src/javax/persistence/criteria/FetchParent.java

/*
 * Copyright (c) 2008, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Linda DeMichiel - 2.1
//     Linda DeMichiel - 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 <Z>  the source type
 * @param <X>  the target type
 *
 * @since 2.0
 */
public interface FetchParent<Z, X> {

    /**
     *  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<Fetch<X, ?>> 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
     */	
    <Y> Fetch<X, Y> fetch(SingularAttribute<? super X, Y> 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
     */	
    <Y> Fetch<X, Y> fetch(SingularAttribute<? super X, Y> 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
     */
    <Y> Fetch<X, Y> fetch(PluralAttribute<? super X, ?, Y> 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
     */
    <Y> Fetch<X, Y> fetch(PluralAttribute<? super X, ?, Y> 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")
    <X, Y> Fetch<X, Y> 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")
    <X, Y> Fetch<X, Y> fetch(String attributeName, JoinType jt);
}