is defined it will return the object returned from the expression.

You can use expressions to extract

and more.

This transformer provides a very powerful way to pull different bits of information from the message and pass them to the service.


Nested Class Summary
static class ExpressionTransformer.Argument
           
 
Field Summary
 
Fields inherited from class org.mule.transformer.AbstractTransformer
DEFAULT_TRUNCATE_LENGTH, endpoint, logger, name, returnClass, sourceTypes
 
Fields inherited from interface org.mule.api.lifecycle.Initialisable
PHASE_NAME
 
Constructor Summary
ExpressionTransformer()
           
 
Method Summary
 void addArgument(ExpressionTransformer.Argument argument)
           
 List getArguments()
           
 void initialise()
          Template method were deriving classes can do any initialisation after the properties have been set on this transformer
 boolean isReturnSourceIfNull()
           
 boolean removeArgument(ExpressionTransformer.Argument argument)
           
 void setArguments(List arguments)
           
 void setReturnSourceIfNull(boolean returnSourceIfNull)
           
 Object transform(MuleMessage message, String outputEncoding)
           
 
Methods inherited from class org.mule.transformer.AbstractMessageAwareTransformer
doTransform, isSourceTypeSupported
 
Methods inherited from class org.mule.transformer.AbstractTransformer
checkReturnClass, generateTransformerName, getEndpoint, getName, getReturnClass, getSourceTypes, isAcceptNull, isConsumed, isIgnoreBadInput, isSourceTypeSupported, registerSourceType, setEndpoint, setIgnoreBadInput, setName, setReturnClass, toString, transform, unregisterSourceType
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

ExpressionTransformer

public ExpressionTransformer()
Method Detail

addArgument

public void addArgument(ExpressionTransformer.Argument argument)

removeArgument

public boolean removeArgument(ExpressionTransformer.Argument argument)

initialise

public void initialise()
                throws InitialisationException
Template method were deriving classes can do any initialisation after the properties have been set on this transformer

Specified by:
initialise in interface Initialisable
Overrides:
initialise in class AbstractTransformer
Throws:
InitialisationException
RecoverableException - if an error occurs that can be recovered from

transform

public Object transform(MuleMessage message,
                        String outputEncoding)
                 throws TransformerException
Specified by:
transform in class AbstractMessageAwareTransformer
Throws:
TransformerException

getArguments

public List getArguments()

setArguments

public void setArguments(List arguments)

isReturnSourceIfNull

public boolean isReturnSourceIfNull()

setReturnSourceIfNull

public void setReturnSourceIfNull(boolean returnSourceIfNull)


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