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/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the "License").  You may not use this file except 
 * in compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt or 
 * https://glassfish.dev.java.net/public/CDDLv1.0.html. 
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * HEADER in each file and include the License file at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable, 
 * add the following below this CDDL HEADER, with the 
 * fields enclosed by brackets "[]" replaced with your 
 * own identifying information: Portions Copyright [yyyy] 
 * [name of copyright owner]
 */
// Copyright (c) 1998, 2005, Oracle. All rights reserved.  
package oracle.toplink.essentials.queryframework;

import java.io.Serializable;
import oracle.toplink.essentials.internal.databaseaccess.Accessor;
import oracle.toplink.essentials.internal.queryframework.*;

/**
 * Call defines the interface used primarily by TopLink queries
 * and query mechanisms to perform the necessary actions
 * (read, insert, update, delete) on the data store.
 * A Call can collaborate with an Accessor to perform its
 * responsibilities. The only explicit requirement of a Call is that
 * it be able to supply the appropriate query mechanism for
 * performing its duties. Otherwise, the Call is pretty much
 * unrestricted as to how it should perform its responsibilities.
 *
 * @see DatabaseQuery
 *
 * @author Big Country
 * @since TOPLink/Java 3.0
 */
public interface Call extends Cloneable, Serializable {

    /**
     * INTERNAL:
     * Return the appropriate mechanism,
     * with the call set as necessary.
     */
    DatabaseQueryMechanism buildNewQueryMechanism(DatabaseQuery query);

    /**
     * INTERNAL:
     * Return the appropriate mechanism,
     * with the call added as necessary.
     */
    DatabaseQueryMechanism buildQueryMechanism(DatabaseQuery query, DatabaseQueryMechanism mechanism);

    /**
     * INTERNAL:
     * Return a clone of the call.
     */
    Object clone();

    /**
     * INTERNAL:
     * Return a string appropriate for the session log.
     */
    String getLogString(Accessor accessor);

    /**
     * INTERNAL:
     * Return whether the call is finished returning
     * all of its results (e.g. a call that returns a cursor
     * will answer false).
     */
    boolean isFinished();
}