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org.apache.crunch
Class CombineFn.SimpleAggregator<T>

java.lang.Object
  org.apache.crunch.CombineFn.SimpleAggregator<T>

All Implemented Interfaces:

Serializable, CombineFn.Aggregator<T>

Direct Known Subclasses:

CombineFn.FirstNAggregator, CombineFn.LastNAggregator, CombineFn.MaxBigInts, CombineFn.MaxDoubles, CombineFn.MaxFloats, CombineFn.MaxInts, CombineFn.MaxLongs, CombineFn.MaxNAggregator, CombineFn.MinBigInts, CombineFn.MinDoubles, CombineFn.MinFloats, CombineFn.MinInts, CombineFn.MinLongs, CombineFn.MinNAggregator, CombineFn.StringConcatAggregator, CombineFn.SumBigInts, CombineFn.SumDoubles, CombineFn.SumFloats, CombineFn.SumInts, CombineFn.SumLongs

Enclosing class:

CombineFn<S,T>

public abstract static class CombineFn.SimpleAggregator<T>
extends Object
implements CombineFn.Aggregator<T>

Base class for aggregators that do not require any initialization.

See Also:

Serialized Form

Constructor Summary

CombineFn.SimpleAggregator()

Method Summary

void	initialize(org.apache.hadoop.conf.Configuration conf) Perform any setup of this instance that is required prior to processing inputs.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.crunch.CombineFn.Aggregator

reset, results, update

Constructor Detail

CombineFn.SimpleAggregator

public CombineFn.SimpleAggregator()

Method Detail

initialize

public void initialize(org.apache.hadoop.conf.Configuration conf)

Description copied from interface: CombineFn.Aggregator

Perform any setup of this instance that is required prior to processing inputs.

Specified by:

initialize in interface CombineFn.Aggregator<T>