javax.persistence.PersistenceUnitUtil Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2008 - 2013 Oracle Corporation. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Linda DeMichiel - Java Persistence 2.1
* Linda DeMichiel - Java Persistence 2.0
*
******************************************************************************/
package javax.persistence;
/**
* Utility interface between the application and the persistence
* provider managing the persistence unit.
*
* The methods of this interface should only be invoked on entity
* instances obtained from or managed by entity managers for this
* persistence unit or on new entity instances.
*
* @since Java Persistence 2.0
*/
public interface PersistenceUnitUtil extends PersistenceUtil {
/**
* Determine the load state of a given persistent attribute
* of an entity belonging to the persistence unit.
* @param entity entity instance containing the attribute
* @param attributeName name of attribute whose load state is
* to be determined
* @return false if entity's state has not been loaded or if
* the attribute state has not been loaded, else true
*/
public boolean isLoaded(Object entity, String attributeName);
/**
* Determine the load state of an entity belonging to the
* persistence unit. This method can be used to determine the
* load state of an entity passed as a reference. An entity is
* considered loaded if all attributes for which
* FetchType.EAGER has been specified have been
* loaded.
*
The isLoaded(Object, String) method
* should be used to determine the load state of an attribute.
* Not doing so might lead to unintended loading of state.
* @param entity entity instance whose load state is to be determined
* @return false if the entity has not been loaded, else true
*/
public boolean isLoaded(Object entity);
/**
* Return the id of the entity.
* A generated id is not guaranteed to be available until after
* the database insert has occurred.
* Returns null if the entity does not yet have an id.
* @param entity entity instance
* @return id of the entity
* @throws IllegalArgumentException if the object is found not
* to be an entity
*/
public Object getIdentifier(Object entity);
}