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/*******************************************************************************
 * Copyright (c) 2008, 2009 Sun Microsystems. 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 2.0 - Version 2.0 (October 1, 2009)
 *     Specification available from http://jcp.org/en/jsr/detail?id=317
 *
 ******************************************************************************/
package javax.persistence.criteria;

import java.util.Map;
import javax.persistence.metamodel.MapAttribute;

/**
 * The MapJoin interface is the type of the result of
 * joining to a collection over an association or element 
 * collection that has been specified as a java.util.Map.
 *
 * @param  the source type of the join
 * @param  the type of the target Map key
 * @param  the type of the target Map value
 *
 * @since Java Persistence 2.0
 */
public interface MapJoin 
		extends PluralJoin, V> {

    /**
     * Return the metamodel representation for the map attribute.
     * @return metamodel type representing the Map that is
     *         the target of the join
     */
    MapAttribute getModel();
    
    /**
     * Create a path expression that corresponds to the map key.
     * @return path corresponding to map key
     */
    Path key();
    
    /**
     * Create a path expression that corresponds to the map value.
     * This method is for stylistic use only: it just returns this.
     * @return path corresponding to the map value
     */
    Path value(); 
    
    /**
     * Create an expression that corresponds to the map entry.
     * @return expression corresponding to the map entry
     */
    Expression> entry();
}