org.mule.transformer.simple

Class ExpressionTransformer

java.lang.Object

org.mule.transformer.AbstractTransformer

org.mule.transformer.AbstractMessageAwareTransformer

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

• headers (single, map or list)
• attachments (single, map or list)
• payload
• xpath
• groovy
• bean

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

Nested Classes

Modifier and Type	Class and Description
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

Constructors

Constructor and Description
ExpressionTransformer()

Method Summary

Methods

Modifier and Type	Method and Description
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)