Module jakarta.persistence

Package jakarta.persistence.criteria

Interface Join<Z,X>

Type Parameters:

Z - the source type of the join

X - the target type of the join

All Superinterfaces:

Expression<X>, FetchParent<Z,X>, From<Z,X>, Path<X>, Selection<X>, TupleElement<X>

All Known Subinterfaces:

CollectionJoin<Z,E>, ListJoin<Z,E>, MapJoin<Z,K,V>, PluralJoin<Z,C,E>, SetJoin<Z,E>

public interface Join<Z,X>
extends From<Z,X>

A join to an entity, embeddable, or basic type.

Since:

2.0

Method Summary

Modifier and Type	Method	Description
Attribute<? super Z,?>	getAttribute()	Return the metamodel attribute representing the join target, if any, or null if the target of the join is an entity type.
JoinType	getJoinType()	Return the join type.
Predicate	getOn()	Return the predicate that corresponds to the ON restriction(s) on the join, or null if no ON condition has been specified.
From<?,Z>	getParent()	Return the parent of the join.
Join<Z,X>	on(Expression<Boolean> restriction)	Modify the join to restrict the result according to the specified ON condition and return the join object.
Join<Z,X>	on(Predicate... restrictions)	Modify the join to restrict the result according to the specified ON condition and return the join object.

Methods inherited from interface jakarta.persistence.criteria.Expression

as, cast, equalTo, equalTo, in, in, in, in, isNotNull, isNull, notEqualTo, notEqualTo

Methods inherited from interface jakarta.persistence.criteria.FetchParent

fetch, fetch, fetch, fetch, fetch, fetch, getFetches

Methods inherited from interface jakarta.persistence.criteria.From

getCorrelationParent, getJoins, isCorrelated, join, join, join, join, join, join, join, join, join, join, join, join, join, join, join, join, joinCollection, joinCollection, joinList, joinList, joinMap, joinMap, joinSet, joinSet

Methods inherited from interface jakarta.persistence.criteria.Path

get, get, get, get, getModel, getParentPath, type

Methods inherited from interface jakarta.persistence.criteria.Selection

alias, getCompoundSelectionItems, isCompoundSelection

Methods inherited from interface jakarta.persistence.TupleElement

getAlias, getJavaType

Method Details

on

Join<Z,X> on(Expression<Boolean> restriction)

Modify the join to restrict the result according to the specified ON condition and return the join object. Replaces the previous ON condition, if any.

Parameters:

restriction - a simple or compound boolean expression

Returns:

the modified join object

Since:

2.1

on

Join<Z,X> on(Predicate... restrictions)

Modify the join to restrict the result according to the specified ON condition and return the join object. Replaces the previous ON condition, if any.

Parameters:

restrictions - zero or more restriction predicates

Returns:

the modified join object

Since:

2.1

getOn

Predicate getOn()

Return the predicate that corresponds to the ON restriction(s) on the join, or null if no ON condition has been specified.

Returns:

the ON restriction predicate

Since:

2.1

getAttribute

Attribute<? super Z,?> getAttribute()

Return the metamodel attribute representing the join target, if any, or null if the target of the join is an entity type.

Returns:

metamodel attribute or null

getParent

From<?,Z> getParent()

Return the parent of the join.

Returns:

join parent

getJoinType

JoinType getJoinType()

Return the join type.

Returns:

join type