Package org.apache.druid.segment

Interface SegmentMapFunction

All Superinterfaces:

Function<Optional<Segment>,Optional<Segment>>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface SegmentMapFunction
extends Function<Optional<Segment>,Optional<Segment>>

Functional interface that captures the process of transforming a Segment to another Segment if possible.

The Segment returned by this method, if present, must always be closed by the caller.

Field Summary

Fields

Modifier and Type	Field	Description
static final SegmentMapFunction	IDENTITY	The identity function - returns the same segment

Method Summary

Modifier and Type	Method	Description
default SegmentMapFunction	thenMap(Function<Segment,Segment> mapFn)	Returns a SegmentMapFunction which first applies this SegmentMapFunction and then applies the supplied transformation function to the resulting Segment, if present.

Methods inherited from interface java.util.function.Function

andThen, apply, compose

Field Details

IDENTITY

static final SegmentMapFunction IDENTITY

The identity function - returns the same segment

Method Details

thenMap

default SegmentMapFunction thenMap(Function<Segment,Segment> mapFn)

Returns a SegmentMapFunction which first applies this SegmentMapFunction and then applies the supplied transformation function to the resulting Segment, if present.