javax.persistence.PersistenceUtil Maven / Gradle / Ivy
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/*******************************************************************************
* 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(s).
*
* The PersistenceUtil interface instance obtained from the
* {@link Persistence} class is used to determine the load state of an
* entity or entity attribute regardless of which persistence
* provider in the environment created the entity.
*
* @since Java Persistence 2.0
*/
public interface PersistenceUtil {
/**
* Determine the load state of a given persistent attribute.
* @param entity entity 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.
* 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 whose load state is to be determined
* @return false if the entity has not been loaded, else true
*/
public boolean isLoaded(Object entity);
}