org.mule.api.transformer
Interface Transformer

All Superinterfaces:

BaseTransformer, Initialisable, MuleContextAware, NamedObject

All Known Implementing Classes:

AbstractCompressionTransformer, AbstractDiscoverableTransformer, AbstractEncryptionTransformer, AbstractEventTransformer, AbstractExpressionTransformer, AbstractJmsTransformer, AbstractJsonTransformer, AbstractMessageAwareTransformer, AbstractTransformer, AbstractXmlTransformer, AbstractXStreamTransformer, AddBookResponse, AutoTransformer, Base64Decoder, Base64Encoder, BeanBuilderTransformer, BeanToMap, ByteArrayToHexString, ByteArrayToMuleMessage, ByteArrayToObject, ByteArrayToSerializable, ChatStringToString, CreditProfileXmlToCreditProfile, DecryptionTransformer, DomDocumentToXml, EmailMessageToString, EncryptionTransformer, ErrorMessageToException, ErrorMessageToExceptionBean, EventObjectTransformer, ExceptionBeanToErrorMessage, ExceptionToString, ExpressionTransformer, FileToByteArray, FileToString, GetBeanProperty, GZipCompressTransformer, GZipUncompressTransformer, HexStringToByteArray, HttpClientMethodResponseToObject, HttpRequestBodyToParamMap, HttpRequestToBook, HttpRequestToByteArray, HttpRequestToInputStream, HttpRequestToNameString, HttpRequestToParameter, HttpRequestToParameterMap, HttpRequestToSoapRequest, HttpResponseToString, IPToSender, JMSMessageToObject, JsonToObject, JXPathExtractor, LoanQuoteRequestToCreditProfileArgs, MapLookup, MapToBean, MessagePropertiesTransformer, MimeMessageToRfc822ByteArray, MuleMessageToByteArray, MuleMessageToHttpResponse, NameStringToChatString, NoActionTransformer, ObjectArrayToString, ObjectToByteArray, ObjectToHttpClientMethodRequest, ObjectToInputStream, ObjectToJMSMessage, ObjectToJson, ObjectToMimeMessage, ObjectToOutputHandler, ObjectToRemoteInvocationResultTransformer, ObjectToRemoteInvocationTransformer, ObjectToString, ObjectToXml, ObjectToXmppPacket, OrderToEmailTransformer, RestRequestToCustomerRequest, Rfc822ByteArraytoMimeMessage, ScriptTransformer, SerializableToByteArray, ServletRequestToOutputHandler, SetLendersAsRecipients, SimpleMathTransformer, StdinToNameString, StringAppendTestTransformer, StringAppendTransformer, StringToEmailMessage, StringToNameString, StringToNumber, StringToObjectArray, TransformerChain, TransformerTemplate, ValidateResponse, XmlEntityDecoder, XmlEntityEncoder, XmlPrettyPrinter, XmlToDomDocument, XmlToObject, XmlToOutputHandler, XmlToXMLStreamReader, XmppPacketToObject, XPathExtractor, XQueryTransformer, XsltTransformer

public interface Transformer
extends BaseTransformer, MuleContextAware

Transformer can be chained together to covert message payloads from one object type to another.

Field Summary

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

PHASE_NAME

Method Summary

Class	getReturnClass() Specifies the Java type of the result after this transformer has been executed.
List<Class>	getSourceTypes() Returns an unmodifiable list of Source types registered on this transformer
boolean	isAcceptNull() Does this transformer allow null input?
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	isSourceTypeSupported(Class aClass) Determines if a particular source class can be handled by this transformer
void	setReturnClass(Class theClass) Sets the expected return type for the transformed data.
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

Methods inherited from interface org.mule.api.transformer.BaseTransformer

getEndpoint, setEndpoint

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

initialise

Methods inherited from interface org.mule.api.NamedObject

getName, setName

Methods inherited from interface org.mule.api.context.MuleContextAware

setMuleContext

Method Detail

isSourceTypeSupported

boolean isSourceTypeSupported(Class aClass)

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

Parameters:

aClass - The class to check for compatability

Returns:

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

getSourceTypes

List<Class> getSourceTypes()

Returns an unmodifiable list of Source types registered on this transformer

Returns:

an unmodifiable list of Source types registered on this transformer

isAcceptNull

boolean isAcceptNull()

Does this transformer allow null input?

Returns:

true if this transformer can accept null input

isIgnoreBadInput

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. Since transformers are often chained, it is useful to be able to ignore a transformer in the chain and move to the next one.

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.

transform

Object transform(Object src)
                 throws TransformerException

Thransforms the supplied data and returns the result

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

Object transform(Object src,
                 String encoding)
                 throws TransformerException

Thransforms the supplied data and returns the result

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

setReturnClass

void setReturnClass(Class theClass)

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

Parameters:

theClass - the expected return type class

getReturnClass

Class getReturnClass()

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.

Returns:

the excepted return type from this transformer