org.eclipse.persistence.annotations

Annotation Type ReadTransformer

@Target(value={METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface ReadTransformer

Annotation for org.eclipse.persistence.mappings.TransformationMapping. Unless the TransformationMapping is write-only, it should have a ReadTransformer, it defines transformation of database column(s) value(s) into attribute value. Also unless it's a read-only mapping, either WriteTransformer annotation or WriteTransformers annotation should be specified. Each WriteTransformer defines transformation of the attribute value to a single database column value (column is specified in the WriteTransformer).

Author:

Andrei Ilitchev

See Also:

Transformation, WriteTransformer, Transformation can be specified within an Entity, MappedSuperclass and Embeddable class.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
java.lang.String	method The mapped class must have a method with this name which returns a value to be assigned to the attribute (not assigns the value to the attribute).
java.lang.Class	transformerClass User-defined class that must implement the org.eclipse.persistence.mappings.transformers.AttributeTransformer interface.

Element Detail

transformerClass

public abstract java.lang.Class transformerClass

User-defined class that must implement the org.eclipse.persistence.mappings.transformers.AttributeTransformer interface. The class will be instantiated, its buildAttributeValue will be used to create the value to be assigned to the attribute. Either transformerClass or method must be specified, but not both.

Default:

void.class

method

public abstract java.lang.String method

The mapped class must have a method with this name which returns a value to be assigned to the attribute (not assigns the value to the attribute). Either transformerClass or method must be specified, but not both.

Default:

""