Module jpastreamer.projection

Package com.speedment.jpastreamer.projection

Interface Projection<ENTITY>

All Superinterfaces:

Function<ENTITY,jakarta.persistence.Tuple>

public interface Projection<ENTITY>
extends Function<ENTITY,jakarta.persistence.Tuple>

The Projection class represents a SQL projection. Specific fields can be selected by using Projection#select. The result of Projection#select can be passed to JPAStreamer#stream to apply the specified projection.

Author:

Mislav Milicevic

Method Summary

Modifier and Type	Method	Description
Class<ENTITY>	entityClass()	Returns the entity class that the projection is applied to.
Set<Field<ENTITY>>	fields()	Returns the fields selected by this projections.
static <ENTITY> Projection<ENTITY>	select(Field<ENTITY> first, Field<ENTITY>... other)

Methods inherited from interface java.util.function.Function

andThen, apply, compose

Method Details

entityClass

Class<ENTITY> entityClass()

Returns the entity class that the projection is applied to.

Returns:

the entity class that the projection is applied to.

fields

Set<Field<ENTITY>> fields()

Returns the fields selected by this projections.

Returns:

the fields selected by this projection.

select

@SafeVarargs
static <ENTITY> Projection<ENTITY> select(Field<ENTITY> first,
 Field<ENTITY>... other)