gis-tools-ts/dist/dataStore/vector/mmap.js

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

import { S2MMapStore } from '../mmap.js';
/**
 * # Vector MMap Store
 *
 * ## Description
 * A mmap vector store
 *
 * ## Usage
 * ```ts
 * import { MMapVector } from 'gis-tools-ts/mmap';
 * import type { VectorKey } from 'gis-tools-ts';
 *
 * interface Data extends VectorKey { name: string };
 *
 * const vec = new MMapVector<Data>();
 * // push an entry
 * vec.push({ cell: 1n, name: 'test' });
 * vec.push({ cell: 1n, name: 'test2' });
 * // check if a key exists
 * vec.has(1n); // true
 * // get length of the store
 * console.log(vec.length); // 2
 *
 * // iterate over the store
 * for await (const entry of vec) console.log(entry);
 *
 * // close the store
 * vec.close();
 * ```
 */
export class MMapVector {
    #store;
    /** @param fileName - the path + file name without the extension */
    constructor(fileName) {
        this.#store = new S2MMapStore(fileName);
    }
    /** @returns the length of the store */
    get length() {
        return this.#store.length;
    }
    /**
     * Push a value into the store
     * @param value - the value to store
     */
    push(value) {
        this.#store.set(value.cell, value);
    }
    /**
     * @param index - the position in the store to get the value from
     * @returns the value
     */
    async get(index) {
        const value = await this.#store.get(BigInt(index));
        if (value === undefined)
            throw new Error('Value not found');
        return value[0];
    }
    /**
     * Check if the key exists
     * @param key - the key
     * @returns true if the key exists
     */
    async has(key) {
        return await this.#store.has(BigInt(key));
    }
    /** Sort the store */
    async sort() {
        await this.#store.sort();
    }
    /**
     * iterate through the values
     * @yields {V} - the values 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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