Contract for a generic dto to entity mapper from JHipster.

EntityMapper.java

import java.util.List;
import org.mapstruct.BeanMapping;
import org.mapstruct.MappingTarget;
import org.mapstruct.Named;
import org.mapstruct.NullValuePropertyMappingStrategy;

/**
 * Contract for a generic dto to entity mapper.
 *
 * @param <D> - DTO type parameter.
 * @param <E> - Entity type parameter.
 */

public interface EntityMapper<D, E> {
    E toEntity(D dto);

    D toDto(E entity);

    List<E> toEntity(List<D> dtoList);

    List<D> toDto(List<E> entityList);

    @Named("partialUpdate")
    @BeanMapping(nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE)
    void partialUpdate(@MappingTarget E entity, D dto);
}

ExampleEntityMapper.java

import org.mapstruct.*;

/**
 * Mapper for the entity {@link ExampleEntity} and its DTO {@link ExampleEntityDTO}.
 */
@Mapper(componentModel = "spring")
public interface ExampleEntityMapper extends EntityMapper<ExampleEntityDTO, ExampleEntity> {}