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There is a newer version: 2.2.1

/*******************************************************************************
 * Copyright (c) 2011 - 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
 *
 ******************************************************************************/

package javax.persistence;

import java.util.Map;

/**
 * Represents an attribute node of an entity graph.
 *
 * @param  The type of the attribute.
 *
 * @see EntityGraph
 * @see Subgraph
 * @see NamedAttributeNode
 *
 * @since Java Persistence 2.1
 */
public interface AttributeNode {

    /**
     * Return the name of the attribute corresponding to the
     * attribute node.
     * @return name of the attribute
     */
    public String getAttributeName();

    /**
     * Return the Map<Class, Subgraph> of subgraphs associated
     * with this attribute node.
     * @return Map of subgraphs associated with this attribute node
     * or empty Map if none have been defined
     */
    public Map getSubgraphs();

    /**
     * Return the Map<Class, Subgraph> of subgraphs associated
     * with this attribute node's map key.
     * @return Map of subgraphs associated with this attribute 
     * node's map key or empty Map if none have been defined
     */
    public Map getKeySubgraphs();
}