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/*******************************************************************************
* Copyright (c) 2008, 2009 Sun Microsystems. 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 2.0 - Proposed Final Draft, Version 2.0 (August 31, 2009)
* Specification available from http://jcp.org/en/jsr/detail?id=317
*
* Java(TM) Persistence API, Version 2.0 - EARLY ACCESS
* This is an implementation of an early-draft specification developed under the
* Java Community Process (JCP). The code is untested and presumed not to be a
* compatible implementation of JSR 317: Java(TM) Persistence API, Version 2.0.
* We encourage you to migrate to an implementation of the Java(TM) Persistence
* API, Version 2.0 Specification that has been tested and verified to be compatible
* as soon as such an implementation is available, and we encourage you to retain
* this notice in any implementation of Java(TM) Persistence API, Version 2.0
* Specification that you distribute.
******************************************************************************/
package javax.persistence;
import java.util.List;
/**
* Interface for extracting the elements of a query result tuple.
*
* @see TupleElement
*
* @since Java Persistence 2.0
*/
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> X get(TupleElement<X> 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> X get(String alias, Class<X> 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> X get(int i, Class<X> 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<TupleElement<?>> getElements();
}