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Java Enterprise Edition (EE)

MapJoin


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,java.util.Map<K,V>,V>, Selection<V>, TupleElement<V>
public interface MapJoin<Z,K,V>
extends PluralJoin<Z,java.util.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
 Expression<java.util.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.
 Path<V> value()
          Create a path expression that corresponds to the map value.
 
Methods inherited from interface javax.persistence.criteria.Join
getAttribute, getJoinType, getParent
 
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.Path
get, get, get, get, getParentPath, type
 
Methods inherited from interface javax.persistence.criteria.Expression
as, in, in, in, in, isNotNull, isNull
 
Methods inherited from interface javax.persistence.criteria.Selection
alias, getCompoundSelectionItems, isCompoundSelection
 
Methods inherited from interface javax.persistence.TupleElement
getAlias, getJavaType
 
Methods inherited from interface javax.persistence.criteria.FetchParent
fetch, fetch, fetch, fetch, fetch, fetch, getFetches
 

Method Detail

getModel

MapAttribute<? super Z,K,V> getModel()
Return the metamodel representation for the map attribute.

Specified by:
getModel in interface Path<V>
Specified by:
getModel in interface PluralJoin<Z,java.util.Map<K,V>,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<java.util.Map.Entry<K,V>> entry()
Create an expression that corresponds to the map entry.

Returns:
expression corresponding to the map entry


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