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/*
 * Copyright 2010 Bull S.A.S.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package javax.persistence;

/**
 * Utility interface between the application and the persistence provider(s).
 * 
 * The PersistenceUtil interface instance obtained from the 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.
 * @see JPA 2.0 specification
 * @author Florent Benoit
 * @since JPA 2.0 version.
 */
public interface PersistenceUtil {

    /**
     * Determine the load state of a given persistent attribute.
     * @param 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
     */
    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
     */
    boolean isLoaded(Object entity);
}