io.katharsis.jpa.mapping

Interface JpaMapper<E,D>

All Known Implementing Classes:

IdentityMapper

public interface JpaMapper<E,D>

Maps a tuple to a DTO and a DTO back to a entity.

Method Summary

Modifier and Type	Method and Description
D	map(Tuple tuple) Usually the first tuple entry is the entity and any additonal tuple entries are computed attributes.
E	unmap(D dto) Maps the dto back to the entity.

Method Detail

map

D map(Tuple tuple)

Usually the first tuple entry is the entity and any additonal tuple entries are computed attributes. However, applications may choose to override this to only fetch a subset of attributes for performance reasons.

Parameters:

tuple - to map to a DTO. Usually the first entry is the entity. Additional entries are compuated attributes.

Returns:

mapped dto

unmap

E unmap(D dto)

Maps the dto back to the entity. Make sure to return a managed entity instance to support proper inserts, updates and deletes. An implementation may choose to lookup the entity with the entity manager and create a new instance if it has not been found.

Parameters:

dto - to map to an entity.

Returns:

entity