Package javax.persistence.criteria
Interface Expression<T>
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- 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:
- 2.0
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description <X> Expression<X>as(java.lang.Class<X> type)Perform a typecast upon the expression, returning a new expression object.Predicatein(java.lang.Object... values)Create a predicate to test whether the expression is a member of the argument list.Predicatein(java.util.Collection<?> values)Create a predicate to test whether the expression is a member of the collection.Predicatein(Expression<?>... values)Create a predicate to test whether the expression is a member of the argument list.Predicatein(Expression<java.util.Collection<?>> values)Create a predicate to test whether the expression is a member of the collection.PredicateisNotNull()Create a predicate to test whether the expression is not null.PredicateisNull()Create a predicate to test whether the expression is null.-
Methods inherited from interface javax.persistence.criteria.Selection
alias, getCompoundSelectionItems, isCompoundSelection
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Methods inherited from interface javax.persistence.TupleElement
getAlias, getJavaType
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Method Detail
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isNull
Predicate isNull()
Create a predicate to test whether the expression is null.- Returns:
- predicate testing whether the expression is null
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isNotNull
Predicate isNotNull()
Create a predicate to test whether the expression is not null.- Returns:
- predicate testing whether the expression is not null
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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
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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
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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
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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
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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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