org.mule.expression.transformers
Class AbstractExpressionTransformer

java.lang.Object
  org.mule.transformer.AbstractTransformer
      org.mule.transformer.AbstractMessageAwareTransformer
          org.mule.expression.transformers.AbstractExpressionTransformer

All Implemented Interfaces:

MuleContextAware, Initialisable, NamedObject, BaseTransformer, Transformer

Direct Known Subclasses:

BeanBuilderTransformer, ExpressionTransformer

public abstract class AbstractExpressionTransformer
extends AbstractMessageAwareTransformer
implements MuleContextAware

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.

Field Summary

protected List<ExpressionArgument>	arguments
protected static MuleContext	muleContext

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

AbstractExpressionTransformer()

Method Summary

void	addArgument(ExpressionArgument argument)
List<ExpressionArgument>	getArguments()
void	initialise() Template method were deriving classes can do any initialisation after the properties have been set on this transformer
boolean	removeArgument(ExpressionArgument argument)
void	setArguments(List<ExpressionArgument> arguments)
void	setMuleContext(MuleContext context)

Methods inherited from class org.mule.transformer.AbstractMessageAwareTransformer

doTransform, isSourceTypeSupported, transform

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

Field Detail

arguments

protected List<ExpressionArgument> arguments

muleContext

protected static MuleContext muleContext

Constructor Detail

AbstractExpressionTransformer

public AbstractExpressionTransformer()

Method Detail

setMuleContext

public void setMuleContext(MuleContext context)

Specified by:

setMuleContext in interface MuleContextAware

addArgument

public void addArgument(ExpressionArgument argument)

removeArgument

public boolean removeArgument(ExpressionArgument 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

getArguments

public List<ExpressionArgument> getArguments()

setArguments

public void setArguments(List<ExpressionArgument> arguments)