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

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

import { S2FileStore } from '../file';
/** File based multimap store */
export class FileKV {
    #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) {
        const value = await this.#store.get(key, 0);
        if (value === undefined)
            return undefined;
        return value[0];
    }
    /**
     * iterate through the values
     * @yields an iterator
     */
    async *values() {
        for await (const { value } of this.#store.entries())
            yield value;
    }
    /**
     * iterate through the values
     * @returns an iterator
     */
    [Symbol.asyncIterator]() {
        return this.values();
    }
    /** Closes the store */
    close() {
        this.#store.close(true);
    }
}
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