137 lines
2.4 KiB
JavaScript
137 lines
2.4 KiB
JavaScript
/**
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* Copyright 2017 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @template T
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* @template V
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*/
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class Multimap {
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constructor() {
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this._map = new Map();
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}
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/**
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* @param {T} key
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* @param {V} value
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*/
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set(key, value) {
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let set = this._map.get(key);
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if (!set) {
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set = new Set();
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this._map.set(key, set);
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}
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set.add(value);
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}
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/**
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* @param {T} key
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* @return {!Set<V>}
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*/
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get(key) {
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let result = this._map.get(key);
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if (!result)
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result = new Set();
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return result;
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}
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/**
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* @param {T} key
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* @return {boolean}
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*/
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has(key) {
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return this._map.has(key);
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}
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/**
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* @param {T} key
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* @param {V} value
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* @return {boolean}
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*/
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hasValue(key, value) {
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const set = this._map.get(key);
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if (!set)
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return false;
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return set.has(value);
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}
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/**
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* @return {number}
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*/
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get size() {
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return this._map.size;
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}
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/**
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* @param {T} key
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* @param {V} value
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* @return {boolean}
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*/
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delete(key, value) {
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const values = this.get(key);
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const result = values.delete(value);
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if (!values.size)
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this._map.delete(key);
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return result;
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}
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/**
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* @param {T} key
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*/
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deleteAll(key) {
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this._map.delete(key);
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}
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/**
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* @param {T} key
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* @return {V}
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*/
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firstValue(key) {
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const set = this._map.get(key);
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if (!set)
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return null;
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return set.values().next().value;
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}
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/**
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* @return {T}
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*/
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firstKey() {
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return this._map.keys().next().value;
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}
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/**
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* @return {!Array<V>}
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*/
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valuesArray() {
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const result = [];
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for (const key of this._map.keys())
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result.push(...Array.from(this._map.get(key).values()));
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return result;
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}
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/**
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* @return {!Array<T>}
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*/
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keysArray() {
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return Array.from(this._map.keys());
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}
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clear() {
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this._map.clear();
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}
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}
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module.exports = Multimap;
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