org.mule.expression.transformers
Class ExpressionTransformer

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

All Implemented Interfaces:

MuleContextAware, Initialisable, NamedObject, BaseTransformer, Transformer

public class ExpressionTransformer
extends AbstractExpressionTransformer

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

Fields inherited from class org.mule.expression.transformers.AbstractExpressionTransformer

arguments, 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

ExpressionTransformer()

Method Summary

boolean	isReturnSourceIfNull()
void	setReturnSourceIfNull(boolean returnSourceIfNull)
Object	transform(MuleMessage message, String outputEncoding)

Methods inherited from class org.mule.expression.transformers.AbstractExpressionTransformer

addArgument, getArguments, initialise, removeArgument, setArguments, setMuleContext

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

transform

public Object transform(MuleMessage message,
                        String outputEncoding)
                 throws TransformerException

Specified by:

transform in class AbstractMessageAwareTransformer

Throws:

TransformerException

isReturnSourceIfNull

public boolean isReturnSourceIfNull()

setReturnSourceIfNull

public void setReturnSourceIfNull(boolean returnSourceIfNull)