react-native-blob-util/polyfill/FileReader.js

A module provides upload, download, and files access API. Supports file stream read/write for process large files.

// Copyright 2016 wkh237@github. All rights reserved.
// Use of this source code is governed by a MIT-style license that can be
// found in the LICENSE file.

import EventTarget from './EventTarget';
import Blob from './Blob';
import Log from '../utils/log.js';

const log = new Log('FileReader');

log.level(3);

export default class FileReader extends EventTarget {

    static get EMPTY() {
        return 0;
    }

    static get LOADING() {
        return 1;
    }

    static get DONE() {
        return 2;
    }

    // properties
    _readState: number = 0;
    _result: any;
    _error: any;

    get isRNFBPolyFill() {
        return true;
    }

    // event handlers
    onloadstart: (e: Event) => void;
    onprogress: (e: Event) => void;
    onload: (e: Event) => void;
    onabort: (e: Event) => void;
    onerror: (e: Event) => void;
    onloadend: (e: Event) => void;

    constructor() {
        super();
        log.verbose('file reader const');
        this._result = null;
    }

    abort() {
        log.verbose('abort');
    }

    readAsArrayBuffer(b: Blob) {
        log.verbose('readAsArrayBuffer', b);
    }

    readAsBinaryString(b: Blob) {
        log.verbose('readAsBinaryString', b);
    }

    readAsText(b: Blob, label: ?string) {
        log.verbose('readAsText', b, label);
    }

    readAsDataURL(b: Blob) {
        log.verbose('readAsDataURL', b);
    }

    dispatchEvent(event, e) {
        log.verbose('dispatch event', event, e);
        super.dispatchEvent(event, e);
        if (typeof this[`on${event}`] === 'function') {
            this[`on${event}`](e);
        }
    }

    // private methods

    // getters and setters

    get readyState() {
        return this._readyState;
    }

    get result() {
        return this._result;
    }


}