Package org.springframework.data.mapping.context

Class PersistentEntities

java.lang.Object

org.springframework.data.mapping.context.PersistentEntities

All Implemented Interfaces:

Iterable<PersistentEntity<?,? extends PersistentProperty<?>>>, Supplier<Stream<PersistentEntity<?,? extends PersistentProperty<?>>>>, Streamable<PersistentEntity<?,? extends PersistentProperty<?>>>

public class PersistentEntities
extends Object
implements Streamable<PersistentEntity<?,? extends PersistentProperty<?>>>

Value object to access PersistentEntity instances managed by MappingContexts.

Since:

1.8

Author:

Oliver Gierke, Christoph Strobl, Mark Paluch

Constructor Summary

Constructors

Constructor	Description
PersistentEntities(Iterable<? extends MappingContext<?,?>> contexts)	Creates a new PersistentEntities for the given MappingContexts.

Method Summary

Modifier and Type	Method	Description
PersistentEntity<?,?>	getEntityUltimatelyReferredToBy(PersistentProperty<?> property)	Returns the PersistentEntity the given PersistentProperty refers to in case it's an association.
Streamable<TypeInformation<?>>	getManagedTypes()	Returns all TypeInformation exposed by the registered MappingContexts.
Optional<PersistentEntity<?,? extends PersistentProperty<?>>>	getPersistentEntity(Class<?> type)	Returns the PersistentEntity for the given type.
PersistentEntity<?,? extends PersistentProperty<?>>	getRequiredPersistentEntity(Class<?> type)	Returns the PersistentEntity for the given type.
TypeInformation<?>	getTypeUltimatelyReferredToBy(PersistentProperty<?> property)	Returns the type the given PersistentProperty ultimately refers to.
Iterator<PersistentEntity<?,? extends PersistentProperty<?>>>	iterator()
<T> Optional<T>	mapOnContext(Class<?> type, BiFunction<MappingContext<?,? extends PersistentProperty<?>>,PersistentEntity<?,?>,T> combiner)	Executes the given BiFunction on the given MappingContext and PersistentEntity based on the given type.
static PersistentEntities	of(MappingContext<?,?>... contexts)	Creates a new PersistentEntities for the given MappingContexts.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface org.springframework.data.util.Streamable

and, and, and, and, filter, flatMap, get, isEmpty, map, stream, toList, toSet

Constructor Details

PersistentEntities

public PersistentEntities(Iterable<? extends MappingContext<?,?>> contexts)

Creates a new PersistentEntities for the given MappingContexts.

Parameters:

contexts -

Method Details

of

public static PersistentEntities of(MappingContext<?,?>... contexts)

Creates a new PersistentEntities for the given MappingContexts.

Parameters:

contexts - must not be null.

Returns:

getPersistentEntity

public Optional<PersistentEntity<?,? extends PersistentProperty<?>>> getPersistentEntity(Class<?> type)

Returns the PersistentEntity for the given type. Will consider all MappingContexts registered but return Optional#empty() in case none of the registered ones already have a PersistentEntity registered for the given type.

Parameters:

type - can be null.

Returns:

See Also:

• MappingContext.hasPersistentEntityFor(Class)
• MappingContext.getPersistentEntity(Class)

getRequiredPersistentEntity

public PersistentEntity<?,? extends PersistentProperty<?>> getRequiredPersistentEntity(Class<?> type)

Returns the PersistentEntity for the given type. Will consider all MappingContexts registered and create a new PersistentEntity in case none of the registered ones already have it registered for the given type, if there is only one context available.

Parameters:

type - must not be null.

Returns:

the PersistentEntity for the given domain type.

Throws:

MappingException - if the PersistentEntity cannot be found or created by the underlying MappingContext.

See Also:

• MappingContext.getRequiredPersistentEntity(Class)

mapOnContext

public <T> Optional<T> mapOnContext(Class<?> type,
 BiFunction<MappingContext<?,? extends PersistentProperty<?>>,PersistentEntity<?,?>,T> combiner)

Executes the given BiFunction on the given MappingContext and PersistentEntity based on the given type. Considers all MappingContexts for lookup. This method will create a new PersistentEntity in case there is only a single MappingContext registered.

Parameters:

type - must not be null.

combiner - must not be null.

Returns:

result of the BiFunction.

getManagedTypes

public Streamable<TypeInformation<?>> getManagedTypes()

Returns all TypeInformation exposed by the registered MappingContexts.

Returns:

iterator

public Iterator<PersistentEntity<?,? extends PersistentProperty<?>>> iterator()

Specified by:

iterator in interface Iterable<PersistentEntity<?,? extends PersistentProperty<?>>>

getEntityUltimatelyReferredToBy

@Nullable
public PersistentEntity<?,?> getEntityUltimatelyReferredToBy(PersistentProperty<?> property)

Returns the PersistentEntity the given PersistentProperty refers to in case it's an association. For direct aggregate references, that's simply the entity for the PersistentProperty's actual type. If the property type is not an entity - as it might rather refer to the identifier type - we either use the reference's defined target type and fall back to trying to find a PersistentEntity identified by the PersistentProperty's actual type.

Parameters:

property - must not be null.

Returns:

Since:

2.1

getTypeUltimatelyReferredToBy

public TypeInformation<?> getTypeUltimatelyReferredToBy(PersistentProperty<?> property)

Returns the type the given PersistentProperty ultimately refers to. In case it's of a unique identifier type of an entity known it'll return the entity type.

Parameters:

property - must not be null.

Returns: