javax.persistence.criteria.MapJoin Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of javax.persistence Show documentation
javax.persistence build based upon git transaction cfcdce1
There is a newer version: 2.2.1
/*******************************************************************************
 * Copyright (c) 2008 - 2013 Oracle Corporation. 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 2.1
 *     Linda DeMichiel - Java Persistence 2.0
 *
 ******************************************************************************/ 
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> {

    /**
     *  Modify the join to restrict the result according to the
     *  specified ON condition and return the join object.  
     *  Replaces the previous ON condition, if any.
     *  @param restriction  a simple or compound boolean expression
     *  @return the modified join object
     *  @since Java Persistence 2.1
     */
    MapJoin on(Expression restriction);

    /**
     *  Modify the join to restrict the result according to the
     *  specified ON condition and return the join object.  
     *  Replaces the previous ON condition, if any.
     *  @param restrictions  zero or more restriction predicates
     *  @return the modified join object
     *  @since Java Persistence 2.1
     */
    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();
}