org.apache.jena.atlas.lib.persistent

Interface PersistentMap<K,V,SelfType extends PersistentMap<K,V,SelfType>>

Type Parameters:

K - the type of keys in the map

V - the type of values in this map

SelfType - the self-type of implementing classes

All Known Implementing Classes:

PMap

public interface PersistentMap<K,V,SelfType extends PersistentMap<K,V,SelfType>>

A persistent map data structure.

Method Summary

Modifier and Type	Method and Description
Map<K,V>	asMap() An immutable view of this as a Map.
default boolean	containsKey(K key)
Stream<Map.Entry<K,V>>	entryStream()
default <R> Stream<R>	flatten(BiFunction<K,V,Stream<R>> f) Sends this map's entries through a flattening function.
default Optional<V>	get(K key)
SelfType	minus(K key)
SelfType	plus(K key, V value)

Method Detail

get

default Optional<V> get(K key)

Parameters:

key -

Returns:

the value indexed by key if it exists

plus

SelfType plus(K key,
              V value)

Parameters:

key -

value -

Returns:

a new SelfType with a new mapping from key to value

minus

SelfType minus(K key)

Parameters:

key -

Returns:

a new SelfType without the mapping indexed by key

containsKey

default boolean containsKey(K key)

Parameters:

key -

Returns:

whether this map contains an entry indexed by key

entryStream

Stream<Map.Entry<K,V>> entryStream()

Returns:

a Stream of map entries

flatten

default <R> Stream<R> flatten(BiFunction<K,V,Stream<R>> f)

Sends this map's entries through a flattening function.

Parameters:

f - a function that flattens one entry into a stream

Returns:

a stream of flattened entries

asMap

Map<K,V> asMap()

An immutable view of this as a Map.