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The Java Persistence API (JPA) : a standard interface-based Java model abstraction of persistence, developed by the JCP.
/*
* Copyright (c) 2008, 2009, 2011 Oracle, Inc. 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.
*/
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
*/
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();
}
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