react-native-fetch-blob/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 RNFetchBlob from '../index.js'
import ProgressEvent from './ProgressEvent.js'
import EventTarget from './EventTarget'
import Blob from './Blob'
import Log from '../utils/log.js'
import fs from '../fs'

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
  }



}