javax.jdo.query

Interface OptionalExpression<T>

All Superinterfaces:

ComparableExpression<Optional<T>>, Expression<Optional<T>>

public interface OptionalExpression<T>
extends ComparableExpression<Optional<T>>

Representation of an Optional type in a query.

Method Summary

Modifier and Type	Method and Description
Expression<T>	get() Accessor for the object within the Optional.
BooleanExpression	isPresent() Accessor for whether there is an object within the Optional.
Expression<T>	orElse(Expression<T> other) Accessor for the value expression (if present), otherwise return the other expression.

Methods inherited from interface javax.jdo.query.ComparableExpression

asc, desc, gt, gt, gteq, gteq, lt, lt, lteq, lteq, max, min

Methods inherited from interface javax.jdo.query.Expression

as, cast, count, countDistinct, eq, eq, instanceOf, ne, ne

Method Detail

get

Expression<T> get()

Accessor for the object within the Optional.

Returns:

Expression for the object

isPresent

BooleanExpression isPresent()

Accessor for whether there is an object within the Optional.

Returns:

Whether there is an expression

orElse

Expression<T> orElse(Expression<T> other)

Accessor for the value expression (if present), otherwise return the other expression.

Parameters:

other - Other expression

Returns:

Return the value if present, otherwise return other