org.apache.beam.sdk.transforms

Class Min.MinLongFn

java.lang.Object

org.apache.beam.sdk.transforms.Combine.CombineFn<Long,long[],Long>

org.apache.beam.sdk.transforms.Combine.BinaryCombineLongFn

org.apache.beam.sdk.transforms.Min.MinLongFn

All Implemented Interfaces:

Serializable, CombineFnBase.GlobalCombineFn<Long,long[],Long>, HasDisplayData, org.apache.beam.sdk.util.common.CounterProvider<Long>

Enclosing class:

Min

public static class Min.MinLongFn
extends Combine.BinaryCombineLongFn
implements org.apache.beam.sdk.util.common.CounterProvider<Long>

A CombineFn that computes the minimum of a collection of Longs, useful as an argument to Combine.globally(org.apache.beam.sdk.transforms.SerializableFunction<java.lang.Iterable<V>, V>) or Combine.perKey(org.apache.beam.sdk.transforms.SerializableFunction<java.lang.Iterable<V>, V>).

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
MinLongFn()

Method Summary

Modifier and Type	Method and Description
long	apply(long left, long right) Applies the binary operation to the two operands, returning the result.
TypeVariable<?>	getAccumTVariable() Returns the TypeVariable of AccumT.
org.apache.beam.sdk.util.common.Counter<Long>	getCounter(String name)
String	getIncompatibleGlobalWindowErrorMessage() Returns the error message for not supported default values in Combine.globally().
TypeVariable<?>	getInputTVariable() Returns the TypeVariable of InputT.
TypeVariable<?>	getOutputTVariable() Returns the TypeVariable of OutputT.
long	identity() Returns the identity element of this operation, i.e.
void	populateDisplayData(DisplayData.Builder builder) Register display data for the given transform or component.

Methods inherited from class org.apache.beam.sdk.transforms.Combine.BinaryCombineLongFn

addInput, createAccumulator, extractOutput, getAccumulatorCoder, getDefaultOutputCoder, mergeAccumulators

Methods inherited from class org.apache.beam.sdk.transforms.Combine.CombineFn

apply, asKeyedFn, compact, defaultValue, getOutputType

Methods inherited from class java.lang.Object

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

Constructor Detail

MinLongFn

public MinLongFn()

Method Detail

apply

public long apply(long left,
                  long right)

Description copied from class: Combine.BinaryCombineLongFn

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

Specified by:

apply in class Combine.BinaryCombineLongFn

identity

public long identity()

Description copied from class: Combine.BinaryCombineLongFn

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.BinaryCombineLongFn

getCounter

public org.apache.beam.sdk.util.common.Counter<Long> getCounter(String name)

Specified by:

getCounter in interface org.apache.beam.sdk.util.common.CounterProvider<Long>

Overrides:

getCounter in class Combine.BinaryCombineLongFn

getIncompatibleGlobalWindowErrorMessage

public String getIncompatibleGlobalWindowErrorMessage()

Description copied from interface: CombineFnBase.GlobalCombineFn

Returns the error message for not supported default values in Combine.globally().

Specified by:

getIncompatibleGlobalWindowErrorMessage in interface CombineFnBase.GlobalCombineFn<InputT,AccumT,OutputT>

getInputTVariable

public TypeVariable<?> getInputTVariable()

Returns the TypeVariable of InputT.

getAccumTVariable

public TypeVariable<?> getAccumTVariable()

Returns the TypeVariable of AccumT.

getOutputTVariable

public TypeVariable<?> getOutputTVariable()

Returns the TypeVariable of OutputT.

populateDisplayData

public void populateDisplayData(DisplayData.Builder builder)

Register display data for the given transform or component.

populateDisplayData(DisplayData.Builder) is invoked by Pipeline runners to collect display data via DisplayData.from(HasDisplayData). Implementations may call super.populateDisplayData(builder) in order to register display data in the current namespace, but should otherwise use subcomponent.populateDisplayData(builder) to use the namespace of the subcomponent.

By default, does not register any display data. Implementors may override this method to provide their own display data.

Specified by:

populateDisplayData in interface HasDisplayData

Parameters:

builder - The builder to populate with display data.

See Also:

HasDisplayData