react-native-blob-util/class/ReactNativeBlobUtilWriteStream.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 ReactNativeBlobUtil from '../codegenSpecs/NativeBlobUtils';
export default class ReactNativeBlobUtilWriteStream {

  id : string;
  encoding : string;
  append : boolean;

  constructor(streamId:string, encoding:string, append:boolean) {
    this.id = streamId;
    this.encoding = encoding;
    this.append = append;
  }

  write(data:string): Promise<ReactNativeBlobUtilWriteStream> {
    return new Promise((resolve, reject) => {
      try {
        let method = this.encoding === 'ascii' ? 'writeArrayChunk' : 'writeChunk';
        if (this.encoding.toLocaleLowerCase() === 'ascii' && !Array.isArray(data)) {
            reject(new Error('ascii input data must be an Array'));
            return;
        }
        ReactNativeBlobUtil[method](this.id, data, (error) => {
          if (error)
            reject(new Error(error));
          else
            resolve(this);
        });
      } catch (err) {
        reject(new Error(err));
      }
    });
  }

  close() {
    return new Promise((resolve, reject) => {
      try {
        ReactNativeBlobUtil.closeStream(this.id, () => {
          resolve();
        });
      } catch (err) {
        reject(new Error(err));
      }
    });
  }

}