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Java Enterprise Edition (EE)

Expression


javax.persistence.criteria
Interface Expression<T>

Type Parameters:
T - the type of the expression
All Superinterfaces:
Selection<T>, TupleElement<T>
All Known Subinterfaces:
CollectionJoin<Z,E>, CriteriaBuilder.Case<R>, CriteriaBuilder.Coalesce<T>, CriteriaBuilder.In<T>, CriteriaBuilder.SimpleCase<C,R>, 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 Expression<T>
extends Selection<T>

Type for query expressions.

Since:
Java Persistence 2.0

Method Summary
<X> Expression<X>
as(java.lang.Class<X> type)
          Perform a typecast upon the expression, returning a new expression object.
 Predicate in(java.util.Collection<?> values)
          Create a predicate to test whether the expression is a member of the collection.
 Predicate in(Expression<?>... values)
          Create a predicate to test whether the expression is a member of the argument list.
 Predicate in(Expression<java.util.Collection<?>> values)
          Create a predicate to test whether the expression is a member of the collection.
 Predicate in(java.lang.Object... values)
          Create a predicate to test whether the expression is a member of the argument list.
 Predicate isNotNull()
          Create a predicate to test whether the expression is not null.
 Predicate isNull()
          Create a predicate to test whether the expression is null.
 
Methods inherited from interface javax.persistence.criteria.Selection
alias, getCompoundSelectionItems, isCompoundSelection
 
Methods inherited from interface javax.persistence.TupleElement
getAlias, getJavaType
 

Method Detail

isNull

Predicate isNull()
Create a predicate to test whether the expression is null.

Returns:
predicate testing whether the expression is null

isNotNull

Predicate isNotNull()
Create a predicate to test whether the expression is not null.

Returns:
predicate testing whether the expression is not null

in

Predicate in(java.lang.Object... values)
Create a predicate to test whether the expression is a member of the argument list.

Parameters:
values - values to be tested against
Returns:
predicate testing for membership

in

Predicate in(Expression<?>... values)
Create a predicate to test whether the expression is a member of the argument list.

Parameters:
values - expressions to be tested against
Returns:
predicate testing for membership

in

Predicate in(java.util.Collection<?> values)
Create a predicate to test whether the expression is a member of the collection.

Parameters:
values - collection of values to be tested against
Returns:
predicate testing for membership

in

Predicate in(Expression<java.util.Collection<?>> values)
Create a predicate to test whether the expression is a member of the collection.

Parameters:
values - expression corresponding to collection to be tested against
Returns:
predicate testing for membership

as

<X> Expression<X> as(java.lang.Class<X> type)
Perform a typecast upon the expression, returning a new expression object. This method does not cause type conversion: the runtime type is not changed. Warning: may result in a runtime failure.

Parameters:
type - intended type of the expression
Returns:
new expression of the given type


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