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/*
 * Copyright (c) 2008, 2023 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 jakarta.persistence.criteria;

import jakarta.persistence.metamodel.PluralAttribute;
import jakarta.persistence.metamodel.SingularAttribute;
import jakarta.persistence.metamodel.Bindable;
import jakarta.persistence.metamodel.MapAttribute;

/**
 * Represents a simple or compound attribute path from a 
 * bound type or collection, and is a "primitive" expression.
 *
 * @param   the type referenced by the path
 *
 * @since 2.0
 */
public interface Path extends Expression {

    /** 
     * Return the bindable object that corresponds to the path
     * expression.
     * @return bindable object corresponding to the path
     */
    Bindable getModel(); 
    
    /**
     * Return the parent "node" in the path or null if no parent.
     * @return parent
     */
    Path getParentPath();
	
    /**
     * Create a path corresponding to the referenced
     * single-valued attribute.
     * @param attribute single-valued attribute
     * @return path corresponding to the referenced attribute
     */
     Path get(SingularAttribute attribute);

    /**
     * Create a path corresponding to the referenced 
     * collection-valued attribute.
     * @param collection collection-valued attribute
     * @return expression corresponding to the referenced attribute
     */
    > Expression get(PluralAttribute collection);

    /**
     * Create a path corresponding to the referenced 
     * map-valued attribute.
     * @param map map-valued attribute
     * @return expression corresponding to the referenced attribute
     */
    > Expression get(MapAttribute map);

    /**
     * Create an expression corresponding to the type of the path.
     * @return expression corresponding to the type of the path
     */
    Expression> type();


    //String-based:
	
    /**
     * Create a path corresponding to the referenced attribute.
     * 
     * 

Note: Applications using the string-based API may need to * specify the type resulting from the {@link #get} operation in * order to avoid the use of {@code Path} variables. * *

For example: * {@snippet : * CriteriaQuery q = cb.createQuery(Person.class); * Root p = q.from(Person.class); * q.select(p) * .where(cb.isMember("joe", * p.>get("nicknames"))); * } *

rather than: * {@snippet : * CriteriaQuery q = cb.createQuery(Person.class); * Root p = q.from(Person.class); * Path> nicknames = p.get("nicknames"); * q.select(p) * .where(cb.isMember("joe", nicknames)); * } * * @param attributeName name of the attribute * @return path corresponding to the referenced attribute * @throws IllegalStateException if invoked on a path that * corresponds to a basic type * @throws IllegalArgumentException if attribute of the given * name does not otherwise exist */ Path get(String attributeName); }





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