cascading.pipe.cogroup
Class RightJoin

java.lang.Object
  cascading.pipe.cogroup.RightJoin

All Implemented Interfaces:

Joiner, Serializable

public class RightJoin
extends Object
implements Joiner

Class RightJoin will return an RightJoin.JoinIterator that will iterate over a given Joiner and return tuples that represent a left outer, right inner join of the CoGrouper internal grouped tuple collections.

Note only the farthest left tuple stream will be used as the outer join. All following joins to the right will be inner joins. See MixedJoin for more flexibility.

See Also:

MixedJoin, Serialized Form

Nested Class Summary

protected static class

RightJoin.JoinIterator

Constructor Summary

RightJoin()

Method Summary

Iterator<Tuple>	getIterator(GroupClosure closure) Returns an interator that joins the given CoGroupClosure co-groups.
int	numJoins() Returns the number of joins this instance can handle.

Methods inherited from class java.lang.Object

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

Constructor Detail

RightJoin

public RightJoin()

Method Detail

getIterator

public Iterator<Tuple> getIterator(GroupClosure closure)

Description copied from interface: Joiner

Returns an interator that joins the given CoGroupClosure co-groups.

Specified by:

getIterator in interface Joiner

Parameters:

closure - of type GroupClosure

Returns:

an iterator

numJoins

public int numJoins()

Description copied from interface: Joiner

Returns the number of joins this instance can handle. A value of -1 denotes there is no limit.

Specified by:

numJoins in interface Joiner

Returns:

an int