org.mule.module.json.transformers

Class JsonTransformerResolver

java.lang.Object

org.mule.module.json.transformers.JsonTransformerResolver

All Implemented Interfaces:

MuleContextAware, Disposable, TransformerResolver

public class JsonTransformerResolver
extends Object
implements TransformerResolver, MuleContextAware, Disposable

A TransformerResolver implementation used to discover whether the current transform requests requires Json mashaling. The resolver will scan the source and return type for Jackson (http://jackson.codehaus.org) Json annotations and will configure a JSON transformer accordingly. The transformer is cached and will be used for any subsequent requests. The ObjectMapper instance needed for the transform can be discovered from the registry, this means one can be pre-configured in Spring or Guice. If there is no pre-configured ObjectMapper one will be created with the annotated JSON class. This context will cached with the transformer.

Since:

3.0

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
static String	JSON_MIME_TYPE
protected Log	logger logger used by this class

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

PHASE_NAME

Constructor Summary

Constructors

Constructor and Description
JsonTransformerResolver()

Method Summary

Methods

Modifier and Type	Method and Description
void	dispose() A lifecycle method where implementor should free up any resources.
protected JsonMapperResolver	getMapperResolver()
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

JSON_MIME_TYPE

public static final String JSON_MIME_TYPE

See Also:

Constant Field Values

logger

protected final transient Log logger

logger used by this class

Constructor Detail

JsonTransformerResolver

public JsonTransformerResolver()

Method Detail

setMuleContext

public void setMuleContext(MuleContext context)

Specified by:

setMuleContext in interface MuleContextAware

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

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

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

getMapperResolver

protected JsonMapperResolver getMapperResolver()
                                        throws ResolverException

Throws:

ResolverException