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org.apache.crunch
Class CombineFn.FirstNAggregator<V>

java.lang.Object
  org.apache.crunch.CombineFn.FirstNAggregator<V>

All Implemented Interfaces:

Serializable, CombineFn.Aggregator<V>

Enclosing class:

CombineFn<S,T>

public static class CombineFn.FirstNAggregator<V>
extends Object
implements CombineFn.Aggregator<V>

See Also:

Serialized Form

Constructor Summary

CombineFn.FirstNAggregator(int arity)

Method Summary

void	reset() Clears the internal state of this Aggregator and prepares it for the values associated with the next key.
Iterable<V>	results() Returns the current aggregated state of this instance.
void	update(V value) Incorporate the given value into the aggregate state maintained by this instance.

Methods inherited from class java.lang.Object

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

Constructor Detail

CombineFn.FirstNAggregator

public CombineFn.FirstNAggregator(int arity)

Method Detail

reset

public void reset()

Description copied from interface: CombineFn.Aggregator

Clears the internal state of this Aggregator and prepares it for the values associated with the next key.

Specified by:

reset in interface CombineFn.Aggregator<V>

update

public void update(V value)

Description copied from interface: CombineFn.Aggregator

Incorporate the given value into the aggregate state maintained by this instance.

Specified by:

update in interface CombineFn.Aggregator<V>

results

public Iterable<V> results()

Description copied from interface: CombineFn.Aggregator

Returns the current aggregated state of this instance.

Specified by:

results in interface CombineFn.Aggregator<V>