Join (EclipseLink 2.7.15, API Reference)

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

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Attribute<? super Z,?>`	`getAttribute()`	Return the metamodel attribute corresponding to the join.
`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<java.lang.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 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.Path
get, get, get, get, getModel, getParentPath, type

Methods inherited from interface javax.persistence.criteria.Selection
alias, getCompoundSelectionItems, isCompoundSelection

Methods inherited from interface javax.persistence.TupleElement
getAlias, getJavaType

- Method Detail
  - on
```
Join<Z,X> on(Expression<java.lang.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 corresponding to the join.
    
    Returns:
    
    metamodel attribute corresponding to the join
  - getParent
```
From<?,Z> getParent()
```
    Return the parent of the join.
    
    Returns:
    
    join parent
  - getJoinType
```
JoinType getJoinType()
```
    Return the join type.
    
    Returns:
    
    join type