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/*******************************************************************************
 * 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 javax.persistence.metamodel.PluralAttribute;
import javax.persistence.metamodel.SingularAttribute;

/**
 * Represents an element of the from clause which may
 * function as the parent of Fetches.
 *
 * @param   the source type
 * @param   the target type
 *
 * @since Java Persistence 2.0
 */
public interface FetchParent {

    /**
     *  Return the fetch joins that have been made from this type.
     *  Returns empty set if no fetch joins have been made from
     *  this type.
     *  Modifications to the set do not affect the query.
     *  @return fetch joins made from this type
     */
    java.util.Set> getFetches();

    /**
     *  Create a fetch join to the specified single-valued attribute 
     *  using an inner join.
     *  @param attribute  target of the join
     *  @return the resulting fetch join
     */	
     Fetch fetch(SingularAttribute attribute);

    /**
     *  Create a fetch join to the specified single-valued attribute 
     *  using the given join type.
     *  @param attribute  target of the join
     *  @param jt  join type
     *  @return the resulting fetch join
     */	
     Fetch fetch(SingularAttribute attribute, JoinType jt);

    /**
     *  Create a fetch join to the specified collection-valued 
     *  attribute using an inner join. 
     *  @param attribute  target of the join
     *  @return the resulting join
     */
     Fetch fetch(PluralAttribute attribute);
	
    /**
     *  Create a fetch join to the specified collection-valued 
     *  attribute using the given join type.
     *  @param attribute  target of the join
     *  @param jt  join type
     *  @return the resulting join
     */
     Fetch fetch(PluralAttribute attribute, JoinType jt);
	

    //String-based:
	
    /**
     *  Create a fetch join to the specified attribute using an 
     *  inner join.
     *  @param attributeName  name of the attribute for the
     *         target of the join
     *  @return the resulting fetch join
     *  @throws IllegalArgumentException if attribute of the given
     *          name does not exist
     */	
    @SuppressWarnings("hiding")
     Fetch fetch(String attributeName);

    /**
     *  Create a fetch join to the specified attribute using 
     *  the given join type.
     *  @param attributeName  name of the attribute for the
     *               target of the join
     *  @param jt  join type
     *  @return the resulting fetch join
     *  @throws IllegalArgumentException if attribute of the given
     *          name does not exist
     */	
    @SuppressWarnings("hiding")
     Fetch fetch(String attributeName, JoinType jt);
}