s2-tools/dist/dataStore/multimap/index.js

A collection of geospatial tools primarily designed for WGS84, Web Mercator, and S2.

import { compare, toCell } from '../../dataStructures/uint64';
/** A local multimap key-value store */
export class MultiMap {
    #store;
    #count = 0;
    /** Builds a new MultiMap */
    constructor() {
        this.#store = new Map();
    }
    /** @returns - the length of the map */
    get length() {
        return this.#count;
    }
    /**
     * Adds a value to the list of values associated with a key
     * @param key - the key
     * @param value - the value to store
     */
    set(key, value) {
        const list = this.get(key);
        if (list === undefined) {
            this.#store.set(key, [value]);
        }
        else {
            list.push(value);
        }
        this.#count++;
    }
    /**
     * Gets the list of values associated with a key
     * @param key - the key
     * @returns the list of values if the map contains values for the key
     */
    get(key) {
        return this.#store.get(key);
    }
    /**
     * iterate through the values
     * @yields - The values in the store
     */
    async *entries() {
        const entries = Array.from(this.#store.entries()).map(([id, value]) => [toCell(id), value]);
        entries.sort((a, b) => compare(a[0], b[0]));
        for (const [key, value] of entries) {
            yield { key, value };
        }
    }
    /**
     * iterate through the values
     * @returns - an iterator
     */
    [Symbol.asyncIterator]() {
        return this.entries();
    }
    /** Closes the store */
    close() {
        this.#store.clear();
    }
}
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