Package javax.persistence.criteria

Interface MapJoin<Z,K,V>

Type Parameters:

Z - the source type of the join

K - the type of the target Map key

V - the type of the target Map value

All Superinterfaces:

Expression<V>, FetchParent<Z,V>, From<Z,V>, Join<Z,V>, Path<V>, PluralJoin<Z,Map<K,V>,V>, Selection<V>, TupleElement<V>

public interface MapJoin<Z,K,V>
extends PluralJoin<Z,Map<K,V>,V>

The MapJoin interface is the type of the result of joining to a collection over an association or element collection that has been specified as a java.util.Map.

Since:

Java Persistence 2.0

Method Summary

Modifier and Type	Method	Description
Expression<Map.Entry<K,V>>	entry()	Create an expression that corresponds to the map entry.
MapAttribute<? super Z,K,V>	getModel()	Return the metamodel representation for the map attribute.
Path<K>	key()	Create a path expression that corresponds to the map key.
MapJoin<Z,K,V>	on(Expression<Boolean> restriction)	Modify the join to restrict the result according to the specified ON condition and return the join object.
MapJoin<Z,K,V>	on(Predicate... restrictions)	Modify the join to restrict the result according to the specified ON condition and return the join object.
Path<V>	value()	Create a path expression that corresponds to the map value.

Methods inherited from interface javax.persistence.criteria.Expression

as, in, in, in, in, isNotNull, isNull

Methods inherited from interface javax.persistence.criteria.FetchParent

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

Methods inherited from interface javax.persistence.criteria.From

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

Methods inherited from interface javax.persistence.criteria.Join

getAttribute, getJoinType, getOn, getParent

Methods inherited from interface javax.persistence.criteria.Path

get, get, get, get, getParentPath, type

Methods inherited from interface javax.persistence.criteria.Selection

alias, getCompoundSelectionItems, isCompoundSelection

Methods inherited from interface javax.persistence.TupleElement

getAlias, getJavaType

Method Details

on

MapJoin<Z,K,V> 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.

Specified by:

on in interface Join<Z,K>

Parameters:

restriction - a simple or compound boolean expression

Returns:

the modified join object

Since:

Java Persistence 2.1

on

MapJoin<Z,K,V> 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.

Specified by:

on in interface Join<Z,K>

Parameters:

restrictions - zero or more restriction predicates

Returns:

the modified join object

Since:

Java Persistence 2.1

getModel

MapAttribute<? super Z,K,V> getModel()

Return the metamodel representation for the map attribute.

Specified by:

getModel in interface Path<Z>

Specified by:

getModel in interface PluralJoin<Z,K,V>

Returns:

metamodel type representing the Map that is the target of the join

key

Path<K> key()

Create a path expression that corresponds to the map key.

Returns:

path corresponding to map key

value

Path<V> value()

Create a path expression that corresponds to the map value. This method is for stylistic use only: it just returns this.

Returns:

path corresponding to the map value

entry

Expression<Map.Entry<K,V>> entry()

Create an expression that corresponds to the map entry.

Returns:

expression corresponding to the map entry