com.google.cloud.dataflow.sdk.transforms

Class Sum.SumDoubleFn

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.Combine.CombineFn<Double,double[],Double>

com.google.cloud.dataflow.sdk.transforms.Combine.BinaryCombineDoubleFn

com.google.cloud.dataflow.sdk.transforms.Sum.SumDoubleFn

All Implemented Interfaces:

com.google.cloud.dataflow.sdk.util.common.CounterProvider<Double>, Serializable

Enclosing class:

Sum

public static class Sum.SumDoubleFn
extends Combine.BinaryCombineDoubleFn

A SerializableFunction that computes the sum of an Iterable of Doubles, useful as an argument to Combine.globally(com.google.cloud.dataflow.sdk.transforms.SerializableFunction<java.lang.Iterable<V>, V>) or Combine.perKey(com.google.cloud.dataflow.sdk.transforms.SerializableFunction<java.lang.Iterable<V>, V>).

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
SumDoubleFn()

Method Summary

Modifier and Type	Method and Description
double	apply(double a, double b) Applies the binary operation to the two operands, returning the result.
com.google.cloud.dataflow.sdk.util.common.Counter<Double>	getCounter(String name)
double	identity() Returns the identity element of this operation, i.e.

Methods inherited from class com.google.cloud.dataflow.sdk.transforms.Combine.BinaryCombineDoubleFn

addInput, createAccumulator, extractOutput, getAccumulatorCoder, getDefaultOutputCoder, mergeAccumulators

Methods inherited from class com.google.cloud.dataflow.sdk.transforms.Combine.CombineFn

apply, asKeyedFn, getOutputType

Methods inherited from class java.lang.Object

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

Constructor Detail

SumDoubleFn

public SumDoubleFn()

Method Detail

apply

public double apply(double a,
                    double b)

Description copied from class: Combine.BinaryCombineDoubleFn

Applies the binary operation to the two operands, returning the result.

Specified by:

apply in class Combine.BinaryCombineDoubleFn

identity

public double identity()

Description copied from class: Combine.BinaryCombineDoubleFn

Returns the identity element of this operation, i.e. an element e such that apply(e, x) == apply(x, e) == x for all values of x.

Specified by:

identity in class Combine.BinaryCombineDoubleFn

getCounter

public com.google.cloud.dataflow.sdk.util.common.Counter<Double> getCounter(String name)