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The Java Persistence API (JPA) : a standard interface-based Java model abstraction of persistence, developed by the JCP.

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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.Attribute;

/**
 * A join to an entity, embeddable, or basic type.
 * @param  the source type of the join
 * @param  the target type of the join
 */
public interface Join extends From
{
    /**
     * 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
     */
    Join 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
     */
    Join on(Predicate... restrictions);

    /**
     * Return the predicate that corresponds to the ON restriction(s) on the join, or null if no ON condition
     * has been specified.
     * @return the ON restriction predicate
     */
    Predicate getOn();

    /**
     * Return the metamodel attribute corresponding to the join.
     * @return metamodel attribute corresponding to the join
     */
    Attribute getAttribute();

    /**
     * Return the parent of the join.
     * @return join parent
     */
    From getParent();

    /**
     * Return the join type.
     * @return join type
     */
    JoinType getJoinType();
}