javax.persistence.spi
Interface ProviderUtil

All Known Implementing Classes:

PersistenceProvider

public interface ProviderUtil

Utility interface implemented by the persistence provider. This interface is invoked by the PersistenceUtil implementation to determine the load status of an entity or entity attribute.

Since:

Java Persistence 2.0

Method Summary

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

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 - entity instance

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 - entity instance

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