com.google.cloud.dataflow.sdk.transforms

Class Max.MaxFn<T>

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.Combine.CombineFn<V,Combine.Holder<V>,V>

com.google.cloud.dataflow.sdk.transforms.Combine.BinaryCombineFn<T>

com.google.cloud.dataflow.sdk.transforms.Max.MaxFn<T>

Type Parameters:

T - the type of the values being compared

All Implemented Interfaces:

CombineFnBase.GlobalCombineFn<T,Combine.Holder<T>,T>, Serializable

Direct Known Subclasses:

Max.MaxDoubleFn, Max.MaxIntegerFn, Max.MaxLongFn

Enclosing class:

Max

public static class Max.MaxFn<T>
extends Combine.BinaryCombineFn<T>

A CombineFn that computes the maximum of a collection of elements of type T using an arbitrary Comparator, 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

Method Summary

Modifier and Type	Method and Description
T	apply(T left, T right) Applies the binary operation to the two operands, returning the result.
TypeVariable<?>	getAccumTVariable() Returns the TypeVariable of AccumT.
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.
T	identity() Returns the value that should be used for the combine of the empty set.
static <T extends Comparable<? super T>> Max.MaxFn<T>	naturalOrder()
static <T extends Comparable<? super T>> Max.MaxFn<T>	naturalOrder(T identity)
static <T,ComparatorT extends Comparator<? super T> & Serializable> Max.MaxFn<T>	of(ComparatorT comparator)
static <T,ComparatorT extends Comparator<? super T> & Serializable> Max.MaxFn<T>	of(T identity, ComparatorT comparator)

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

addInput, createAccumulator, extractOutput, getAccumulatorCoder, getDefaultOutputCoder, mergeAccumulators

Methods inherited from class com.google.cloud.dataflow.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

Method Detail

of

public static <T,ComparatorT extends Comparator<? super T> & Serializable> Max.MaxFn<T> of(T identity,
                                                                                           ComparatorT comparator)

of

public static <T,ComparatorT extends Comparator<? super T> & Serializable> Max.MaxFn<T> of(ComparatorT comparator)

naturalOrder

public static <T extends Comparable<? super T>> Max.MaxFn<T> naturalOrder(T identity)

naturalOrder

public static <T extends Comparable<? super T>> Max.MaxFn<T> naturalOrder()

identity

public T identity()

Description copied from class: Combine.BinaryCombineFn

Returns the value that should be used for the combine of the empty set.

Overrides:

identity in class Combine.BinaryCombineFn<T>

apply

public T apply(T left,
               T right)

Description copied from class: Combine.BinaryCombineFn

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

Specified by:

apply in class Combine.BinaryCombineFn<T>

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.