javax.persistence.criteria.Selection Maven / Gradle / Ivy
// $Id: Selection.java 17752 2009-10-15 01:19:21Z [email protected] $
// EJB3 Specification Copyright 2004-2009 Sun Microsystems, Inc.
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();
}