org.djutils.immutablecollections

Interface ImmutableSortedMap<K,V>

Type Parameters:

K - the key type of content of this Map

V - the value type of content of this Map

All Superinterfaces:

ImmutableMap<K,V>, Serializable

All Known Subinterfaces:

ImmutableNavigableMap<K,V>

All Known Implementing Classes:

ImmutableTreeMap

public interface ImmutableSortedMap<K,V>
extends ImmutableMap<K,V>

A SortedMap interface without the methods that can change it. The return values of subMap, tailMap and headMap are all ImmutableSortedMaps.

Copyright (c) 2016-2019 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See for project information https://djutils.org. The DJUTILS project is distributed under a three-clause BSD-style license, which can be found at https://djutils.org/docs/license.html.

Author:

Alexander Verbraeck, Peter Knoppers, Wouter Schakel

Nested Class Summary

Nested classes/interfaces inherited from interface org.djutils.immutablecollections.ImmutableMap

ImmutableMap.ImmutableEntry<K,V>

Method Summary

Modifier and Type	Method and Description
Comparator<? super K>	comparator() Returns the comparator used to order the keys in this immutable map, or null if this immutable map uses the natural ordering of its keys.
boolean	equals(Object obj) Force to redefine equals for the implementations of immutable collection classes.
K	firstKey() Returns the first (lowest) key currently in this immutable map.
int	hashCode() Force to redefine hashCode for the implementations of immutable collection classes.
ImmutableSortedMap<K,V>	headMap(K toKey) Returns a view of the portion of this immutable map whose keys are strictly less than toKey.
ImmutableSortedSet<K>	keySet() Return an ImmutableSortedSet view of the keys contained in this immutable map.
K	lastKey() Returns the last (highest) key currently in this immutable map.
ImmutableSortedMap<K,V>	subMap(K fromKey, K toKey) Returns a view of the portion of this immutable map whose keys range from fromKey, inclusive, to toKey, exclusive.
ImmutableSortedMap<K,V>	tailMap(K fromKey) Returns a view of the portion of this immutable map whose keys are greater than or equal to fromKey.
SortedMap<K,V>	toMap() Returns a modifiable copy of this immutable map.

Methods inherited from interface org.djutils.immutablecollections.ImmutableMap

containsKey, containsValue, entrySet, forEach, get, getOrDefault, isCopy, isEmpty, isWrap, size, values

Method Detail

toMap

SortedMap<K,V> toMap()

Returns a modifiable copy of this immutable map.

Specified by:

toMap in interface ImmutableMap<K,V>

Returns:

a modifiable copy of this immutable map.

comparator

Comparator<? super K> comparator()

Returns the comparator used to order the keys in this immutable map, or null if this immutable map uses the natural ordering of its keys.

Returns:

the comparator used to order the keys in this immutable map, or null if this immutable map uses the natural ordering of its keys

subMap

ImmutableSortedMap<K,V> subMap(K fromKey,
                               K toKey)

Returns a view of the portion of this immutable map whose keys range from fromKey, inclusive, to toKey, exclusive. (If fromKey and toKey are equal, the returned immutable map is empty.)

The result of this method is a new, immutable sorted map.

Parameters:

fromKey - K; low endpoint (inclusive) of the returned immutable map

toKey - K; high endpoint (exclusive) of the returned immutable map

Returns:

a new, immutable sorted map of the portion of this immutable map whose keys range from fromKey, inclusive, to toKey, exclusive

Throws:

ClassCastException - if fromKey and toKey cannot be compared to one another using this immutable map's comparator (or, if the immutable map has no comparator, using natural ordering). Implementations may, but are not required to, throw this exception if fromKey or toKey cannot be compared to keys currently in the immutable map.

NullPointerException - if fromKey or toKey is null and this immutable map does not permit null keys

IllegalArgumentException - if fromKey is greater than toKey; or if this immutable map itself has a restricted range, and fromKey or toKey lies outside the bounds of the range

headMap

ImmutableSortedMap<K,V> headMap(K toKey)

Returns a view of the portion of this immutable map whose keys are strictly less than toKey. The returned immutable map is backed by this immutable map, so changes in the returned immutable map are reflected in this immutable map, and vice-versa. The returned immutable map supports all optional immutable map operations that this immutable map supports.

The result of this method is a new, immutable sorted map.

Parameters:

toKey - K; high endpoint (exclusive) of the returned immutable map

Returns:

a view of the portion of this immutable map whose keys are strictly less than toKey

Throws:

ClassCastException - if toKey is not compatible with this immutable map's comparator (or, if the immutable map has no comparator, if toKey does not implement Comparable). Implementations may, but are not required to, throw this exception if toKey cannot be compared to keys currently in the immutable map.

NullPointerException - if toKey is null and this immutable map does not permit null keys

IllegalArgumentException - if this immutable map itself has a restricted range, and toKey lies outside the bounds of the range

tailMap

ImmutableSortedMap<K,V> tailMap(K fromKey)

Returns a view of the portion of this immutable map whose keys are greater than or equal to fromKey. The returned immutable map is backed by this immutable map, so changes in the returned immutable map are reflected in this immutable map, and vice-versa. The returned immutable map supports all optional immutable map operations that this immutable map supports.

The result of this method is a new, immutable sorted map.

Parameters:

fromKey - K; low endpoint (inclusive) of the returned immutable map

Returns:

a view of the portion of this immutable map whose keys are greater than or equal to fromKey

Throws:

ClassCastException - if fromKey is not compatible with this immutable map's comparator (or, if the immutable map has no comparator, if fromKey does not implement Comparable). Implementations may, but are not required to, throw this exception if fromKey cannot be compared to keys currently in the immutable map.

NullPointerException - if fromKey is null and this immutable map does not permit null keys

IllegalArgumentException - if this immutable map itself has a restricted range, and fromKey lies outside the bounds of the range

firstKey

K firstKey()

Returns the first (lowest) key currently in this immutable map.

Returns:

the first (lowest) key currently in this immutable map

Throws:

NoSuchElementException - if this immutable map is empty

lastKey

K lastKey()

Returns the last (highest) key currently in this immutable map.

Returns:

the last (highest) key currently in this immutable map

Throws:

NoSuchElementException - if this immutable map is empty

keySet

ImmutableSortedSet<K> keySet()

Return an ImmutableSortedSet view of the keys contained in this immutable map.

Specified by:

keySet in interface ImmutableMap<K,V>

Returns:

an ImmutableSortedSet view of the keys contained in this immutable map

equals

boolean equals(Object obj)

Force to redefine equals for the implementations of immutable collection classes.

Specified by:

equals in interface ImmutableMap<K,V>

Overrides:

equals in class Object

Parameters:

obj - Object; the object to compare this collection with

Returns:

whether the objects are equal

hashCode

int hashCode()

Force to redefine hashCode for the implementations of immutable collection classes.

Specified by:

hashCode in interface ImmutableMap<K,V>

Overrides:

hashCode in class Object

Returns:

the calculated hashCode