Package org.eclipse.persistence.annotations

Annotation Type ReadTransformer

  • @Target({METHOD,FIELD})
@Retention(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).
    See Also:
    Transformation, WriteTransformer, Transformation can be specified within an Entity, MappedSuperclass and Embeddable class.
    Author:
    Andrei Ilitchev

    • Optional Element Summary

      Optional Elements 
      Modifier and Type Optional Element 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

        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

        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:
        ""