org.springframework.data.projection

Interface ProjectionFactory

All Known Implementing Classes:

SpelAwareProxyProjectionFactory

public interface ProjectionFactory

A factory to create projecting instances for other objects usually used to allow easy creation of representation projections to define which properties of a domain objects shall be exported in which way.

Since:

1.10

Author:

Oliver Gierke

Method Summary

Modifier and Type	Method and Description
default <T> T	createNullableProjection(Class<T> projectionType, Object source) Creates a projection to the given type for the given nullable source.
<T> T	createProjection(Class<T> projectionType) Creates a projection instance for the given type.
<T> T	createProjection(Class<T> projectionType, Object source) Creates a projection of the given type for the given source object.
ProjectionInformation	getProjectionInformation(Class<?> projectionType) Returns the ProjectionInformation for the given projection type.

Method Detail

createProjection

<T> T createProjection(Class<T> projectionType,
                       Object source)

Creates a projection of the given type for the given source object. The individual mapping strategy is defined by the implementations.

Parameters:

projectionType - the type to create, must not be null.

source - the object to create a projection for, must not be null.

Returns:

createNullableProjection

@Nullable
default <T> T createNullableProjection(Class<T> projectionType,
                                                 @Nullable
                                                 Object source)

Creates a projection to the given type for the given nullable source.

Parameters:

projectionType - must not be null.

source - can be null.

Returns:

createProjection

<T> T createProjection(Class<T> projectionType)

Creates a projection instance for the given type.

Parameters:

projectionType - the type to create, must not be null.

Returns:

getProjectionInformation

ProjectionInformation getProjectionInformation(Class<?> projectionType)

Returns the ProjectionInformation for the given projection type.

Parameters:

projectionType - must not be null.

Returns:

Since:

1.12