/*******************************************************************************
 * Copyright (c) 1998, 2008 Oracle. 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:
 *     Oracle - initial API and implementation from Oracle TopLink
 ******************************************************************************/  
package org.eclipse.persistence.queries;

import org.eclipse.persistence.sessions.Session;

/**
 * <p><b>Purpose</b>: The fetch group tracker interface provides a set of APIs which
 * the domain object must implement, in order to take advantage of the EclipseLink fetch group
 * performance enhancement feature.
 *
 * @see org.eclipse.persistence.queries.FetchGroup
 *
 * @author King Wang
 * @since TopLink 10.1.3
 */
public interface FetchGroupTracker {

    /**
     * Return the fetch group being tracked
     */
    FetchGroup _persistence_getFetchGroup();

    /**
     * Set a fetch group to be tracked.
     */
    void _persistence_setFetchGroup(FetchGroup group);

    /**
     * Return true if the attribute is in the fetch group being tracked.
     */
    boolean _persistence_isAttributeFetched(String attribute);

    /**
     * Reset all attributes of the tracked object to the unfetched state with initial default values.
     */
    void _persistence_resetFetchGroup();

    /**
     * Return true if the fetch group attributes should be refreshed.
     */
    boolean _persistence_shouldRefreshFetchGroup();

    /**
     * Set true if the fetch group attributes should be refreshed.
     */
    void _persistence_setShouldRefreshFetchGroup(boolean shouldRefreshFetchGroup);
    
    /**
     * Return the session for the object.
     */
    Session _persistence_getSession();

    /**
     * Set true if the fetch group attributes should be refreshed
     */
    void _persistence_setSession(Session session);
}