Package org.springframework.data.projection

Class EntityProjection<M,D>

java.lang.Object

org.springframework.data.projection.EntityProjection<M,D>

Type Parameters:

M - the mapped type acting as view onto the domain type.

D - the domain type.

All Implemented Interfaces:

Iterable<EntityProjection.PropertyProjection<?,?>>, Supplier<Stream<EntityProjection.PropertyProjection<?,?>>>, Streamable<EntityProjection.PropertyProjection<?,?>>

Direct Known Subclasses:

EntityProjection.PropertyProjection

public class EntityProjection<M,D>
extends Object
implements Streamable<EntityProjection.PropertyProjection<?,?>>

Descriptor for a top-level mapped type representing a view onto a domain type structure. The view may exactly match the domain type or be a DTO/interface projection.

Since:

2.7

Author:

Mark Paluch, Christoph Strobl

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	EntityProjection.ContainerPropertyProjection<M,D>	Descriptor for a property-level type along its potential projection that is held within a Collection-like or Map-like container.
static enum	EntityProjection.ProjectionType	Projection type.
static class	EntityProjection.PropertyProjection<M,D>	Descriptor for a property-level type along its potential projection.

Method Summary

Modifier and Type	Method	Description
EntityProjection<?,?>	findProperty(String name)	Return a EntityProjection for a property identified by name.
void	forEachRecursive(Consumer<? super EntityProjection.PropertyProjection<?,?>> action)	Performs the given action for each element of the Streamable recursively until all elements of the graph have been processed or the action throws an Exception.
TypeInformation<?>	getActualDomainType()
TypeInformation<?>	getActualMappedType()
TypeInformation<D>	getDomainType()
TypeInformation<M>	getMappedType()
boolean	isClosedProjection()
boolean	isProjection()
Iterator<EntityProjection.PropertyProjection<?,?>>	iterator()
static <T> EntityProjection<T,T>	nonProjecting(Class<T> type)	Create a non-projecting variant of a type.
static <M, D> EntityProjection<M,D>	nonProjecting(TypeInformation<M> mappedType, TypeInformation<D> domainType, List<EntityProjection.PropertyProjection<?,?>> properties)	Create a non-projecting variant of a mapped type.
static <M, D> EntityProjection<M,D>	projecting(TypeInformation<M> mappedType, TypeInformation<D> domainType, List<EntityProjection.PropertyProjection<?,?>> properties, EntityProjection.ProjectionType projectionType)	Create a projecting variant of a mapped type.
String	toString()

Methods inherited from class java.lang.Object

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

Method Details

projecting

public static <M,
D> EntityProjection<M,D> projecting(TypeInformation<M> mappedType,
 TypeInformation<D> domainType,
 List<EntityProjection.PropertyProjection<?,?>> properties,
 EntityProjection.ProjectionType projectionType)

Create a projecting variant of a mapped type.

Parameters:

mappedType - the target projection type. Must not be null.

domainType - the source domain type. Must not be null.

properties - properties to include.

projectionType - must not be null.

Returns:

new instance of EntityProjection.

nonProjecting

public static <M,
D> EntityProjection<M,D> nonProjecting(TypeInformation<M> mappedType,
 TypeInformation<D> domainType,
 List<EntityProjection.PropertyProjection<?,?>> properties)

Create a non-projecting variant of a mapped type.

Parameters:

mappedType - the target projection type. Must not be null.

domainType - the source domain type. Must not be null.

properties - properties to include.

Returns:

new instance of EntityProjection.

nonProjecting

public static <T> EntityProjection<T,T> nonProjecting(Class<T> type)

Create a non-projecting variant of a type.

Parameters:

type - must not be null.

Returns:

new instance of EntityProjection.

forEachRecursive

public void forEachRecursive(Consumer<? super EntityProjection.PropertyProjection<?,?>> action)

Performs the given action for each element of the Streamable recursively until all elements of the graph have been processed or the action throws an Exception. Unless otherwise specified by the implementing class, actions are performed in the order of iteration (if an iteration order is specified). Exceptions thrown by the action are relayed to the caller.

Parameters:

action - must not be null.

iterator

public Iterator<EntityProjection.PropertyProjection<?,?>> iterator()

Specified by:

iterator in interface Iterable<M>

getMappedType

public TypeInformation<M> getMappedType()

Returns:

the mapped type used by this type view.

getActualMappedType

public TypeInformation<?> getActualMappedType()

Returns:

the actual mapped type used by this type view. Should be used for collection-like and map-like properties to determine the actual view type.

Throws:

IllegalStateException - if the actual type cannot be resolved.

getDomainType

public TypeInformation<D> getDomainType()

Returns:

the domain type represented by this type view.

getActualDomainType

public TypeInformation<?> getActualDomainType()

Returns:

the actual domain type represented by this type view. Should be used for collection-like and map-like properties to determine the actual domain type.

Throws:

IllegalStateException - if the actual type cannot be resolved.

isProjection

public boolean isProjection()

Returns:

true if the getMappedType() is a projection.

isClosedProjection

public boolean isClosedProjection()

Returns:

true if the getMappedType() is a closed projection.

findProperty

@Nullable
public EntityProjection<?,?> findProperty(String name)

Return a EntityProjection for a property identified by name.

Parameters:

name - the property name.

Returns:

the type view, if the property is known; null otherwise.

toString

public String toString()

Overrides:

toString in class Object