| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| part of dart.collection; |
| |
| /** |
| * A hash-table based implementation of [Map]. |
| * |
| * The keys of a `HashMap` must have consistent [Object.operator==] |
| * and [Object.hashCode] implementations. This means that the `==` operator |
| * must define a stable equivalence relation on the keys (reflexive, |
| * anti-symmetric, transitive, and consistent over time), and that `hashCode` |
| * must be the same for objects that are considered equal by `==`. |
| * |
| * The map allows `null` as a key. |
| */ |
| class HashMap<K, V> implements Map<K, V> { |
| external HashMap(); |
| |
| factory HashMap.from(Map<K, V> other) { |
| return new HashMap<K, V>()..addAll(other); |
| } |
| |
| external int get length; |
| external bool get isEmpty; |
| external bool get isNotEmpty; |
| |
| external Iterable<K> get keys; |
| external Iterable<V> get values; |
| |
| external bool containsKey(Object key); |
| external bool containsValue(Object value); |
| |
| external void addAll(Map<K, V> other); |
| |
| external V operator [](Object key); |
| external void operator []=(K key, V value); |
| |
| external V putIfAbsent(K key, V ifAbsent()); |
| |
| external V remove(Object key); |
| external void clear(); |
| |
| external void forEach(void action(K key, V value)); |
| |
| String toString() => Maps.mapToString(this); |
| } |