Package org.springframework.data.projection

Class EntityProjectionIntrospector

java.lang.Object

org.springframework.data.projection.EntityProjectionIntrospector

public class EntityProjectionIntrospector
extends Object

This class is introspects the returned type in the context of a domain type for all reachable properties (w/o cycles) to determine which property paths are subject to projection.

Since:

2.7

Author:

Gerrit Meier, Mark Paluch, Christoph Strobl, Oliver Drotbohm

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	EntityProjectionIntrospector.ProjectionPredicate	Represents a predicate (boolean-valued function) of a target type and its underlying type.

Method Summary

Modifier and Type	Method	Description
static EntityProjectionIntrospector	create(ProjectionFactory projectionFactory, EntityProjectionIntrospector.ProjectionPredicate projectionPredicate, MappingContext<?,?> mappingContext)	Create a new EntityProjectionIntrospector given ProjectionFactory, EntityProjectionIntrospector.ProjectionPredicate and MappingContext.
<M, D> EntityProjection<M,D>	introspect(Class<M> mappedType, Class<D> domainType)	Introspect a mapped type in the context of a domain type whether the returned type is a projection and what property paths are participating in the projection.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

create

public static EntityProjectionIntrospector create(ProjectionFactory projectionFactory,
 EntityProjectionIntrospector.ProjectionPredicate projectionPredicate,
 MappingContext<?,?> mappingContext)

Create a new EntityProjectionIntrospector given ProjectionFactory, EntityProjectionIntrospector.ProjectionPredicate and MappingContext.

Parameters:

projectionFactory - must not be null.

projectionPredicate - must not be null.

mappingContext - must not be null.

Returns:

a new EntityProjectionIntrospector instance.

introspect

public <M,
D> EntityProjection<M,D> introspect(Class<M> mappedType,
 Class<D> domainType)

Introspect a mapped type in the context of a domain type whether the returned type is a projection and what property paths are participating in the projection.

Nested properties (direct types, within maps, collections) are introspected for nested projections and contain property paths for closed projections.

Deeply nested types (e.g. Map<?, List<Person>>) are represented with a property path that uses the unwrapped type and no longer the root domain type D.

Parameters:

mappedType - must not be null.

domainType - must not be null.

Returns:

the introspection result.

See Also:

• EntityProjection.ContainerPropertyProjection