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

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

import { S2FileStore } from '../file';
import { compare } from '../../dataStructures/uint64';
/** File based multimap store */
export class FileMultiMap {
    #store;
    /**
     * Builds a new MultiMap file store
     * @param fileName - the path + file name without the extension
     */
    constructor(fileName) {
        this.#store = new S2FileStore(fileName);
    }
    /** @returns - the length of the map */
    get length() {
        return this.#store.length;
    }
    /**
     * 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) {
        this.#store.set(key, value);
    }
    /**
     * 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
     */
    async get(key) {
        return await this.#store.get(key);
    }
    /**
     * iterate through the values
     * @yields - The values in the store
     */
    async *entries() {
        let entries = [];
        for await (const entry of this.#store.entries()) {
            if (entries.length > 0) {
                const curr = entries[0];
                if (compare(curr.key, entry.key) === 0) {
                    entries.push(entry);
                }
                else {
                    yield { key: curr.key, value: entries.map((e) => e.value) };
                    entries = [entry];
                }
            }
            else {
                entries.push(entry);
            }
        }
        if (entries.length > 0)
            yield { key: entries[0].key, value: entries.map((e) => e.value) };
    }
    /**
     * iterate through the values
     * @returns - an iterator
     */
    [Symbol.asyncIterator]() {
        return this.entries();
    }
    /** Closes the store */
    close() {
        this.#store.close(true);
    }
}
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