org.mule.transformer
Class AbstractTransformer

java.lang.Object
  org.mule.transformer.AbstractTransformer

All Implemented Interfaces:

MuleContextAware, Initialisable, NamedObject, BaseTransformer, Transformer

Direct Known Subclasses:

AbstractCompressionTransformer, AbstractDiscoverableTransformer, AbstractEncryptionTransformer, AbstractEventTransformer, AbstractMessageAwareTransformer, AddBookResponse, Base64Decoder, Base64Encoder, BeanToMap, ByteArrayToHexString, ByteArrayToSerializable, ChatStringToString, CreditProfileXmlToCreditProfile, EmailMessageToString, ErrorMessageToException, ErrorMessageToExceptionBean, ExceptionBeanToErrorMessage, ExceptionToString, GetBeanProperty, HexStringToByteArray, HttpClientMethodResponseToObject, HttpRequestToNameString, HttpResponseToString, IPToSender, JXPathExtractor, LoanQuoteRequestToCreditProfileArgs, MapLookup, MapToBean, MimeMessageToRfc822ByteArray, NameStringToChatString, NoActionTransformer, ObjectArrayToString, ObjectToOutputHandler, ObjectToRemoteInvocationResultTransformer, ObjectToRemoteInvocationTransformer, ObjectToString, OrderToEmailTransformer, Rfc822ByteArraytoMimeMessage, SerializableToByteArray, ServletRequestToOutputHandler, SimpleMathTransformer, StdinToNameString, StringAppendTransformer, StringToNameString, StringToNumber, StringToObjectArray, ValidateResponse, XmlEntityDecoder, XmlEntityEncoder, XmlPrettyPrinter, XPathExtractor

public abstract class AbstractTransformer
extends Object
implements Transformer

AbstractTransformer is a base class for all transformers. Transformations transform one object into another.

Field Summary

protected static int	DEFAULT_TRUNCATE_LENGTH
protected ImmutableEndpoint	endpoint The endpoint that this transformer instance is configured on
protected Log	logger
static DataType	MULE_MESSAGE_ADAPTER_DATA_TYPE
static DataType	MULE_MESSAGE_DATA_TYPE
protected MuleContext	muleContext
protected String	name The name that identifies this transformer.
protected DataType	returnType The return type that will be returned by the transform(java.lang.Object) method is called
protected List<DataType<?>>	sourceTypes A list of supported Class types that the source payload passed into this transformer

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

PHASE_NAME

Constructor Summary

AbstractTransformer()
default constructor required for discovery

Method Summary

protected Object	checkReturnClass(Object object)
protected abstract Object	doTransform(Object src, String encoding)
protected String	generateTransformerName()
protected String	getEncoding(Object src)
ImmutableEndpoint	getEndpoint() The endpoint that this transformer is attached to
String	getName() Gets the name of the object
Class	getReturnClass() Specifies the Java type of the result after this transformer has been executed.
DataType	getReturnDataType() Specifies the return type of the result after this transformer has been executed.
List<DataType<?>>	getSourceDataTypes() Returns an unmodifiable list of Source types registered on this transformer
List<Class<?>>	getSourceTypes() Returns an unmodifiable list of Source types registered on this transformer
void	initialise() Template method where deriving classes can do any initialisation after the properties have been set on this transformer
boolean	isAcceptNull() Does this transformer allow null input?
protected boolean	isConsumed(Class srcCls)
boolean	isIgnoreBadInput() By default, Mule will throw an exception if a transformer is invoked with a source object that is not compatible with the transformer.
boolean	isSourceDataTypeSupported(DataType dataType) Determines if a particular source class can be handled by this transformer
boolean	isSourceDataTypeSupported(DataType dataType, boolean exactMatch) Determines whether that data type passed in is supported by this transformer
boolean	isSourceTypeSupported(Class aClass) Determines if a particular source class can be handled by this transformer
boolean	isSourceTypeSupported(Class aClass, boolean exactMatch) Deprecated. use isSourceDataTypeSupported(org.mule.api.transformer.DataType, boolean)
protected void	registerSourceType(Class<?> aClass) Register a supported data type with this transformer.
protected void	registerSourceType(DataType dataType) Register a supported data type with this transformer.
void	setEndpoint(ImmutableEndpoint endpoint) Sets the endpoint associated with with this connector.
void	setIgnoreBadInput(boolean ignoreBadInput)
void	setMuleContext(MuleContext context)
void	setName(String string) Sets the name of the object
void	setReturnClass(Class newClass) Sets the expected return type for the transformed data.
void	setReturnDataType(DataType type) Sets the expected return type for the transformed data.
String	toString()
Object	transform(Object src) Thransforms the supplied data and returns the result
Object	transform(Object src, String encoding) Thransforms the supplied data and returns the result
protected void	unregisterSourceType(Class<?> aClass) Unregister a supported source type from this transformer
protected void	unregisterSourceType(DataType dataType) Unregister a supported source type from this transformer

Methods inherited from class java.lang.Object

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

Field Detail

MULE_MESSAGE_DATA_TYPE

public static final DataType MULE_MESSAGE_DATA_TYPE

MULE_MESSAGE_ADAPTER_DATA_TYPE

public static final DataType MULE_MESSAGE_ADAPTER_DATA_TYPE

DEFAULT_TRUNCATE_LENGTH

protected static final int DEFAULT_TRUNCATE_LENGTH

See Also:

Constant Field Values

muleContext

protected MuleContext muleContext

logger

protected final Log logger

returnType

protected DataType returnType

The return type that will be returned by the transform(java.lang.Object) method is called

name

protected String name

The name that identifies this transformer. If none is set the class name of the transformer is used

endpoint

protected ImmutableEndpoint endpoint

The endpoint that this transformer instance is configured on

sourceTypes

protected final List<DataType<?>> sourceTypes

A list of supported Class types that the source payload passed into this transformer

Constructor Detail

AbstractTransformer

public AbstractTransformer()

default constructor required for discovery

Method Detail

checkReturnClass

protected Object checkReturnClass(Object object)
                           throws TransformerException

Throws:

TransformerException

registerSourceType

protected void registerSourceType(Class<?> aClass)

Register a supported data type with this transformer. The will allow objects that match this data type to be transformed by this transformer.

Parameters:

aClass - the source type to allow

unregisterSourceType

protected void unregisterSourceType(Class<?> aClass)

Unregister a supported source type from this transformer

Parameters:

aClass - the type to remove

registerSourceType

protected void registerSourceType(DataType dataType)

Register a supported data type with this transformer. The will allow objects that match this data type to be transformed by this transformer.

Parameters:

dataType - the source type to allow

unregisterSourceType

protected void unregisterSourceType(DataType dataType)

Unregister a supported source type from this transformer

Parameters:

dataType - the type to remove

getName

public String getName()

Description copied from interface: NamedObject

Gets the name of the object

Specified by:

getName in interface NamedObject

Returns:

transformer name

setName

public void setName(String string)

Description copied from interface: NamedObject

Sets the name of the object

Specified by:

setName in interface NamedObject

Parameters:

string -

getReturnClass

public Class getReturnClass()

Description copied from interface: Transformer

Specifies the Java type of the result after this transformer has been executed. Mule will use this to validate the return type but also allow users to perform automatic transformations based on the source type of the object to transform and this return type.

Specified by:

getReturnClass in interface Transformer

Returns:

the excepted return type from this transformer

setReturnDataType

public void setReturnDataType(DataType type)

Description copied from interface: Transformer

Sets the expected return type for the transformed data. If the transformed data is not of this class type a TransformerException will be thrown.

This method superseeds Transformer.getReturnClass() because it allows Generics information to be associated with the return type of the transformer

Specified by:

setReturnDataType in interface Transformer

Parameters:

type - the expected return type for this transformer

getReturnDataType

public DataType getReturnDataType()

Description copied from interface: Transformer

Specifies the return type of the result after this transformer has been executed. Mule will use this to validate the return type but also allow users to perform automatic transformations based on the source type of the object to transform and this return type.

This method superseeds Transformer.getReturnClass() because it allows Generics information to be associated with the return type of the transformer

Specified by:

getReturnDataType in interface Transformer

Returns:

the excepted return type for this transformer

setReturnClass

public void setReturnClass(Class newClass)

Description copied from interface: Transformer

Sets the expected return type for the transformed data. If the transformed data is not of this class type a TransformerException will be thrown.

Specified by:

setReturnClass in interface Transformer

Parameters:

newClass - the expected return type class

isSourceTypeSupported

public boolean isSourceTypeSupported(Class aClass)

Description copied from interface: Transformer

Determines if a particular source class can be handled by this transformer

Specified by:

isSourceTypeSupported in interface Transformer

Parameters:

aClass - The class to check for compatability

Returns:

true if the transformer supports this type of class or false otherwise

isSourceDataTypeSupported

public boolean isSourceDataTypeSupported(DataType dataType)

Description copied from interface: Transformer

Determines if a particular source class can be handled by this transformer

Specified by:

isSourceDataTypeSupported in interface Transformer

Parameters:

dataType - The DataType to check for compatability

Returns:

true if the transformer supports this type of class or false otherwise

isSourceTypeSupported

@Deprecated
public boolean isSourceTypeSupported(Class aClass,
                                                boolean exactMatch)

Deprecated. use isSourceDataTypeSupported(org.mule.api.transformer.DataType, boolean)

Determines whether that data type passed in is supported by this transformer

Parameters:

aClass - the type to check against

exactMatch - if the source type on this transformer is open (can be anything) it will return true unless an exact match is requested using this flag

Returns:

true if the source type is supported by this transformer, false otherwise

isSourceDataTypeSupported

public boolean isSourceDataTypeSupported(DataType dataType,
                                         boolean exactMatch)

Determines whether that data type passed in is supported by this transformer

Parameters:

dataType - the type to check against

exactMatch - if set to true, this method will look for an exact match to the data type, if false it will look for a compatible data type.

Returns:

true if the source type is supported by this transformer, false otherwise

transform

public final Object transform(Object src)
                       throws TransformerException

Description copied from interface: Transformer

Thransforms the supplied data and returns the result

Specified by:

transform in interface Transformer

Parameters:

src - the data to transform

Returns:

the transformed data

Throws:

TransformerException - if a error occurs transforming the data or if the expected returnClass isn't the same as the transformed data

transform

public Object transform(Object src,
                        String encoding)
                 throws TransformerException

Description copied from interface: Transformer

Thransforms the supplied data and returns the result

Specified by:

transform in interface Transformer

Parameters:

src - the data to transform

encoding - the encoding to use by this transformer. many transformations will not need encoding unless dealing with text so you only need to use this method if yo wish to customize the encoding

Returns:

the transformed data

Throws:

TransformerException - if a error occurs transforming the data or if the expected returnClass isn't the same as the transformed data

getEncoding

protected String getEncoding(Object src)

isConsumed

protected boolean isConsumed(Class srcCls)

getEndpoint

public ImmutableEndpoint getEndpoint()

Description copied from interface: BaseTransformer

The endpoint that this transformer is attached to

Specified by:

getEndpoint in interface BaseTransformer

Returns:

the endpoint associated with the transformer

setEndpoint

public void setEndpoint(ImmutableEndpoint endpoint)

Description copied from interface: BaseTransformer

Sets the endpoint associated with with this connector. This should be idempotent, since endpoints do not guarantee it will only be called once.

Specified by:

setEndpoint in interface BaseTransformer

Parameters:

endpoint - sets the endpoint associated with the transfromer

doTransform

protected abstract Object doTransform(Object src,
                                      String encoding)
                               throws TransformerException

Throws:

TransformerException

initialise

public void initialise()
                throws InitialisationException

Template method where deriving classes can do any initialisation after the properties have been set on this transformer

Specified by:

initialise in interface Initialisable

Throws:

InitialisationException

RecoverableException - if an error occurs that can be recovered from

generateTransformerName

protected String generateTransformerName()

getSourceTypes

public List<Class<?>> getSourceTypes()

Description copied from interface: Transformer

Returns an unmodifiable list of Source types registered on this transformer

Specified by:

getSourceTypes in interface Transformer

Returns:

an unmodifiable list of Source types registered on this transformer

getSourceDataTypes

public List<DataType<?>> getSourceDataTypes()

Description copied from interface: Transformer

Returns an unmodifiable list of Source types registered on this transformer

Specified by:

getSourceDataTypes in interface Transformer

Returns:

an unmodifiable list of Source types registered on this transformer

isIgnoreBadInput

public boolean isIgnoreBadInput()

Description copied from interface: Transformer

By default, Mule will throw an exception if a transformer is invoked with a source object that is not compatible with the transformer. Since transformers are often chained, it is useful to be able to ignore a transformer in the chain and move to the next one.

Specified by:

isIgnoreBadInput in interface Transformer

Returns:

true if the transformer can be ignorred if the currnet source type is not supported, false if an exception should be throw due to an incompatible source type being passed in.

setIgnoreBadInput

public void setIgnoreBadInput(boolean ignoreBadInput)

toString

public String toString()

Overrides:

toString in class Object

isAcceptNull

public boolean isAcceptNull()

Description copied from interface: Transformer

Does this transformer allow null input?

Specified by:

isAcceptNull in interface Transformer

Returns:

true if this transformer can accept null input

setMuleContext

public void setMuleContext(MuleContext context)

Specified by:

setMuleContext in interface MuleContextAware