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Hibernate developmental JSR 317 (Java Persistence API 2.0) contracts. Used to allow incremental implementation of features on the way to full JPA 2.0 support.

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// $Id:$
// EJB3 Specification Copyright 2004-2009 Sun Microsystems, Inc.
package javax.persistence;

import java.util.List;

/**
 * Interface for extracting the elements of a query result tuple.
 */
public interface Tuple {

    /**
     * Get the value of the specified tuple element.
     * @param tupleElement  tuple element
     * @return value of tuple element
     * @throws IllegalArgumentException if tuple element
     *         does not correspond to an element in the
     *         query result tuple
     */
     X get(TupleElement tupleElement);

    /**
     * Get the value of the tuple element to which the
     * specified alias has been assigned.
     * @param alias  alias assigned to tuple element
     * @param type of the tuple element
     * @return value of the tuple element
     * @throws IllegalArgumentException if alias
     *         does not correspond to an element in the
     *         query result tuple or element cannot be
     *         assigned to the specified type
     */
     X get(String alias, Class type);

    /**
     * Get the value of the tuple element to which the
     * specified alias has been assigned.
     * @param alias  alias assigned to tuple element
     * @return value of the tuple element
     * @throws IllegalArgumentException if alias
     *         does not correspond to an element in the
     *         query result tuple
     */
    Object get(String alias);

    /**
     * Get the value of the element at the specified
     * position in the result tuple. The first position is 0.
     * @param i  position in result tuple
     * @param type  type of the tuple element
     * @return value of the tuple element
     * @throws IllegalArgumentException if i exceeds
     *         length of result tuple  or element cannot be
     *         assigned to the specified type
     */
     X get(int i, Class type);

    /**
     * Get the value of the element at the specified
     * position in the result tuple. The first position is 0.
     * @param i  position in result tuple
     * @return value of the tuple element
     * @throws IllegalArgumentException if i exceeds
     *         length of result tuple
     */
    Object get(int i);

    /**
     * Return the values of the result tuple elements as an array.
     * @return tuple element values
     */
    Object[] toArray();

    /**
     * Return the tuple elements
     * @return tuple elements
     */
    List> getElements();
}