Module swim.util

Package swim.util

Interface ReducedMap<K,V,U>

All Superinterfaces:

Iterable<Map.Entry<K,V>>, IterableMap<K,V>, Map<K,V>, OrderedMap<K,V>, SortedMap<K,V>

All Known Implementing Classes:

BTreeMap, BTreeMap, ValueReducedMap

public interface ReducedMap<K,V,U>
extends OrderedMap<K,V>

An OrderedMap that memoizes partial combinations of sub-elements to support efficient, incremental reduction of continuously mutating datasets.

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Method Summary

Modifier and Type	Method	Description
U	reduced(U identity, CombinerFunction<? super V,U> accumulator, CombinerFunction<U,U> combiner)	Returns the reduction of this ReducedMap, combining all contained elements with the given accumulator and combiner functions, recomputing only what has changed since the last invocation of reduced.

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll

Methods inherited from interface swim.util.OrderedMap

clear, comparator, containsKey, containsValue, entrySet, firstEntry, firstKey, firstValue, get, getEntry, getIndex, headMap, indexOf, isEmpty, iterator, keyIterator, keySet, lastEntry, lastKey, lastValue, nextEntry, nextKey, nextValue, previousEntry, previousKey, previousValue, put, putAll, remove, size, subMap, tailMap, valueIterator, values

Method Details

reduced

U reduced(U identity,
 CombinerFunction<? super V,U> accumulator,
 CombinerFunction<U,U> combiner)

Returns the reduction of this ReducedMap, combining all contained elements with the given accumulator and combiner functions, recomputing only what has changed since the last invocation of reduced. Stores partial computations to accelerate repeated reduction of continuously mutating datasets.