javax.persistence.PersistenceUnitUtil Maven / Gradle / Ivy
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/*
* Copyright (c) 2008, 2009, 2011 Oracle, Inc. 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.
*/
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);
}