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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.criteria;

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

/**
 * 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> {
	/**
	 * Modify the join to restrict the result according to the
	 * specified ON condition. Replaces the previous ON condition,
	 * if any.
	 * Return the join object
	 * @param restriction a simple or compound boolean expression
	 * @return the modified join object
	 */
	MapJoin on(Expression restriction);

	/**
	 * Modify the join to restrict the result according to the
	 * specified ON condition. Replaces the previous ON condition,
	 * if any.
	 * Return the join object
	 * @param restrictions zero or more restriction predicates
	 * @return the modified join object
	 */
	MapJoin on(Predicate... restrictions);

	/**
	 * 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();
}