org.mule.registry

Class TypeBasedTransformerResolver

java.lang.Object

org.mule.registry.TypeBasedTransformerResolver

All Implemented Interfaces:

MuleContextAware, Disposable, Initialisable, TransformerResolver

public class TypeBasedTransformerResolver
extends Object
implements TransformerResolver, MuleContextAware, Disposable, Initialisable

Will discover transformers based on type information only. It looks for transformers that support the source and result types passed into the method. This resolver only resolves on the first source type, which is the way transformer resolution working in Mule 2.x.

Nested Class Summary

Nested classes/interfaces inherited from interface org.mule.api.registry.TransformerResolver

TransformerResolver.RegistryAction

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<String,Transformer>	exactTransformerCache
protected TransformerResolver	graphTransformerResolver
protected org.apache.commons.logging.Log	logger logger used by this class

Fields inherited from interface org.mule.api.lifecycle.Disposable

PHASE_NAME

Fields inherited from interface org.mule.api.lifecycle.Initialisable

PHASE_NAME

Constructor Summary

Constructors

Constructor and Description
TypeBasedTransformerResolver()

Method Summary

Methods

Modifier and Type	Method and Description
void	dispose() A lifecycle method where implementor should free up any resources.
protected Transformer	getNearestTransformerMatch(List<Transformer> trans, Class input, Class output)
void	initialise() Method used to perform any initialisation work.
Transformer	resolve(DataType source, DataType result) Responsible for finding a transformer with the given criteria.
void	setMuleContext(MuleContext context)
void	transformerChange(Transformer transformer, TransformerResolver.RegistryAction registryAction) A callback that is called when a transformer is registered or unregistered from the registry.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

logger

protected final transient org.apache.commons.logging.Log logger

logger used by this class

exactTransformerCache

protected Map<String,Transformer> exactTransformerCache

graphTransformerResolver

protected TransformerResolver graphTransformerResolver

Constructor Detail

TypeBasedTransformerResolver

public TypeBasedTransformerResolver()

Method Detail

setMuleContext

public void setMuleContext(MuleContext context)

Specified by:

setMuleContext in interface MuleContextAware

initialise

public void initialise()
                throws InitialisationException

Description copied from interface: Initialisable

Method used to perform any initialisation work. If a fatal error occurs during initialisation an InitialisationException should be thrown, causing the Mule instance to shutdown. If the error is recoverable, say by retrying to connect, a RecoverableException should be thrown. There is no guarantee that by throwing a Recoverable exception that the Mule instance will not shut down.

Specified by:

initialise in interface Initialisable

Throws:

InitialisationException - if a fatal error occurs causing the Mule instance to shutdown

RecoverableException - if an error occurs that can be recovered from

resolve

public Transformer resolve(DataType source,
                  DataType result)
                    throws ResolverException

Description copied from interface: TransformerResolver

Responsible for finding a transformer with the given criteria. Note that if a transformer is not found null should be return, an exception must NOT be thrown.

Specified by:

resolve in interface TransformerResolver

Parameters:

source - information about the source object including the object iself

result - information about the result object to transform to

Returns:

a transformer from the registry that matches the criteria or null if a transformer was not found

Throws:

ResolverException - Only thrown if an exception is thrown during the search, this exception will just be a wrapper

getNearestTransformerMatch

protected Transformer getNearestTransformerMatch(List<Transformer> trans,
                                     Class input,
                                     Class output)
                                          throws ResolverException

Throws:

ResolverException

dispose

public void dispose()

Description copied from interface: Disposable

A lifecycle method where implementor should free up any resources. If an exception is thrown it should just be logged and processing should continue. This method should not throw Runtime exceptions.

Specified by:

dispose in interface Disposable

transformerChange

public void transformerChange(Transformer transformer,
                     TransformerResolver.RegistryAction registryAction)

Description copied from interface: TransformerResolver

A callback that is called when a transformer is registered or unregistered from the registry. This is used in situations where the resolver caches transformers and the cache needs to be updated.

Specified by:

transformerChange in interface TransformerResolver

Parameters:

transformer - the transformer that has changed

registryAction - whether the transformer was added or removed