javax.persistence.spi
Interface PersistenceProvider

All Known Implementing Classes:

PersistenceProvider, PersistenceProvider

public interface PersistenceProvider

Interface implemented by the persistence provider. It is invoked by the container in Java EE environments and by the Persistence class in Java SE environments to create an EntityManagerFactory. It is also invoked by the PersistenceUtil implementation to determine the load status of an entity or entity attribute.

Method Summary

EntityManagerFactory	createContainerEntityManagerFactory(PersistenceUnitInfo info, java.util.Map map) Called by the container when an EntityManagerFactory is to be created.
EntityManagerFactory	createEntityManagerFactory(java.lang.String emName, java.util.Map map) Called by Persistence class when an EntityManagerFactory is to be created.
LoadState	isLoaded(java.lang.Object entity) If the provider determines that the entity has been provided by itself and that the state of all attributes for which FetchType EAGER has been specified have been loaded, this method returns LoadState.LOADED.
LoadState	isLoadedWithoutReference(java.lang.Object entity, java.lang.String attributeName) If the provider determines that the entity has been provided by itself and that the state of the specified attribute has been loaded, this method returns LoadState.LOADED.
LoadState	isLoadedWithReference(java.lang.Object entity, java.lang.String attributeName) If the provider determines that the entity has been provided by itself and that the state of the specified attribute has been loaded, this method returns LoadState.LOADED.

Method Detail

createEntityManagerFactory

EntityManagerFactory createEntityManagerFactory(java.lang.String emName,
                                                java.util.Map map)

Called by Persistence class when an EntityManagerFactory is to be created.

Parameters:

emName - The name of the persistence unit

map - A Map of properties for use by the persistence provider. These properties may be used to override the values of the corresponding elements in the persistence.xml file or specify values for properties not specified in the persistence.xml (and may be null if no properties are specified).

Returns:

EntityManagerFactory for the persistence unit, or null if the provider is not the right provider

createContainerEntityManagerFactory

EntityManagerFactory createContainerEntityManagerFactory(PersistenceUnitInfo info,
                                                         java.util.Map map)

Called by the container when an EntityManagerFactory is to be created.

Parameters:

info - Metadata for use by the persistence provider

map - A Map of integration-level properties for use by the persistence provider (may be null if no properties are specified). If a Bean Validation provider is present in the classpath, the container must pass the ValidatorFactory instance in the map with the key "javax.persistence.validation.factory".

Returns:

EntityManagerFactory for the persistence unit specified by the metadata

isLoadedWithoutReference

LoadState isLoadedWithoutReference(java.lang.Object entity,
                                   java.lang.String attributeName)

If the provider determines that the entity has been provided by itself and that the state of the specified attribute has been loaded, this method returns LoadState.LOADED. If the provider determines that the entity has been provided by itself and that either entity attributes with FetchType EAGER have not been loaded or that the state of the specified attribute has not been loaded, this methods returns LoadState.NOT_LOADED. If a provider cannot determine the load state, this method returns LoadState.UNKNOWN. The provider's implementation of this method must not obtain a reference to an attribute value, as this could trigger the loading of entity state if the entity has been provided by a different provider.

Parameters:

entity -

attributeName - name of attribute whose load status is to be determined

Returns:

load status of the attribute

isLoadedWithReference

LoadState isLoadedWithReference(java.lang.Object entity,
                                java.lang.String attributeName)

If the provider determines that the entity has been provided by itself and that the state of the specified attribute has been loaded, this method returns LoadState.LOADED. If a provider determines that the entity has been provided by itself and that either the entity attributes with FetchType EAGER have not been loaded or that the state of the specified attribute has not been loaded, this method returns return LoadState.NOT_LOADED. If the provider cannot determine the load state, this method returns LoadState.UNKNOWN. The provider's implementation of this method is permitted to obtain a reference to the attribute value. (This access is safe because providers which might trigger the loading of the attribute state will have already been determined by isLoadedWithoutReference. )

Parameters:

entity -

attributeName - name of attribute whose load status is to be determined

Returns:

load status of the attribute

isLoaded

LoadState isLoaded(java.lang.Object entity)

If the provider determines that the entity has been provided by itself and that the state of all attributes for which FetchType EAGER has been specified have been loaded, this method returns LoadState.LOADED. If the provider determines that the entity has been provided by itself and that not all attributes with FetchType EAGER have been loaded, this method returns LoadState.NOT_LOADED. If the provider cannot determine if the entity has been provided by itself, this method returns LoadState.UNKNOWN. The provider's implementation of this method must not obtain a reference to any attribute value, as this could trigger the loading of entity state if the entity has been provided by a different provider.

Parameters:

entity - whose loaded status is to be determined

Returns:

load status of the entity