Interface Selection<X>

Type Parameters:
X - the type of the selection item
All Superinterfaces:
TupleElement<X>
All Known Subinterfaces:
CollectionJoin<Z,E>, CompoundSelection<X>, CriteriaBuilder.Case<R>, CriteriaBuilder.Coalesce<T>, CriteriaBuilder.In<T>, CriteriaBuilder.SimpleCase<C,R>, Expression<T>, From<Z,X>, Join<Z,X>, ListJoin<Z,E>, MapJoin<Z,K,V>, ParameterExpression<T>, Path<X>, PluralJoin<Z,C,E>, Predicate, 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 a query result.
Since:
Java Persistence 2.0
  • Method Details

    • alias

      Selection<X> alias(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

      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:
      IllegalStateException - if selection is not a compound selection