oracle.toplink.mappings.transformers
Interface FieldTransformer

All Superinterfaces:

java.io.Serializable

All Known Implementing Classes:

ConstantTransformer, FieldTransformerAdapter, MethodBasedFieldTransformer

public interface FieldTransformer
extends java.io.Serializable

This interface is used by the Transformation Mapping to build the value for a specific field. The user must provide implementations of this interface to the Transformation Mapping.

Since:

10.1.3

Method Summary

java.lang.Object	buildFieldValue(java.lang.Object instance, java.lang.String fieldName, Session session)
void	initialize(AbstractTransformationMapping mapping) Initialize this transformer.

Method Detail

initialize

void initialize(AbstractTransformationMapping mapping)

Initialize this transformer. Only required if the user needs some special information from the mapping in order to do the transformation

Parameters:

mapping - - the mapping this transformer is associated with.

buildFieldValue

java.lang.Object buildFieldValue(java.lang.Object instance,
                                 java.lang.String fieldName,
                                 Session session)

Parameters:

instance - - an instance of the domain class which contains the attribute

session - - the current session

fieldName - - the name of the field being transformed. Used if the user wants to use this transformer for multiple fields.

Returns:

- The value to be written for the field associated with this transformer