Package io.vavr.collection

Class LinkedHashMap<K,V>

java.lang.Object

io.vavr.collection.LinkedHashMap<K,V>

All Implemented Interfaces:

Foldable<Tuple2<K,V>>, Map<K,V>, Traversable<Tuple2<K,V>>, Function1<K,V>, PartialFunction<K,V>, Value<Tuple2<K,V>>, Serializable, Iterable<Tuple2<K,V>>, Function<K,V>

public final class LinkedHashMap<K,V>
extends Object
implements Map<K,V>, Serializable

An immutable LinkedHashMap implementation that has predictable (insertion-order) iteration.

Author:

Ruslan Sennov

See Also:

• Serialized Form

Method Summary

Modifier and Type	Method	Description
<K2, V2> LinkedHashMap<K2,V2>	bimap(Function<? super K,? extends K2> keyMapper, Function<? super V,? extends V2> valueMapper)	Maps this Map to a new Map with different component type by applying a function to its elements.
static <K, V> Collector<Tuple2<K,V>,ArrayList<Tuple2<K,V>>,LinkedHashMap<K,V>>	collector()	Returns a Collector which may be used in conjunction with Stream.collect(java.util.stream.Collector) to obtain a LinkedHashMap.
static <K, V, T extends V> Collector<T,ArrayList<T>,LinkedHashMap<K,V>>	collector(Function<? super T,? extends K> keyMapper)	Returns a Collector which may be used in conjunction with Stream.collect(java.util.stream.Collector) to obtain a LinkedHashMap.
static <K, V, T> Collector<T,ArrayList<T>,LinkedHashMap<K,V>>	collector(Function<? super T,? extends K> keyMapper, Function<? super T,? extends V> valueMapper)	Returns a Collector which may be used in conjunction with Stream.collect(java.util.stream.Collector) to obtain a LinkedHashMap.
Tuple2<V,LinkedHashMap<K,V>>	computeIfAbsent(K key, Function<? super K,? extends V> mappingFunction)	If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map.
Tuple2<Option<V>,LinkedHashMap<K,V>>	computeIfPresent(K key, BiFunction<? super K,? super V,? extends V> remappingFunction)	If the value for the specified key is present, attempts to compute a new mapping given the key and its current mapped value.
boolean	containsKey(K key)	Returns true if this map contains a mapping for the specified key.
LinkedHashMap<K,V>	distinct()	Returns a new version of this which contains no duplicates.
LinkedHashMap<K,V>	distinctBy(Comparator<? super Tuple2<K,V>> comparator)	Returns a new version of this which contains no duplicates.
<U> LinkedHashMap<K,V>	distinctBy(Function<? super Tuple2<K,V>,? extends U> keyExtractor)	Returns a new version of this which contains no duplicates.
LinkedHashMap<K,V>	drop(int n)	Drops the first n elements of this or all elements, if this length < n.
LinkedHashMap<K,V>	dropRight(int n)	Drops the last n elements of this or all elements, if this length < n.
LinkedHashMap<K,V>	dropUntil(Predicate<? super Tuple2<K,V>> predicate)	Drops elements until the predicate holds for the current element.
LinkedHashMap<K,V>	dropWhile(Predicate<? super Tuple2<K,V>> predicate)	Drops elements while the predicate holds for the current element.
static <K, V> LinkedHashMap<K,V>	empty()
boolean	equals(Object o)	In Vavr there are four basic classes of collections: Seq (sequential elements) Set (distinct elements) Map (indexed elements) Multimap (indexed collections) Two collection instances of these classes are equal if and only if both collections belong to the same basic collection class (Seq, Set, Map or Multimap) contain the same elements have the same element order, if the collections are of type Seq Two Map/Multimap elements, resp. entries, (key1, value1) and (key2, value2) are equal, if the keys are equal and the values are equal.
static <K, V> LinkedHashMap<K,V>	fill(int n, Supplier<? extends Tuple2<? extends K,? extends V>> s)	Returns a LinkedHashMap containing tuples returned by n calls to a given Supplier s.
LinkedHashMap<K,V>	filter(BiPredicate<? super K,? super V> predicate)	Returns a new Map consisting of all elements which satisfy the given predicate.
LinkedHashMap<K,V>	filter(Predicate<? super Tuple2<K,V>> predicate)	Returns a new traversable consisting of all elements which satisfy the given predicate.
LinkedHashMap<K,V>	filterKeys(Predicate<? super K> predicate)	Returns a new Map consisting of all elements with keys which satisfy the given predicate.
LinkedHashMap<K,V>	filterValues(Predicate<? super V> predicate)	Returns a new Map consisting of all elements with values which satisfy the given predicate.
<K2, V2> LinkedHashMap<K2,V2>	flatMap(BiFunction<? super K,? super V,? extends Iterable<Tuple2<K2,V2>>> mapper)	FlatMaps this Map to a new Map with different component type.
Option<V>	get(K key)	Returns the Some of value to which the specified key is mapped, or None if this map contains no mapping for the key.
V	getOrElse(K key, V defaultValue)	Returns the value associated with a key, or a default value if the key is not contained in the map.
<C> Map<C,LinkedHashMap<K,V>>	groupBy(Function<? super Tuple2<K,V>,? extends C> classifier)	Groups this elements by classifying the elements.
Iterator<LinkedHashMap<K,V>>	grouped(int size)	Groups this Traversable into fixed size blocks.
int	hashCode()	Returns the hash code of this collection.
Tuple2<K,V>	head()	Returns the first element of a non-empty Traversable.
LinkedHashMap<K,V>	init()	Dual of Traversable.tail(), returning all elements except the last.
Option<LinkedHashMap<K,V>>	initOption()	Dual of Traversable.tailOption(), returning all elements except the last as Option.
boolean	isAsync()	An LinkedHashMap's value is computed synchronously.
boolean	isEmpty()	Checks if this Traversable is empty.
boolean	isLazy()	An LinkedHashMap's value is computed eagerly.
boolean	isSequential()	Checks if the elements of this Traversable appear in encounter order.
Iterator<Tuple2<K,V>>	iterator()	An iterator by means of head() and tail().
Set<K>	keySet()	Returns the keys contained in this map.
Tuple2<K,V>	last()	Dual of Traversable.head(), returning the last element.
<K2, V2> LinkedHashMap<K2,V2>	map(BiFunction<? super K,? super V,Tuple2<K2,V2>> mapper)	Maps the entries of this Map to form a new Map.
<K2> LinkedHashMap<K2,V>	mapKeys(Function<? super K,? extends K2> keyMapper)	Maps the keys of this Map while preserving the corresponding values.
<K2> LinkedHashMap<K2,V>	mapKeys(Function<? super K,? extends K2> keyMapper, BiFunction<? super V,? super V,? extends V> valueMerge)	Maps the keys of this Map while preserving the corresponding values and applying a value merge function on collisions.
<W> LinkedHashMap<K,W>	mapValues(Function<? super V,? extends W> mapper)	Maps the values of this Map while preserving the corresponding keys.
LinkedHashMap<K,V>	merge(Map<? extends K,? extends V> that)	Creates a new map which by merging the entries of this map and that map.
<U extends V> LinkedHashMap<K,V>	merge(Map<? extends K,U> that, BiFunction<? super V,? super U,? extends V> collisionResolution)	Creates a new map which by merging the entries of this map and that map.
static <K, V> LinkedHashMap<K,V>	narrow(LinkedHashMap<? extends K,? extends V> linkedHashMap)	Narrows a widened LinkedHashMap<? extends K, ? extends V> to LinkedHashMap<K, V> by performing a type-safe cast.
static <K, V> LinkedHashMap<K,V>	of(Tuple2<? extends K,? extends V> entry)	Returns a singleton LinkedHashMap, i.e. a LinkedHashMap of one element.
static <K, V> LinkedHashMap<K,V>	of(K key, V value)	Returns a singleton LinkedHashMap, i.e. a LinkedHashMap of one element.
static <K, V> LinkedHashMap<K,V>	of(K k1, V v1, K k2, V v2)	Creates a LinkedHashMap of the given list of key-value pairs.
static <K, V> LinkedHashMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3)	Creates a LinkedHashMap of the given list of key-value pairs.
static <K, V> LinkedHashMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4)	Creates a LinkedHashMap of the given list of key-value pairs.
static <K, V> LinkedHashMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5)	Creates a LinkedHashMap of the given list of key-value pairs.
static <K, V> LinkedHashMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5, K k6, V v6)	Creates a LinkedHashMap of the given list of key-value pairs.
static <K, V> LinkedHashMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5, K k6, V v6, K k7, V v7)	Creates a LinkedHashMap of the given list of key-value pairs.
static <K, V> LinkedHashMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5, K k6, V v6, K k7, V v7, K k8, V v8)	Creates a LinkedHashMap of the given list of key-value pairs.
static <K, V> LinkedHashMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5, K k6, V v6, K k7, V v7, K k8, V v8, K k9, V v9)	Creates a LinkedHashMap of the given list of key-value pairs.
static <K, V> LinkedHashMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5, K k6, V v6, K k7, V v7, K k8, V v8, K k9, V v9, K k10, V v10)	Creates a LinkedHashMap of the given list of key-value pairs.
static <K, V> LinkedHashMap<K,V>	ofAll(Map<? extends K,? extends V> map)	Returns a LinkedHashMap, from a source java.util.Map.
static <T, K, V> LinkedHashMap<K,V>	ofAll(Stream<? extends T> stream, Function<? super T,? extends K> keyMapper, Function<? super T,? extends V> valueMapper)	Returns a LinkedHashMap, from entries mapped from stream.
static <T, K, V> LinkedHashMap<K,V>	ofAll(Stream<? extends T> stream, Function<? super T,Tuple2<? extends K,? extends V>> entryMapper)	Returns a LinkedHashMap, from entries mapped from stream.
static <K, V> LinkedHashMap<K,V>	ofEntries(Tuple2<? extends K,? extends V>... entries)	Creates a LinkedHashMap of the given entries.
static <K, V> LinkedHashMap<K,V>	ofEntries(Iterable<? extends Tuple2<? extends K,? extends V>> entries)	Creates a LinkedHashMap of the given entries.
static <K, V> LinkedHashMap<K,V>	ofEntries(Map.Entry<? extends K,? extends V>... entries)	Creates a LinkedHashMap of the given entries.
LinkedHashMap<K,V>	orElse(Iterable<? extends Tuple2<K,V>> other)	Returns this Traversable if it is nonempty, otherwise return the alternative.
LinkedHashMap<K,V>	orElse(Supplier<? extends Iterable<? extends Tuple2<K,V>>> supplier)	Returns this Traversable if it is nonempty, otherwise return the result of evaluating supplier.
Tuple2<LinkedHashMap<K,V>,LinkedHashMap<K,V>>	partition(Predicate<? super Tuple2<K,V>> predicate)	Creates a partition of this Traversable by splitting this elements in two in distinct traversables according to a predicate.
LinkedHashMap<K,V>	peek(Consumer<? super Tuple2<K,V>> action)	Performs the given action on the first element if this is an eager implementation.
LinkedHashMap<K,V>	put(Tuple2<? extends K,? extends V> entry)	Convenience method for put(entry._1, entry._2).
<U extends V> LinkedHashMap<K,V>	put(Tuple2<? extends K,U> entry, BiFunction<? super V,? super U,? extends V> merge)	Convenience method for put(entry._1, entry._2, merge).
<U extends V> LinkedHashMap<K,V>	put(K key, U value, BiFunction<? super V,? super U,? extends V> merge)	Associates the specified value with the specified key in this map.
LinkedHashMap<K,V>	put(K key, V value)	Associates the specified value with the specified key in this map.
LinkedHashMap<K,V>	reject(BiPredicate<? super K,? super V> predicate)	Returns a new Map consisting of all elements which do not satisfy the given predicate.
LinkedHashMap<K,V>	reject(Predicate<? super Tuple2<K,V>> predicate)	Returns a new traversable consisting of all elements which do not satisfy the given predicate.
LinkedHashMap<K,V>	rejectKeys(Predicate<? super K> predicate)	Returns a new Map consisting of all elements with keys which do not satisfy the given predicate.
LinkedHashMap<K,V>	rejectValues(Predicate<? super V> predicate)	Returns a new Map consisting of all elements with values which do not satisfy the given predicate.
LinkedHashMap<K,V>	remove(K key)	Removes the mapping for a key from this map if it is present.
LinkedHashMap<K,V>	removeAll(Iterable<? extends K> keys)	Removes the mapping for a key from this map if it is present.
LinkedHashMap<K,V>	removeAll(BiPredicate<? super K,? super V> predicate)	Deprecated.
LinkedHashMap<K,V>	removeKeys(Predicate<? super K> predicate)	Deprecated.
LinkedHashMap<K,V>	removeValues(Predicate<? super V> predicate)	Deprecated.
LinkedHashMap<K,V>	replace(Tuple2<K,V> currentElement, Tuple2<K,V> newElement)	Replaces the first occurrence (if exists) of the given currentElement with newElement.
LinkedHashMap<K,V>	replace(K key, V oldValue, V newValue)	Replaces the entry for the specified key only if currently mapped to the specified value.
LinkedHashMap<K,V>	replaceAll(Tuple2<K,V> currentElement, Tuple2<K,V> newElement)	Replaces all occurrences of the given currentElement with newElement.
LinkedHashMap<K,V>	replaceAll(BiFunction<? super K,? super V,? extends V> function)	Replaces each entry's value with the result of invoking the given function on that entry until all entries have been processed or the function throws an exception.
LinkedHashMap<K,V>	replaceValue(K key, V value)	Replaces the entry for the specified key only if it is currently mapped to some value.
LinkedHashMap<K,V>	retainAll(Iterable<? extends Tuple2<K,V>> elements)	Keeps all occurrences of the given elements from this.
LinkedHashMap<K,V>	scan(Tuple2<K,V> zero, BiFunction<? super Tuple2<K,V>,? super Tuple2<K,V>,? extends Tuple2<K,V>> operation)	Computes a prefix scan of the elements of the collection.
int	size()	Computes the number of elements of this Traversable.
Iterator<LinkedHashMap<K,V>>	slideBy(Function<? super Tuple2<K,V>,?> classifier)	Slides a non-overlapping window of a variable size over this Traversable.
Iterator<LinkedHashMap<K,V>>	sliding(int size)	Slides a window of a specific size and step size 1 over this Traversable by calling Traversable.sliding(int, int).
Iterator<LinkedHashMap<K,V>>	sliding(int size, int step)	Slides a window of a specific size and step size over this Traversable.
Tuple2<LinkedHashMap<K,V>,LinkedHashMap<K,V>>	span(Predicate<? super Tuple2<K,V>> predicate)	Returns a tuple where the first element is the longest prefix of elements that satisfy the given predicate and the second element is the remainder.
String	stringPrefix()	Returns the name of this Value type, which is used by toString().
static <K, V> LinkedHashMap<K,V>	tabulate(int n, Function<? super Integer,? extends Tuple2<? extends K,? extends V>> f)	Returns a LinkedHashMap containing n values of a given Function f over a range of integer values from 0 to n - 1.
LinkedHashMap<K,V>	tail()	Drops the first element of a non-empty Traversable.
Option<LinkedHashMap<K,V>>	tailOption()	Drops the first element of a non-empty Traversable and returns an Option.
LinkedHashMap<K,V>	take(int n)	Takes the first n elements of this or all elements, if this length < n.
LinkedHashMap<K,V>	takeRight(int n)	Takes the last n elements of this or all elements, if this length < n.
LinkedHashMap<K,V>	takeUntil(Predicate<? super Tuple2<K,V>> predicate)	Takes elements until the predicate holds for the current element.
LinkedHashMap<K,V>	takeWhile(Predicate<? super Tuple2<K,V>> predicate)	Takes elements while the predicate holds for the current element.
LinkedHashMap<K,V>	toJavaMap()	Converts this Vavr Map to a java.util.Map while preserving characteristics like insertion order (LinkedHashMap) and sort order (SortedMap).
String	toString()	Clarifies that values have a proper toString() method implemented.
Seq<V>	values()	Returns a new Seq that contains the values of this Map.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface io.vavr.collection.Foldable

fold, reduce, reduceOption

Methods inherited from interface io.vavr.Function1

andThen, arity, compose, curried, isMemoized, memoized, partial, reversed, tupled

Methods inherited from interface io.vavr.collection.Map

apply, asPartialFunction, collect, contains, containsValue, flatMap, foldRight, forEach, hasDefiniteSize, isDefinedAt, isDistinct, isTraversableAgain, iterator, keysIterator, length, lift, map, scanLeft, scanRight, transform, unzip, unzip, unzip, unzip3, unzip3, valuesIterator, withDefault, withDefaultValue, zip, zipAll, zipWith, zipWithIndex, zipWithIndex

Methods inherited from interface io.vavr.collection.Traversable

arrangeBy, average, containsAll, count, existsUnique, find, findLast, foldLeft, forEachWithIndex, get, headOption, isOrdered, isSingleValued, lastOption, max, maxBy, maxBy, min, minBy, minBy, mkCharSeq, mkCharSeq, mkCharSeq, mkString, mkString, mkString, nonEmpty, product, reduceLeft, reduceLeftOption, reduceRight, reduceRightOption, single, singleOption, spliterator, sum

Methods inherited from interface io.vavr.Value

collect, collect, corresponds, eq, exists, forAll, forEach, getOrElse, getOrElse, getOrElseThrow, getOrElseTry, getOrNull, out, out, stderr, stdout, toArray, toCharSeq, toCompletableFuture, toEither, toEither, toInvalid, toInvalid, toJavaArray, toJavaArray, toJavaArray, toJavaCollection, toJavaList, toJavaList, toJavaMap, toJavaMap, toJavaMap, toJavaOptional, toJavaParallelStream, toJavaSet, toJavaSet, toJavaStream, toLeft, toLeft, toLinkedMap, toLinkedMap, toLinkedSet, toList, toMap, toMap, toOption, toPriorityQueue, toPriorityQueue, toQueue, toRight, toRight, toSet, toSortedMap, toSortedMap, toSortedMap, toSortedMap, toSortedSet, toSortedSet, toStream, toTree, toTree, toTry, toTry, toValid, toValid, toValidation, toValidation, toVector

Method Details

collector

public static <K,
V>
Collector<Tuple2<K,V>,ArrayList<Tuple2<K,V>>,LinkedHashMap<K,V>> collector()

Returns a Collector which may be used in conjunction with Stream.collect(java.util.stream.Collector) to obtain a LinkedHashMap.

Type Parameters:

K - The key type

V - The value type

Returns:

A LinkedHashMap Collector.

collector

public static <K,
V,
T extends V>
Collector<T,ArrayList<T>,LinkedHashMap<K,V>> collector(Function<? super T,? extends K> keyMapper)

Returns a Collector which may be used in conjunction with Stream.collect(java.util.stream.Collector) to obtain a LinkedHashMap.

Type Parameters:

K - The key type

V - The value type

T - Initial Stream elements type

Parameters:

keyMapper - The key mapper

Returns:

A LinkedHashMap Collector.

collector

public static <K,
V,
T>
Collector<T,ArrayList<T>,LinkedHashMap<K,V>> collector(Function<? super T,? extends K> keyMapper,
 Function<? super T,? extends V> valueMapper)

Returns a Collector which may be used in conjunction with Stream.collect(java.util.stream.Collector) to obtain a LinkedHashMap.

Type Parameters:

K - The key type

V - The value type

T - Initial Stream elements type

Parameters:

keyMapper - The key mapper

valueMapper - The value mapper

Returns:

A LinkedHashMap Collector.

empty

public static <K,
V> LinkedHashMap<K,V> empty()

narrow

public static <K,
V> LinkedHashMap<K,V> narrow(LinkedHashMap<? extends K,? extends V> linkedHashMap)

Narrows a widened LinkedHashMap<? extends K, ? extends V> to LinkedHashMap<K, V> by performing a type-safe cast. This is eligible because immutable/read-only collections are covariant.

Type Parameters:

K - Key type

V - Value type

Parameters:

linkedHashMap - A LinkedHashMap.

Returns:

the given linkedHashMap instance as narrowed type LinkedHashMap<K, V>.

of

public static <K,
V> LinkedHashMap<K,V> of(Tuple2<? extends K,? extends V> entry)

Returns a singleton LinkedHashMap, i.e. a LinkedHashMap of one element.

Type Parameters:

K - The key type

V - The value type

Parameters:

entry - A map entry.

Returns:

A new Map containing the given entry

ofAll

public static <K,
V> LinkedHashMap<K,V> ofAll(Map<? extends K,? extends V> map)

Returns a LinkedHashMap, from a source java.util.Map.

Type Parameters:

K - The key type

V - The value type

Parameters:

map - A map

Returns:

A new Map containing the given map

ofAll

public static <T,
K,
V> LinkedHashMap<K,V> ofAll(Stream<? extends T> stream,
 Function<? super T,Tuple2<? extends K,? extends V>> entryMapper)

Returns a LinkedHashMap, from entries mapped from stream.

Type Parameters:

T - The stream element type

K - The key type

V - The value type

Parameters:

stream - the source stream

entryMapper - the entry mapper

Returns:

A new Map

ofAll

public static <T,
K,
V> LinkedHashMap<K,V> ofAll(Stream<? extends T> stream,
 Function<? super T,? extends K> keyMapper,
 Function<? super T,? extends V> valueMapper)

Returns a LinkedHashMap, from entries mapped from stream.

Type Parameters:

T - The stream element type

K - The key type

V - The value type

Parameters:

stream - the source stream

keyMapper - the key mapper

valueMapper - the value mapper

Returns:

A new Map

of

public static <K,
V> LinkedHashMap<K,V> of(K key,
 V value)

Returns a singleton LinkedHashMap, i.e. a LinkedHashMap of one element.

Type Parameters:

K - The key type

V - The value type

Parameters:

key - A singleton map key.

value - A singleton map value.

Returns:

A new Map containing the given entry

of

public static <K,
V> LinkedHashMap<K,V> of(K k1,
 V v1,
 K k2,
 V v2)

Creates a LinkedHashMap of the given list of key-value pairs.

Type Parameters:

K - The key type

V - The value type

Parameters:

k1 - a key for the map

v1 - the value for k1

k2 - a key for the map

v2 - the value for k2

Returns:

A new Map containing the given entries

of

public static <K,
V> LinkedHashMap<K,V> of(K k1,
 V v1,
 K k2,
 V v2,
 K k3,
 V v3)

Creates a LinkedHashMap of the given list of key-value pairs.

Type Parameters:

K - The key type

V - The value type

Parameters:

k1 - a key for the map

v1 - the value for k1

k2 - a key for the map

v2 - the value for k2

k3 - a key for the map

v3 - the value for k3

Returns:

A new Map containing the given entries

of

public static <K,
V> LinkedHashMap<K,V> of(K k1,
 V v1,
 K k2,
 V v2,
 K k3,
 V v3,
 K k4,
 V v4)

Creates a LinkedHashMap of the given list of key-value pairs.

Type Parameters:

K - The key type

V - The value type

Parameters:

k1 - a key for the map

v1 - the value for k1

k2 - a key for the map

v2 - the value for k2

k3 - a key for the map

v3 - the value for k3

k4 - a key for the map

v4 - the value for k4

Returns:

A new Map containing the given entries

of

public static <K,
V> LinkedHashMap<K,V> of(K k1,
 V v1,
 K k2,
 V v2,
 K k3,
 V v3,
 K k4,
 V v4,
 K k5,
 V v5)

Creates a LinkedHashMap of the given list of key-value pairs.

Type Parameters:

K - The key type

V - The value type

Parameters:

k1 - a key for the map

v1 - the value for k1

k2 - a key for the map

v2 - the value for k2

k3 - a key for the map

v3 - the value for k3

k4 - a key for the map

v4 - the value for k4

k5 - a key for the map

v5 - the value for k5

Returns:

A new Map containing the given entries

of

public static <K,
V> LinkedHashMap<K,V> of(K k1,
 V v1,
 K k2,
 V v2,
 K k3,
 V v3,
 K k4,
 V v4,
 K k5,
 V v5,
 K k6,
 V v6)

Creates a LinkedHashMap of the given list of key-value pairs.

Type Parameters:

K - The key type

V - The value type

Parameters:

k1 - a key for the map

v1 - the value for k1

k2 - a key for the map

v2 - the value for k2

k3 - a key for the map

v3 - the value for k3

k4 - a key for the map

v4 - the value for k4

k5 - a key for the map

v5 - the value for k5

k6 - a key for the map

v6 - the value for k6

Returns:

A new Map containing the given entries

of

public static <K,
V> LinkedHashMap<K,V> of(K k1,
 V v1,
 K k2,
 V v2,
 K k3,
 V v3,
 K k4,
 V v4,
 K k5,
 V v5,
 K k6,
 V v6,
 K k7,
 V v7)

Creates a LinkedHashMap of the given list of key-value pairs.

Type Parameters:

K - The key type

V - The value type

Parameters:

k1 - a key for the map

v1 - the value for k1

k2 - a key for the map

v2 - the value for k2

k3 - a key for the map

v3 - the value for k3

k4 - a key for the map

v4 - the value for k4

k5 - a key for the map

v5 - the value for k5

k6 - a key for the map

v6 - the value for k6

k7 - a key for the map

v7 - the value for k7

Returns:

A new Map containing the given entries

of

public static <K,
V> LinkedHashMap<K,V> of(K k1,
 V v1,
 K k2,
 V v2,
 K k3,
 V v3,
 K k4,
 V v4,
 K k5,
 V v5,
 K k6,
 V v6,
 K k7,
 V v7,
 K k8,
 V v8)

Creates a LinkedHashMap of the given list of key-value pairs.

Type Parameters:

K - The key type

V - The value type

Parameters:

k1 - a key for the map

v1 - the value for k1

k2 - a key for the map

v2 - the value for k2

k3 - a key for the map

v3 - the value for k3

k4 - a key for the map

v4 - the value for k4

k5 - a key for the map

v5 - the value for k5

k6 - a key for the map

v6 - the value for k6

k7 - a key for the map

v7 - the value for k7

k8 - a key for the map

v8 - the value for k8

Returns:

A new Map containing the given entries

of

public static <K,
V> LinkedHashMap<K,V> of(K k1,
 V v1,
 K k2,
 V v2,
 K k3,
 V v3,
 K k4,
 V v4,
 K k5,
 V v5,
 K k6,
 V v6,
 K k7,
 V v7,
 K k8,
 V v8,
 K k9,
 V v9)

Creates a LinkedHashMap of the given list of key-value pairs.

Type Parameters:

K - The key type

V - The value type

Parameters:

k1 - a key for the map

v1 - the value for k1

k2 - a key for the map

v2 - the value for k2

k3 - a key for the map

v3 - the value for k3

k4 - a key for the map

v4 - the value for k4

k5 - a key for the map

v5 - the value for k5

k6 - a key for the map

v6 - the value for k6

k7 - a key for the map

v7 - the value for k7

k8 - a key for the map

v8 - the value for k8

k9 - a key for the map

v9 - the value for k9

Returns:

A new Map containing the given entries

of

public static <K,
V> LinkedHashMap<K,V> of(K k1,
 V v1,
 K k2,
 V v2,
 K k3,
 V v3,
 K k4,
 V v4,
 K k5,
 V v5,
 K k6,
 V v6,
 K k7,
 V v7,
 K k8,
 V v8,
 K k9,
 V v9,
 K k10,
 V v10)

Creates a LinkedHashMap of the given list of key-value pairs.

Type Parameters:

K - The key type

V - The value type

Parameters:

k1 - a key for the map

v1 - the value for k1

k2 - a key for the map

v2 - the value for k2

k3 - a key for the map

v3 - the value for k3

k4 - a key for the map

v4 - the value for k4

k5 - a key for the map

v5 - the value for k5

k6 - a key for the map

v6 - the value for k6

k7 - a key for the map

v7 - the value for k7

k8 - a key for the map

v8 - the value for k8

k9 - a key for the map

v9 - the value for k9

k10 - a key for the map

v10 - the value for k10

Returns:

A new Map containing the given entries

tabulate

public static <K,
V> LinkedHashMap<K,V> tabulate(int n,
 Function<? super Integer,? extends Tuple2<? extends K,? extends V>> f)

Returns a LinkedHashMap containing n values of a given Function f over a range of integer values from 0 to n - 1.

Type Parameters:

K - The key type

V - The value type

Parameters:

n - The number of elements in the LinkedHashMap

f - The Function computing element values

Returns:

A LinkedHashMap consisting of elements f(0),f(1), ..., f(n - 1)

Throws:

NullPointerException - if f is null

fill

public static <K,
V> LinkedHashMap<K,V> fill(int n,
 Supplier<? extends Tuple2<? extends K,? extends V>> s)

Returns a LinkedHashMap containing tuples returned by n calls to a given Supplier s.

Type Parameters:

K - The key type

V - The value type

Parameters:

n - The number of elements in the LinkedHashMap

s - The Supplier computing element values

Returns:

A LinkedHashMap of size n, where each element contains the result supplied by s.

Throws:

NullPointerException - if s is null

ofEntries

public static <K,
V> LinkedHashMap<K,V> ofEntries(Map.Entry<? extends K,? extends V>... entries)

Creates a LinkedHashMap of the given entries.

Type Parameters:

K - The key type

V - The value type

Parameters:

entries - Map entries

Returns:

A new Map containing the given entries

ofEntries

public static <K,
V> LinkedHashMap<K,V> ofEntries(Tuple2<? extends K,? extends V>... entries)

Creates a LinkedHashMap of the given entries.

Type Parameters:

K - The key type

V - The value type

Parameters:

entries - Map entries

Returns:

A new Map containing the given entries

ofEntries

public static <K,
V> LinkedHashMap<K,V> ofEntries(Iterable<? extends Tuple2<? extends K,? extends V>> entries)

Creates a LinkedHashMap of the given entries.

Type Parameters:

K - The key type

V - The value type

Parameters:

entries - Map entries

Returns:

A new Map containing the given entries

bimap

public <K2,
V2> LinkedHashMap<K2,V2> bimap(Function<? super K,? extends K2> keyMapper,
 Function<? super V,? extends V2> valueMapper)

Description copied from interface: Map

Maps this Map to a new Map with different component type by applying a function to its elements.

Specified by:

bimap in interface Map<K,V>

Type Parameters:

K2 - key's component type of the map result

V2 - value's component type of the map result

Parameters:

keyMapper - a Function that maps the keys of type K to keys of type K2

valueMapper - a Function that the values of type V to values of type V2

Returns:

a new Map

computeIfAbsent

public Tuple2<V,LinkedHashMap<K,V>> computeIfAbsent(K key,
 Function<? super K,? extends V> mappingFunction)

Description copied from interface: Map

If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map.

Specified by:

computeIfAbsent in interface Map<K,V>

Parameters:

key - key whose presence in this map is to be tested

mappingFunction - mapping function

Returns:

the Tuple2 of current or modified map and existing or computed value associated with the specified key

computeIfPresent

public Tuple2<Option<V>,LinkedHashMap<K,V>> computeIfPresent(K key,
 BiFunction<? super K,? super V,? extends V> remappingFunction)

Description copied from interface: Map

If the value for the specified key is present, attempts to compute a new mapping given the key and its current mapped value.

Specified by:

computeIfPresent in interface Map<K,V>

Parameters:

key - key whose presence in this map is to be tested

remappingFunction - remapping function

Returns:

the Tuple2 of current or modified map and the Some of the value associated with the specified key, or None if none

containsKey

public boolean containsKey(K key)

Description copied from interface: Map

Returns true if this map contains a mapping for the specified key.

Specified by:

containsKey in interface Map<K,V>

Parameters:

key - key whose presence in this map is to be tested

Returns:

true if this map contains a mapping for the specified key

distinct

public LinkedHashMap<K,V> distinct()

Description copied from interface: Traversable

Returns a new version of this which contains no duplicates. Elements are compared using equals.

Specified by:

distinct in interface Map<K,V>

Specified by:

distinct in interface Traversable<K>

Returns:

a new Traversable containing this elements without duplicates

distinctBy

public LinkedHashMap<K,V> distinctBy(Comparator<? super Tuple2<K,V>> comparator)

Description copied from interface: Traversable

Returns a new version of this which contains no duplicates. Elements are compared using the given comparator.

Specified by:

distinctBy in interface Map<K,V>

Specified by:

distinctBy in interface Traversable<K>

Parameters:

comparator - A comparator

Returns:

a new Traversable containing this elements without duplicates

distinctBy

public <U> LinkedHashMap<K,V> distinctBy(Function<? super Tuple2<K,V>,? extends U> keyExtractor)

Description copied from interface: Traversable

Returns a new version of this which contains no duplicates. Elements mapped to keys which are compared using equals.

The elements of the result are determined in the order of their occurrence - first match wins.

Specified by:

distinctBy in interface Map<K,V>

Specified by:

distinctBy in interface Traversable<K>

Type Parameters:

U - key type

Parameters:

keyExtractor - A key extractor

Returns:

a new Traversable containing this elements without duplicates

drop

public LinkedHashMap<K,V> drop(int n)

Description copied from interface: Traversable

Drops the first n elements of this or all elements, if this length < n.

Specified by:

drop in interface Map<K,V>

Specified by:

drop in interface Traversable<K>

Parameters:

n - The number of elements to drop.

Returns:

a new instance consisting of all elements of this except the first n ones, or else the empty instance, if this has less than n elements.

dropRight

public LinkedHashMap<K,V> dropRight(int n)

Description copied from interface: Traversable

Drops the last n elements of this or all elements, if this length < n.

Specified by:

dropRight in interface Map<K,V>

Specified by:

dropRight in interface Traversable<K>

Parameters:

n - The number of elements to drop.

Returns:

a new instance consisting of all elements of this except the last n ones, or else the empty instance, if this has less than n elements.

dropUntil

public LinkedHashMap<K,V> dropUntil(Predicate<? super Tuple2<K,V>> predicate)

Description copied from interface: Traversable

Drops elements until the predicate holds for the current element.

Specified by:

dropUntil in interface Map<K,V>

Specified by:

dropUntil in interface Traversable<K>

Parameters:

predicate - A condition tested subsequently for this elements.

Returns:

a new instance consisting of all elements starting from the first one which does satisfy the given predicate.

dropWhile

public LinkedHashMap<K,V> dropWhile(Predicate<? super Tuple2<K,V>> predicate)

Description copied from interface: Traversable

Drops elements while the predicate holds for the current element.

Note: This is essentially the same as dropUntil(predicate.negate()). It is intended to be used with method references, which cannot be negated directly.

Specified by:

dropWhile in interface Map<K,V>

Specified by:

dropWhile in interface Traversable<K>

Parameters:

predicate - A condition tested subsequently for this elements.

Returns:

a new instance consisting of all elements starting from the first one which does not satisfy the given predicate.

filter

public LinkedHashMap<K,V> filter(BiPredicate<? super K,? super V> predicate)

Description copied from interface: Map

Returns a new Map consisting of all elements which satisfy the given predicate.

Specified by:

filter in interface Map<K,V>

Parameters:

predicate - the predicate used to test elements

Returns:

a new Map

reject

public LinkedHashMap<K,V> reject(BiPredicate<? super K,? super V> predicate)

Description copied from interface: Map

Returns a new Map consisting of all elements which do not satisfy the given predicate.

Specified by:

reject in interface Map<K,V>

Parameters:

predicate - the predicate used to test elements

Returns:

a new Map

filter

public LinkedHashMap<K,V> filter(Predicate<? super Tuple2<K,V>> predicate)

Description copied from interface: Traversable

Returns a new traversable consisting of all elements which satisfy the given predicate.

Specified by:

filter in interface Map<K,V>

Specified by:

filter in interface Traversable<K>

Parameters:

predicate - A predicate

Returns:

a new traversable

reject

public LinkedHashMap<K,V> reject(Predicate<? super Tuple2<K,V>> predicate)

Description copied from interface: Traversable

Returns a new traversable consisting of all elements which do not satisfy the given predicate.

The default implementation is equivalent to

filter(predicate.negate()

Specified by:

reject in interface Map<K,V>

Specified by:

reject in interface Traversable<K>

Parameters:

predicate - A predicate

Returns:

a new traversable

filterKeys

public LinkedHashMap<K,V> filterKeys(Predicate<? super K> predicate)

Description copied from interface: Map

Returns a new Map consisting of all elements with keys which satisfy the given predicate.

Specified by:

filterKeys in interface Map<K,V>

Parameters:

predicate - the predicate used to test keys of elements

Returns:

a new Map

rejectKeys

public LinkedHashMap<K,V> rejectKeys(Predicate<? super K> predicate)

Description copied from interface: Map

Returns a new Map consisting of all elements with keys which do not satisfy the given predicate.

Specified by:

rejectKeys in interface Map<K,V>

Parameters:

predicate - the predicate used to test keys of elements

Returns:

a new Map

filterValues

public LinkedHashMap<K,V> filterValues(Predicate<? super V> predicate)

Description copied from interface: Map

Returns a new Map consisting of all elements with values which satisfy the given predicate.

Specified by:

filterValues in interface Map<K,V>

Parameters:

predicate - the predicate used to test values of elements

Returns:

a new Map

rejectValues

public LinkedHashMap<K,V> rejectValues(Predicate<? super V> predicate)

Description copied from interface: Map

Returns a new Map consisting of all elements with values which do not satisfy the given predicate.

Specified by:

rejectValues in interface Map<K,V>

Parameters:

predicate - the predicate used to test values of elements

Returns:

a new Map

flatMap

public <K2,
V2> LinkedHashMap<K2,V2> flatMap(BiFunction<? super K,? super V,? extends Iterable<Tuple2<K2,V2>>> mapper)

Description copied from interface: Map

FlatMaps this Map to a new Map with different component type.

Specified by:

flatMap in interface Map<K,V>

Type Parameters:

K2 - key's component type of the mapped Map

V2 - value's component type of the mapped Map

Parameters:

mapper - A mapper

Returns:

A new Map.

get

public Option<V> get(K key)

Description copied from interface: Map

Returns the Some of value to which the specified key is mapped, or None if this map contains no mapping for the key.

Specified by:

get in interface Map<K,V>

Parameters:

key - the key whose associated value is to be returned

Returns:

the Some of value to which the specified key is mapped, or None if this map contains no mapping for the key

getOrElse

public V getOrElse(K key,
 V defaultValue)

Description copied from interface: Map

Returns the value associated with a key, or a default value if the key is not contained in the map.

Specified by:

getOrElse in interface Map<K,V>

Parameters:

key - the key

defaultValue - a default value

Returns:

the value associated with key if it exists, otherwise the default value.

groupBy

public <C> Map<C,LinkedHashMap<K,V>> groupBy(Function<? super Tuple2<K,V>,? extends C> classifier)

Description copied from interface: Traversable

Groups this elements by classifying the elements.

Specified by:

groupBy in interface Map<K,V>

Specified by:

groupBy in interface Traversable<K>

Type Parameters:

C - classified class type

Parameters:

classifier - A function which classifies elements into classes

Returns:

A Map containing the grouped elements

See Also:

• Traversable.arrangeBy(Function)

grouped

public Iterator<LinkedHashMap<K,V>> grouped(int size)

Description copied from interface: Traversable

Groups this Traversable into fixed size blocks.

Let length be the length of this Iterable. Then grouped is defined as follows:

• If this.isEmpty(), the resulting Iterator is empty.
• If size <= length, the resulting Iterator will contain length / size blocks of size size and maybe a non-empty block of size length % size, if there are remaining elements.
• If size > length, the resulting Iterator will contain one block of size length.

Examples:

 
 [].grouped(1) = []
 [].grouped(0) throws
 [].grouped(-1) throws
 [1,2,3,4].grouped(2) = [[1,2],[3,4]]
 [1,2,3,4,5].grouped(2) = [[1,2],[3,4],[5]]
 [1,2,3,4].grouped(5) = [[1,2,3,4]]
 
 

Please note that grouped(int) is a special case of Traversable.sliding(int, int), i.e. grouped(size) is the same as sliding(size, size).

Specified by:

grouped in interface Map<K,V>

Specified by:

grouped in interface Traversable<K>

Parameters:

size - a positive block size

Returns:

A new Iterator of grouped blocks of the given size

head

public Tuple2<K,V> head()

Description copied from interface: Traversable

Returns the first element of a non-empty Traversable.

Specified by:

head in interface Traversable<K>

Returns:

The first element of this Traversable.

init

public LinkedHashMap<K,V> init()

Description copied from interface: Traversable

Dual of Traversable.tail(), returning all elements except the last.

Specified by:

init in interface Map<K,V>

Specified by:

init in interface Traversable<K>

Returns:

a new instance containing all elements except the last.

initOption

public Option<LinkedHashMap<K,V>> initOption()

Description copied from interface: Traversable

Dual of Traversable.tailOption(), returning all elements except the last as Option.

Specified by:

initOption in interface Map<K,V>

Specified by:

initOption in interface Traversable<K>

Returns:

Some(traversable) or None if this is empty.

isAsync

public boolean isAsync()

An LinkedHashMap's value is computed synchronously.

Specified by:

isAsync in interface Value<K>

Returns:

false

isEmpty

public boolean isEmpty()

Description copied from interface: Traversable

Checks if this Traversable is empty.

Specified by:

isEmpty in interface Traversable<K>

Specified by:

isEmpty in interface Value<K>

Returns:

true, if this Traversable contains no elements, false otherwise.

isLazy

public boolean isLazy()

An LinkedHashMap's value is computed eagerly.

Specified by:

isLazy in interface Value<K>

Returns:

false

isSequential

public boolean isSequential()

Description copied from interface: Traversable

Checks if the elements of this Traversable appear in encounter order.

Specified by:

isSequential in interface Traversable<K>

Returns:

true, if the insertion order of elements is preserved, false otherwise.

iterator

public Iterator<Tuple2<K,V>> iterator()

Description copied from interface: Traversable

An iterator by means of head() and tail(). Subclasses may want to override this method.

Specified by:

iterator in interface Iterable<K>

Specified by:

iterator in interface Map<K,V>

Specified by:

iterator in interface Traversable<K>

Specified by:

iterator in interface Value<K>

Returns:

A new Iterator of this Traversable elements.

keySet

public Set<K> keySet()

Description copied from interface: Map

Returns the keys contained in this map.

Specified by:

keySet in interface Map<K,V>

Returns:

Set of the keys contained in this map.

last

public Tuple2<K,V> last()

Description copied from interface: Traversable

Dual of Traversable.head(), returning the last element.

Specified by:

last in interface Traversable<K>

Returns:

the last element.

map

public <K2,
V2> LinkedHashMap<K2,V2> map(BiFunction<? super K,? super V,Tuple2<K2,V2>> mapper)

Description copied from interface: Map

Maps the entries of this Map to form a new Map.

Specified by:

map in interface Map<K,V>

Type Parameters:

K2 - key's component type of the map result

V2 - value's component type of the map result

Parameters:

mapper - a Function that maps entries of type (K, V) to entries of type (K2, V2)

Returns:

a new Map

mapKeys

public <K2> LinkedHashMap<K2,V> mapKeys(Function<? super K,? extends K2> keyMapper)

Description copied from interface: Map

Maps the keys of this Map while preserving the corresponding values.

The size of the result map may be smaller if keyMapper maps two or more distinct keys to the same new key. In this case the value at the latest of the original keys is retained. Order of keys is predictable in TreeMap (by comparator) and LinkedHashMap (insertion-order) and not predictable in HashMap.

Specified by:

mapKeys in interface Map<K,V>

Type Parameters:

K2 - the new key type

Parameters:

keyMapper - a Function that maps keys of type V to keys of type V2

Returns:

a new Map

mapKeys

public <K2> LinkedHashMap<K2,V> mapKeys(Function<? super K,? extends K2> keyMapper,
 BiFunction<? super V,? super V,? extends V> valueMerge)

Description copied from interface: Map

Maps the keys of this Map while preserving the corresponding values and applying a value merge function on collisions.

The size of the result map may be smaller if keyMapper maps two or more distinct keys to the same new key. In this case the associated values will be combined using valueMerge.

Specified by:

mapKeys in interface Map<K,V>

Type Parameters:

K2 - the new key type

Parameters:

keyMapper - a Function that maps keys of type V to keys of type V2

valueMerge - a BiFunction that merges values

Returns:

a new Map

mapValues

public <W> LinkedHashMap<K,W> mapValues(Function<? super V,? extends W> mapper)

Description copied from interface: Map

Maps the values of this Map while preserving the corresponding keys.

Specified by:

mapValues in interface Map<K,V>

Type Parameters:

W - the new value type

Parameters:

mapper - a Function that maps values of type V to values of type V2

Returns:

a new Map

merge

public LinkedHashMap<K,V> merge(Map<? extends K,? extends V> that)

Description copied from interface: Map

Creates a new map which by merging the entries of this map and that map.

If collisions occur, the value of this map is taken.

Specified by:

merge in interface Map<K,V>

Parameters:

that - the other map

Returns:

A merged map

merge

public <U extends V> LinkedHashMap<K,V> merge(Map<? extends K,U> that,
 BiFunction<? super V,? super U,? extends V> collisionResolution)

Description copied from interface: Map

Creates a new map which by merging the entries of this map and that map.

Uses the specified collision resolution function if two keys are the same. The collision resolution function will always take the first argument from this map and the second from that map.

Specified by:

merge in interface Map<K,V>

Type Parameters:

U - value type of that Map

Parameters:

that - the other map

collisionResolution - the collision resolution function

Returns:

A merged map

orElse

public LinkedHashMap<K,V> orElse(Iterable<? extends Tuple2<K,V>> other)

Description copied from interface: Traversable

Returns this Traversable if it is nonempty, otherwise return the alternative.

Specified by:

orElse in interface Map<K,V>

Specified by:

orElse in interface Traversable<K>

Parameters:

other - An alternative Traversable

Returns:

this Traversable if it is nonempty, otherwise return the alternative.

orElse

public LinkedHashMap<K,V> orElse(Supplier<? extends Iterable<? extends Tuple2<K,V>>> supplier)

Description copied from interface: Traversable

Returns this Traversable if it is nonempty, otherwise return the result of evaluating supplier.

Specified by:

orElse in interface Map<K,V>

Specified by:

orElse in interface Traversable<K>

Parameters:

supplier - An alternative Traversable supplier

Returns:

this Traversable if it is nonempty, otherwise return the result of evaluating supplier.

partition

public Tuple2<LinkedHashMap<K,V>,LinkedHashMap<K,V>> partition(Predicate<? super Tuple2<K,V>> predicate)

Description copied from interface: Traversable

Creates a partition of this Traversable by splitting this elements in two in distinct traversables according to a predicate.

Specified by:

partition in interface Map<K,V>

Specified by:

partition in interface Traversable<K>

Parameters:

predicate - A predicate which classifies an element if it is in the first or the second traversable.

Returns:

A disjoint union of two traversables. The first Traversable contains all elements that satisfy the given predicate, the second Traversable contains all elements that don't. The original order of elements is preserved.

peek

public LinkedHashMap<K,V> peek(Consumer<? super Tuple2<K,V>> action)

Description copied from interface: Value

Performs the given action on the first element if this is an eager implementation. Performs the given action on all elements (the first immediately, successive deferred), if this is a lazy implementation.

Specified by:

peek in interface Map<K,V>

Specified by:

peek in interface Traversable<K>

Specified by:

peek in interface Value<K>

Parameters:

action - The action that will be performed on the element(s).

Returns:

this instance

put

public <U extends V> LinkedHashMap<K,V> put(K key,
 U value,
 BiFunction<? super V,? super U,? extends V> merge)

Description copied from interface: Map

Associates the specified value with the specified key in this map. If the map previously contained a mapping for the key, the merge function is used to combine the previous value to the value to be inserted, and the result of that call is inserted in the map.

Specified by:

put in interface Map<K,V>

Type Parameters:

U - the value type

Parameters:

key - key with which the specified value is to be associated

value - value to be associated with the specified key

merge - function taking the old and new values and merging them.

Returns:

A new Map containing these elements and that entry.

put

public LinkedHashMap<K,V> put(K key,
 V value)

Associates the specified value with the specified key in this map. If the map previously contained a mapping for the key, the old value is replaced by the specified value.

Note that this method has a worst-case linear complexity.

Specified by:

put in interface Map<K,V>

Parameters:

key - key with which the specified value is to be associated

value - value to be associated with the specified key

Returns:

A new Map containing these elements and that entry.

put

public LinkedHashMap<K,V> put(Tuple2<? extends K,? extends V> entry)

Description copied from interface: Map

Convenience method for put(entry._1, entry._2).

Specified by:

put in interface Map<K,V>

Parameters:

entry - A Tuple2 containing the key and value

Returns:

A new Map containing these elements and that entry.

put

public <U extends V> LinkedHashMap<K,V> put(Tuple2<? extends K,U> entry,
 BiFunction<? super V,? super U,? extends V> merge)

Description copied from interface: Map

Convenience method for put(entry._1, entry._2, merge).

Specified by:

put in interface Map<K,V>

Type Parameters:

U - the value type

Parameters:

entry - A Tuple2 containing the key and value

merge - function taking the old and new values and merging them.

Returns:

A new Map containing these elements and that entry.

remove

public LinkedHashMap<K,V> remove(K key)

Description copied from interface: Map

Removes the mapping for a key from this map if it is present.

Specified by:

remove in interface Map<K,V>

Parameters:

key - key whose mapping is to be removed from the map

Returns:

A new Map containing these elements without the entry specified by that key.

removeAll

@Deprecated
public LinkedHashMap<K,V> removeAll(BiPredicate<? super K,? super V> predicate)

Deprecated.

Description copied from interface: Map

Returns a new Map consisting of all elements which do not satisfy the given predicate.

Specified by:

removeAll in interface Map<K,V>

Parameters:

predicate - the predicate used to test elements

Returns:

a new Map

removeAll

public LinkedHashMap<K,V> removeAll(Iterable<? extends K> keys)

Description copied from interface: Map

Removes the mapping for a key from this map if it is present.

Specified by:

removeAll in interface Map<K,V>

Parameters:

keys - keys are to be removed from the map

Returns:

A new Map containing these elements without the entries specified by that keys.

removeKeys

@Deprecated
public LinkedHashMap<K,V> removeKeys(Predicate<? super K> predicate)

Deprecated.

Description copied from interface: Map

Returns a new Map consisting of all elements with keys which do not satisfy the given predicate.

Specified by:

removeKeys in interface Map<K,V>

Parameters:

predicate - the predicate used to test keys of elements

Returns:

a new Map

removeValues

@Deprecated
public LinkedHashMap<K,V> removeValues(Predicate<? super V> predicate)

Deprecated.

Description copied from interface: Map

Returns a new Map consisting of all elements with values which do not satisfy the given predicate.

Specified by:

removeValues in interface Map<K,V>

Parameters:

predicate - the predicate used to test values of elements

Returns:

a new Map

replace

public LinkedHashMap<K,V> replace(Tuple2<K,V> currentElement,
 Tuple2<K,V> newElement)

Description copied from interface: Traversable

Replaces the first occurrence (if exists) of the given currentElement with newElement.

Specified by:

replace in interface Map<K,V>

Specified by:

replace in interface Traversable<K>

Parameters:

currentElement - An element to be substituted.

newElement - A replacement for currentElement.

Returns:

a Traversable containing all elements of this where the first occurrence of currentElement is replaced with newElement.

replaceAll

public LinkedHashMap<K,V> replaceAll(Tuple2<K,V> currentElement,
 Tuple2<K,V> newElement)

Description copied from interface: Traversable

Replaces all occurrences of the given currentElement with newElement.

Specified by:

replaceAll in interface Map<K,V>

Specified by:

replaceAll in interface Traversable<K>

Parameters:

currentElement - An element to be substituted.

newElement - A replacement for currentElement.

Returns:

a Traversable containing all elements of this where all occurrences of currentElement are replaced with newElement.

replaceValue

public LinkedHashMap<K,V> replaceValue(K key,
 V value)

Description copied from interface: Map

Replaces the entry for the specified key only if it is currently mapped to some value.

Specified by:

replaceValue in interface Map<K,V>

Parameters:

key - the key of the element to be substituted.

value - the new value to be associated with the key

Returns:

a new map containing key mapped to value if key was contained before. The old map otherwise.

replace

public LinkedHashMap<K,V> replace(K key,
 V oldValue,
 V newValue)

Description copied from interface: Map

Replaces the entry for the specified key only if currently mapped to the specified value.

Specified by:

replace in interface Map<K,V>

Parameters:

key - the key of the element to be substituted.

oldValue - the expected current value that the key is currently mapped to

newValue - the new value to be associated with the key

Returns:

a new map containing key mapped to newValue if key was contained before and oldValue matched. The old map otherwise.

replaceAll

public LinkedHashMap<K,V> replaceAll(BiFunction<? super K,? super V,? extends V> function)

Description copied from interface: Map

Replaces each entry's value with the result of invoking the given function on that entry until all entries have been processed or the function throws an exception.

Specified by:

replaceAll in interface Map<K,V>

Parameters:

function - function transforming key and current value to a new value

Returns:

a new map with the same keySet but transformed values.

retainAll

public LinkedHashMap<K,V> retainAll(Iterable<? extends Tuple2<K,V>> elements)

Description copied from interface: Traversable

Keeps all occurrences of the given elements from this.

Specified by:

retainAll in interface Map<K,V>

Specified by:

retainAll in interface Traversable<K>

Parameters:

elements - Elements to be kept.

Returns:

a Traversable containing all occurrences of the given elements.

scan

public LinkedHashMap<K,V> scan(Tuple2<K,V> zero,
 BiFunction<? super Tuple2<K,V>,? super Tuple2<K,V>,? extends Tuple2<K,V>> operation)

Description copied from interface: Traversable

Computes a prefix scan of the elements of the collection. Note: The neutral element z may be applied more than once.

Specified by:

scan in interface Map<K,V>

Specified by:

scan in interface Traversable<K>

Parameters:

zero - neutral element for the operator op

operation - the associative operator for the scan

Returns:

a new traversable collection containing the prefix scan of the elements in this traversable collection

size

public int size()

Description copied from interface: Traversable

Computes the number of elements of this Traversable.

Same as Traversable.length().

Specified by:

size in interface Map<K,V>

Specified by:

size in interface Traversable<K>

Returns:

the number of elements

slideBy

public Iterator<LinkedHashMap<K,V>> slideBy(Function<? super Tuple2<K,V>,?> classifier)

Description copied from interface: Traversable

Slides a non-overlapping window of a variable size over this Traversable.

Each window contains elements with the same class, as determined by classifier. Two consecutive values in this Traversable will be in the same window only if classifier returns equal values for them. Otherwise, the values will constitute the last element of the previous window and the first element of the next window.

Examples:

 [].slideBy(Function.identity()) = []
 [1,2,3,4,4,5].slideBy(Function.identity()) = [[1],[2],[3],[4,4],[5]]
 [1,2,3,10,12,5,7,20,29].slideBy(x -> x/10) = [[1,2,3],[10,12],[5,7],[20,29]]
 

Specified by:

slideBy in interface Map<K,V>

Specified by:

slideBy in interface Traversable<K>

Parameters:

classifier - A function which classifies elements into classes

Returns:

A new Iterator of windows of the grouped elements

sliding

public Iterator<LinkedHashMap<K,V>> sliding(int size)

Description copied from interface: Traversable

Slides a window of a specific size and step size 1 over this Traversable by calling Traversable.sliding(int, int).

Specified by:

sliding in interface Map<K,V>

Specified by:

sliding in interface Traversable<K>

Parameters:

size - a positive window size

Returns:

a new Iterator of windows of a specific size using step size 1

sliding

public Iterator<LinkedHashMap<K,V>> sliding(int size,
 int step)

Description copied from interface: Traversable

Slides a window of a specific size and step size over this Traversable.

Examples:

 
 [].sliding(1,1) = []
 [1,2,3,4,5].sliding(2,3) = [[1,2],[4,5]]
 [1,2,3,4,5].sliding(2,4) = [[1,2],[5]]
 [1,2,3,4,5].sliding(2,5) = [[1,2]]
 [1,2,3,4].sliding(5,3) = [[1,2,3,4],[4]]
 
 

Specified by:

sliding in interface Map<K,V>

Specified by:

sliding in interface Traversable<K>

Parameters:

size - a positive window size

step - a positive step size

Returns:

a new Iterator of windows of a specific size using a specific step size

span

public Tuple2<LinkedHashMap<K,V>,LinkedHashMap<K,V>> span(Predicate<? super Tuple2<K,V>> predicate)

Description copied from interface: Traversable

Returns a tuple where the first element is the longest prefix of elements that satisfy the given predicate and the second element is the remainder.

Specified by:

span in interface Map<K,V>

Specified by:

span in interface Traversable<K>

Parameters:

predicate - A predicate.

Returns:

a Tuple containing the longest prefix of elements that satisfy p and the remainder.

tail

public LinkedHashMap<K,V> tail()

Description copied from interface: Traversable

Drops the first element of a non-empty Traversable.

Specified by:

tail in interface Map<K,V>

Specified by:

tail in interface Traversable<K>

Returns:

A new instance of Traversable containing all elements except the first.

tailOption

public Option<LinkedHashMap<K,V>> tailOption()

Description copied from interface: Traversable

Drops the first element of a non-empty Traversable and returns an Option.

Specified by:

tailOption in interface Map<K,V>

Specified by:

tailOption in interface Traversable<K>

Returns:

Some(traversable) or None if this is empty.

take

public LinkedHashMap<K,V> take(int n)

Description copied from interface: Traversable

Takes the first n elements of this or all elements, if this length < n.

The result is equivalent to sublist(0, max(0, min(length(), n))) but does not throw if n < 0 or n > length().

In the case of n < 0 the empty instance is returned, in the case of n > length() this is returned.

Specified by:

take in interface Map<K,V>

Specified by:

take in interface Traversable<K>

Parameters:

n - The number of elements to take.

Returns:

A new instance consisting of the first n elements of this or all elements, if this has less than n elements.

takeRight

public LinkedHashMap<K,V> takeRight(int n)

Description copied from interface: Traversable

Takes the last n elements of this or all elements, if this length < n.

The result is equivalent to sublist(max(0, min(length(), length() - n)), n), i.e. takeRight will not throw if n < 0 or n > length().

In the case of n < 0 the empty instance is returned, in the case of n > length() this is returned.

Specified by:

takeRight in interface Map<K,V>

Specified by:

takeRight in interface Traversable<K>

Parameters:

n - The number of elements to take.

Returns:

A new instance consisting of the last n elements of this or all elements, if this has less than n elements.

takeUntil

public LinkedHashMap<K,V> takeUntil(Predicate<? super Tuple2<K,V>> predicate)

Description copied from interface: Traversable

Takes elements until the predicate holds for the current element.

Note: This is essentially the same as takeWhile(predicate.negate()). It is intended to be used with method references, which cannot be negated directly.

Specified by:

takeUntil in interface Map<K,V>

Specified by:

takeUntil in interface Traversable<K>

Parameters:

predicate - A condition tested subsequently for this elements.

Returns:

a new instance consisting of all elements before the first one which does satisfy the given predicate.

takeWhile

public LinkedHashMap<K,V> takeWhile(Predicate<? super Tuple2<K,V>> predicate)

Description copied from interface: Traversable

Takes elements while the predicate holds for the current element.

Specified by:

takeWhile in interface Map<K,V>

Specified by:

takeWhile in interface Traversable<K>

Parameters:

predicate - A condition tested subsequently for the contained elements.

Returns:

a new instance consisting of all elements before the first one which does not satisfy the given predicate.

toJavaMap

public LinkedHashMap<K,V> toJavaMap()

Description copied from interface: Map

Converts this Vavr Map to a java.util.Map while preserving characteristics like insertion order (LinkedHashMap) and sort order (SortedMap).

Specified by:

toJavaMap in interface Map<K,V>

Returns:

a new java.util.Map instance

values

public Seq<V> values()

Description copied from interface: Map

Returns a new Seq that contains the values of this Map.

 // = Seq("a", "b", "c")
 HashMap.of(1, "a", 2, "b", 3, "c").values()
 

Specified by:

values in interface Map<K,V>

Returns:

a new Seq

equals

public boolean equals(Object o)

Description copied from interface: Traversable

In Vavr there are four basic classes of collections:

• Seq (sequential elements)
• Set (distinct elements)
• Map (indexed elements)
• Multimap (indexed collections)

Two collection instances of these classes are equal if and only if both collections

• belong to the same basic collection class (Seq, Set, Map or Multimap)
• contain the same elements
• have the same element order, if the collections are of type Seq

Two Map/Multimap elements, resp. entries, (key1, value1) and (key2, value2) are equal, if the keys are equal and the values are equal.

Notes:

• No collection instance equals null, e.g. Queue(1) not equals null.
• Nulls are allowed and handled as expected, e.g. List(null, 1) equals Stream(null, 1) and HashMap((null, 1)) equals LinkedHashMap((null, 1)).
• The element order is taken into account for Seq only. E.g. List(null, 1) not equals Stream(1, null) and HashMap((null, 1), ("a", null)) equals LinkedHashMap(("a", null), (null, 1)). The reason is, that we do not know which implementations we compare when having two instances of type Map, Multimap or Set (see Liskov Substitution Principle).
• Other collection classes are equal if their types are equal and their elements are equal (in iteration order).
• Iterator equality is defined to be object reference equality.

Specified by:

equals in interface Traversable<K>

Specified by:

equals in interface Value<K>

Overrides:

equals in class Object

Parameters:

o - an object, may be null

Returns:

true, if this collection equals the given object according to the rules described above, false otherwise.

hashCode

public int hashCode()

Description copied from interface: Traversable

Returns the hash code of this collection.
We distinguish between two types of hashes, those for collections with predictable iteration order (like Seq) and those with arbitrary iteration order (like Set, Map and Multimap).
In all cases the hash of an empty collection is defined to be 1.
Collections with predictable iteration order are hashed as follows:

 int hash = 1;
 for (T t : this) { hash = hash * 31 + Objects.hashCode(t); }
 

Collections with arbitrary iteration order are hashed in a way such that the hash of a fixed number of elements is independent of their iteration order.

 int hash = 1;
 for (T t : this) { hash += Objects.hashCode(t); }
 

Please note that the particular hashing algorithms may change in a future version of Vavr.
Generally, hash codes of collections aren't cached in Vavr (opposed to the size/length). Storing hash codes in order to reduce the time complexity would increase the memory footprint. Persistent collections are built upon tree structures, it allows us to implement efficient memory sharing. A drawback of tree structures is that they make it necessary to store collection attributes at each tree node (read: element).
The computation of the hash code is linear in time, i.e. O(n). If the hash code of a collection is re-calculated often, e.g. when using a List as HashMap key, we might want to cache the hash code. This can be achieved by simply using a wrapper class, which is not included in Vavr but could be implemented like this:

public final class Hashed<K> {

     private final K key;
     private final Lazy<Integer> hashCode;

     public Hashed(K key) {
         this.key = key;
         this.hashCode = Lazy.of(() -> Objects.hashCode(key));
     }

     public K key() {
         return key;
     }

     &#64;Override
     public boolean equals(Object o) {
         if (o == key) {
             return true;
         } else if (key != null && o instanceof Hashed) {
             final Hashed that = (Hashed) o;
             return key.equals(that.key);
         } else {
             return false;
         }
     }

     &#64;Override
     public int hashCode() {
         return hashCode.get();
     }

     &#64;Override
     public String toString() {
         return "Hashed(" + (key == null ? "null" : key.toString()) + ")";
     }
 }

Specified by:

hashCode in interface Traversable<K>

Specified by:

hashCode in interface Value<K>

Overrides:

hashCode in class Object

Returns:

The hash code of this collection

stringPrefix

public String stringPrefix()

Description copied from interface: Value

Returns the name of this Value type, which is used by toString().

Specified by:

stringPrefix in interface Value<K>

Returns:

This type name.

toString

public String toString()

Description copied from interface: Value

Clarifies that values have a proper toString() method implemented.

See Object.toString().

Specified by:

toString in interface Value<K>

Overrides:

toString in class Object

Returns:

A String representation of this object