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Clean-room definition of JPA APIs intended for use in developing Hibernate JPA implementation. See README.md for details

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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(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);
}