javax.persistence.criteria.Selection Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2008 - 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
* Linda DeMichiel - Java Persistence 2.0
*
******************************************************************************/
package javax.persistence.criteria;
import javax.persistence.TupleElement;
import java.util.List;
/**
* The Selection interface defines an item that is to be
* returned in a query result.
*
* @param the type of the selection item
*
* @since Java Persistence 2.0
*/
public interface Selection extends TupleElement {
/**
* Assigns an alias to the selection item.
* Once assigned, an alias cannot be changed or reassigned.
* Returns the same selection item.
* @param name alias
* @return selection item
*/
Selection alias(String name);
/**
* Whether the selection item is a compound selection.
* @return boolean indicating whether the selection is a compound
* selection
*/
boolean isCompoundSelection();
/**
* Return the selection items composing a compound selection.
* Modifications to the list do not affect the query.
* @return list of selection items
* @throws IllegalStateException if selection is not a
* compound selection
*/
List> getCompoundSelectionItems();
}