org.apache.druid.common.guava

Class CombiningSequence<T>

java.lang.Object

org.apache.druid.common.guava.CombiningSequence<T>

All Implemented Interfaces:

Sequence<T>

public class CombiningSequence<T>
extends Object
implements Sequence<T>

Method Summary

Modifier and Type	Method and Description
<OutType> OutType	accumulate(OutType initValue, Accumulator<OutType,T> accumulator) Accumulate this sequence using the given accumulator.
static <T> CombiningSequence<T>	create(Sequence<T> baseSequence, Comparator<T> ordering, BinaryOperator<T> mergeFn)
<OutType> Yielder<OutType>	toYielder(OutType initValue, YieldingAccumulator<OutType,T> accumulator) Return a Yielder for accumulated sequence.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.java.util.common.guava.Sequence

filter, flatMap, flatMerge, forEach, limit, map, skip, toList, withBaggage, withEffect

Method Detail

create

public static <T> CombiningSequence<T> create(Sequence<T> baseSequence,
                                              Comparator<T> ordering,
                                              BinaryOperator<T> mergeFn)

accumulate

public <OutType> OutType accumulate(OutType initValue,
                                    Accumulator<OutType,T> accumulator)

Description copied from interface: Sequence

Accumulate this sequence using the given accumulator.

Specified by:

accumulate in interface Sequence<T>

Type Parameters:

OutType - the type of accumulated value.

Parameters:

initValue - the initial value to pass along to start the accumulation.

accumulator - the accumulator which is responsible for accumulating input values.

Returns:

accumulated value.

toYielder

public <OutType> Yielder<OutType> toYielder(OutType initValue,
                                            YieldingAccumulator<OutType,T> accumulator)

Description copied from interface: Sequence

Return a Yielder for accumulated sequence.

Specified by:

toYielder in interface Sequence<T>

Type Parameters:

OutType - the type of accumulated value.

Parameters:

initValue - the initial value to pass along to start the accumulation.

accumulator - the accumulator which is responsible for accumulating input values.

Returns:

a Yielder for accumulated sequence.

See Also:

Yielder