org.apache.openjpa.jdbc.meta
Class JDBCRelatedFieldOrder

java.lang.Object
  org.apache.openjpa.jdbc.meta.JDBCRelatedFieldOrder

All Implemented Interfaces:

Serializable, JDBCOrder, Order

 class JDBCRelatedFieldOrder
extends Object
implements JDBCOrder

Use the database to order by a field in the related type.

Author:

Abe White

Field Summary

Fields inherited from interface org.apache.openjpa.meta.Order

ELEMENT

Constructor Summary

JDBCRelatedFieldOrder(FieldMapping owner, FieldMapping rel, boolean asc)

Method Summary

Comparator	getComparator() Return a comparator for ordering by this element, or null if the ordering is done in the datastore.
String	getName() Return the name of the orderable.
boolean	isAscending() Order direction.
boolean	isInRelation() Whether the value is a member of the field's related type, rather than columns of the field itself.
void	order(Select sel, ClassMapping elem, Joins joins) Order by this value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JDBCRelatedFieldOrder

public JDBCRelatedFieldOrder(FieldMapping owner,
                             FieldMapping rel,
                             boolean asc)

Method Detail

getName

public String getName()

Description copied from interface: Order

Return the name of the orderable.

Specified by:

getName in interface Order

isAscending

public boolean isAscending()

Description copied from interface: Order

Order direction.

Specified by:

isAscending in interface Order

getComparator

public Comparator getComparator()

Description copied from interface: Order

Return a comparator for ordering by this element, or null if the ordering is done in the datastore.

Specified by:

getComparator in interface Order

isInRelation

public boolean isInRelation()

Description copied from interface: JDBCOrder

Whether the value is a member of the field's related type, rather than columns of the field itself.

Specified by:

isInRelation in interface JDBCOrder

order

public void order(Select sel,
                  ClassMapping elem,
                  Joins joins)

Description copied from interface: JDBCOrder

Order by this value.

Specified by:

order in interface JDBCOrder

elem - if this value has independent mappings, the mapping we're selecting