javax.persistence

Interface EntityGraph<T>

Type Parameters:

T - The type of the root entity.

public interface EntityGraph<T>

This type represents the root of an entity graph that will be used as a template to define the attribute nodes and boundaries of a graph of entities and entity relationships. The root must be an entity type.

The methods to add subgraphs implicitly create the corresponding attribute nodes as well; such attribute nodes should not be redundantly specified.

Since:

Java Persistence 2.1

See Also:

AttributeNode, Subgraph, NamedEntityGraph

Method Summary

Methods

Modifier and Type	Method and Description
void	addAttributeNodes(Attribute<T,?>... attribute) Add one or more attribute nodes to the entity graph.
void	addAttributeNodes(String... attributeName) Add one or more attribute nodes to the entity graph.
<X> Subgraph<X>	addKeySubgraph(Attribute<T,X> attribute) Add a node to the graph that corresponds to a map key that is a managed type.
<X> Subgraph<? extends X>	addKeySubgraph(Attribute<T,X> attribute, Class<? extends X> type) Add a node to the graph that corresponds to a map key that is a managed type with inheritance.
<X> Subgraph<X>	addKeySubgraph(String attributeName) Add a node to the graph that corresponds to a map key that is a managed type.
<X> Subgraph<X>	addKeySubgraph(String attributeName, Class<X> type) Add a node to the graph that corresponds to a map key that is a managed type with inheritance.
<T> Subgraph<? extends T>	addSubclassSubgraph(Class<? extends T> type) Add additional attributes to this entity graph that correspond to attributes of subclasses of this EntityGraph's entity type.
<X> Subgraph<X>	addSubgraph(Attribute<T,X> attribute) Add a node to the graph that corresponds to a managed type.
<X> Subgraph<? extends X>	addSubgraph(Attribute<T,X> attribute, Class<? extends X> type) Add a node to the graph that corresponds to a managed type with inheritance.
<X> Subgraph<X>	addSubgraph(String attributeName) Add a node to the graph that corresponds to a managed type.
<X> Subgraph<X>	addSubgraph(String attributeName, Class<X> type) Add a node to the graph that corresponds to a managed type with inheritance.
List<AttributeNode<?>>	getAttributeNodes() Return the attribute nodes of this entity that are included in the entity graph.
String	getName() Return the name of a named EntityGraph (an entity graph defined by means of the NamedEntityGraph annotation, XML descriptor element, or added by means of the addNamedEntityGraph method.

Method Detail

getName

String getName()

Return the name of a named EntityGraph (an entity graph defined by means of the NamedEntityGraph annotation, XML descriptor element, or added by means of the addNamedEntityGraph method. Returns null if the EntityGraph is not a named EntityGraph.

addAttributeNodes

void addAttributeNodes(String... attributeName)

Add one or more attribute nodes to the entity graph.

Parameters:

attributeName - name of the attribute

Throws:

IllegalArgumentException - if the attribute is not an attribute of this entity.

IllegalStateException - if the EntityGraph has been statically defined

addAttributeNodes

void addAttributeNodes(Attribute<T,?>... attribute)

Add one or more attribute nodes to the entity graph.

Parameters:

attribute - attribute

Throws:

IllegalStateException - if the EntityGraph has been statically defined

addSubgraph

<X> Subgraph<X> addSubgraph(Attribute<T,X> attribute)

Add a node to the graph that corresponds to a managed type. This allows for construction of multi-node entity graphs that include related managed types.

Parameters:

attribute - attribute

Returns:

subgraph for the attribute

Throws:

IllegalArgumentException - if the attribute's target type is not a managed type

IllegalStateException - if the EntityGraph has been statically defined

addSubgraph

<X> Subgraph<? extends X> addSubgraph(Attribute<T,X> attribute,
                                    Class<? extends X> type)

Add a node to the graph that corresponds to a managed type with inheritance. This allows for multiple subclass subgraphs to be defined for this node of the entity graph. Subclass subgraphs will automatically include the specified attributes of superclass subgraphs.

Parameters:

attribute - attribute

type - entity subclass

Returns:

subgraph for the attribute

Throws:

IllegalArgumentException - if the attribute's target type is not a managed type

IllegalStateException - if the EntityGraph has been statically defined

addSubgraph

<X> Subgraph<X> addSubgraph(String attributeName)

Add a node to the graph that corresponds to a managed type. This allows for construction of multi-node entity graphs that include related managed types.

Parameters:

attributeName - name of the attribute

Returns:

subgraph for the attribute

Throws:

IllegalArgumentException - if the attribute is not an attribute of this entity.

IllegalArgumentException - if the attribute's target type is not a managed type

IllegalStateException - if the EntityGraph has been statically defined

addSubgraph

<X> Subgraph<X> addSubgraph(String attributeName,
                          Class<X> type)

Add a node to the graph that corresponds to a managed type with inheritance. This allows for multiple subclass subgraphs to be defined for this node of the entity graph. Subclass subgraphs will automatically include the specified attributes of superclass subgraphs.

Parameters:

attributeName - name of the attribute

type - entity subclass

Returns:

subgraph for the attribute

Throws:

IllegalArgumentException - if the attribute is not an attribute of this managed type.

IllegalArgumentException - if the attribute's target type is not a managed type

IllegalStateException - if this EntityGraph has been statically defined

addKeySubgraph

<X> Subgraph<X> addKeySubgraph(Attribute<T,X> attribute)

Add a node to the graph that corresponds to a map key that is a managed type. This allows for construction of multi-node entity graphs that include related managed types.

Parameters:

attribute - attribute

Returns:

subgraph for the key attribute

Throws:

IllegalArgumentException - if the attribute's target type is not an entity

IllegalStateException - if this EntityGraph has been statically defined

addKeySubgraph

<X> Subgraph<? extends X> addKeySubgraph(Attribute<T,X> attribute,
                                       Class<? extends X> type)

Add a node to the graph that corresponds to a map key that is a managed type with inheritance. This allows for construction of multi-node entity graphs that include related managed types. Subclass subgraphs will include the specified attributes of superclass subgraphs.

Parameters:

attribute - attribute

type - entity subclass

Returns:

subgraph for the key attribute

Throws:

IllegalArgumentException - if the attribute's target type is not an entity

IllegalStateException - if this EntityGraph has been statically defined

addKeySubgraph

<X> Subgraph<X> addKeySubgraph(String attributeName)

Add a node to the graph that corresponds to a map key that is a managed type. This allows for construction of multi-node entity graphs that include related managed types.

Parameters:

attributeName - name of the attribute

Returns:

subgraph for the key attribute

Throws:

IllegalArgumentException - if the attribute is not an attribute of this entity.

IllegalArgumentException - if the attribute's target type is not an entity

IllegalStateException - if this EntityGraph has been statically defined

addKeySubgraph

<X> Subgraph<X> addKeySubgraph(String attributeName,
                             Class<X> type)

Add a node to the graph that corresponds to a map key that is a managed type with inheritance. This allows for construction of multi-node entity graphs that include related managed types. Subclass subgraphs will automatically include the specified attributes of superclass subgraphs

Parameters:

attributeName - name of the attribute

type - entity subclass

Returns:

subgraph for the key attribute

Throws:

IllegalArgumentException - if the attribute is not an attribute of this entity.

IllegalArgumentException - if the attribute's target type is not a managed type

IllegalStateException - if this EntityGraph has been statically defined

addSubclassSubgraph

<T> Subgraph<? extends T> addSubclassSubgraph(Class<? extends T> type)

Add additional attributes to this entity graph that correspond to attributes of subclasses of this EntityGraph's entity type. Subclass subgraphs will automatically include the specified attributes of superclass subgraphs.

Parameters:

type - entity subclass

Returns:

subgraph for the subclass

Throws:

IllegalArgumentException - if the type is not an entity type

IllegalStateException - if the EntityGraph has been statically defined

getAttributeNodes

List<AttributeNode<?>> getAttributeNodes()

Return the attribute nodes of this entity that are included in the entity graph.

Returns:

attribute nodes for the annotated entity type or empty list if none have been defined