A Map of objects that can be ordered relative to each other.

The map is based on a self-balancing binary tree. It allows most operations in amortized logarithmic time.

Keys of the map are compared using the compare function passed in the constructor, both for ordering and for equality. If the map contains only the key a, then map.containsKey(b) will return true if and only if compare(a, b) == 0, and the value of a == b is not even checked. If the compare function is omitted, the objects are assumed to be Comparable, and are compared using their Comparable.compareTo method. Non-comparable objects (including null) will not work as keys in that case.

To allow calling operator[], remove or containsKey with objects that are not supported by the compare function, an extra isValidKey predicate function can be supplied. This function is tested before using the compare function on an argument value that may not be a K value. If omitted, the isValidKey function defaults to testing if the value is a K.

Implements

Constructors

SplayTreeMap([int compare(K key1, K key2), bool isValidKey(potentialKey)])

SplayTreeMap.from(Map other, [int compare(K key1, K key2), bool isValidKey(potentialKey)])

Creates a SplayTreeMap that contains all key/value pairs of other.

factory
SplayTreeMap.fromIterable(Iterable iterable, {K key(element), V value(element), int compare(K key1, K key2), bool isValidKey(potentialKey)})

Creates a SplayTreeMap where the keys and values are computed from the iterable.

factory
SplayTreeMap.fromIterables(Iterable<K> keys, Iterable<V> values, [int compare(K key1, K key2), bool isValidKey(potentialKey)])

Creates a SplayTreeMap associating the given keys to values.

factory

Properties

hashCode → int

Get a hash code for this object.

read-only, inherited
isEmpty → bool

read-only
isNotEmpty → bool

read-only
keys → Iterable<K>

read-only
length → int

read-only
runtimeType → Type

A representation of the runtime type of the object.

read-only, inherited
values → Iterable<V>

read-only

Operators

operator ==(other) → bool

The equality operator.

inherited
operator [](Object key) → V

Returns the value for the given key or null if key is not in the map.

operator []=(K key, V value) → void

Associates the key with the given value.

Methods

addAll(Map<K, V> other) → void

Adds all key-value pairs of other to this map.

clear() → void

Removes all pairs from the map.

containsKey(Object key) → bool

Returns true if this map contains the given key.

containsValue(Object value) → bool

Returns true if this map contains the given value.

firstKey() → K

Get the first key in the map. Returns null if the map is empty.

firstKeyAfter(K key) → K

Get the first key in the map that is strictly larger than key. Returns null if no key was not found.

forEach(void f(K key, V value)) → void

Applies f to each key-value pair of the map.

lastKey() → K

Get the last key in the map. Returns null if the map is empty.

lastKeyBefore(K key) → K

Get the last key in the map that is strictly smaller than key. Returns null if no key was not found.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a non-existent method or property is accessed.

inherited
putIfAbsent(K key, V ifAbsent()) → V

Look up the value of key, or add a new value if it isn't there.

remove(Object key) → V

Removes key and its associated value, if present, from the map.

toString() → String

Returns a string representation of this object.