javax.persistence.criteria
Interface Selection<X>

Type Parameters:

X - the type of the selection item

All Superinterfaces:

TupleElement<X>

All Known Subinterfaces:

CollectionJoin<Z,E>, CompoundSelection<X>, Expression<T>, From<Z,X>, Join<Z,X>, ListJoin<Z,E>, MapJoin<Z,K,V>, ParameterExpression<T>, Path<X>, PluralJoin<Z,C,E>, Predicate, QueryBuilder.Case<R>, QueryBuilder.Coalesce<T>, QueryBuilder.In<T>, QueryBuilder.SimpleCase<C,R>, Root<X>, SetJoin<Z,E>, Subquery<T>

public interface Selection<X>
extends TupleElement<X>

The Selection interface defines an item that is to be returned in the query result.

Since:

Java Persistence 2.0

Method Summary

Selection<X>	alias(java.lang.String name) Assigns an alias to the selection item.
java.util.List<Selection<?>>	getCompoundSelectionItems() Return the selection items composing a compound selection.
boolean	isCompoundSelection() Whether the selection item is a compound selection.

Methods inherited from interface javax.persistence.TupleElement

getAlias, getJavaType

Method Detail

alias

Selection<X> alias(java.lang.String name)

Assigns an alias to the selection item. Once assigned, an alias cannot be changed or reassigned. Returns the same selection item.

Parameters:

name - alias

Returns:

selection item

isCompoundSelection

boolean isCompoundSelection()

Whether the selection item is a compound selection.

Returns:

boolean indicating whether the selection is a compound selection

getCompoundSelectionItems

java.util.List<Selection<?>> getCompoundSelectionItems()

Return the selection items composing a compound selection. Modifications to the list do not affect the query.

Returns:

list of selection items

Throws:

java.lang.IllegalStateException - if selection is not a compound selection