react-native-devtools-frontend/front_end/workspace/FileManager.js

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import * as Common from '../common/common.js';
import * as Host from '../host/host.js';

/** @type {?FileManager} */
let fileManagerInstance;

/**
 * @unrestricted
 */
export class FileManager extends Common.ObjectWrapper.ObjectWrapper {
  /**
   * @private
   */
  constructor() {
    super();
    /** @type {!Map<string, function(?{fileSystemPath: (string|undefined)}):void>} */
    this._saveCallbacks = new Map();
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.events.addEventListener(
        Host.InspectorFrontendHostAPI.Events.SavedURL, this._savedURL, this);
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.events.addEventListener(
        Host.InspectorFrontendHostAPI.Events.CanceledSaveURL, this._canceledSavedURL, this);
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.events.addEventListener(
        Host.InspectorFrontendHostAPI.Events.AppendedToURL, this._appendedToURL, this);
  }

  /**
   * @param {{forceNew: ?boolean}} opts
   */
  static instance(opts = {forceNew: null}) {
    const {forceNew} = opts;
    if (!fileManagerInstance || forceNew) {
      fileManagerInstance = new FileManager();
    }

    return fileManagerInstance;
  }

  /**
   * @param {string} url
   * @param {string} content
   * @param {boolean} forceSaveAs
   * @return {!Promise<?{fileSystemPath: (string|undefined)}>}
   */
  save(url, content, forceSaveAs) {
    // Remove this url from the saved URLs while it is being saved.
    const result = new Promise(resolve => this._saveCallbacks.set(url, resolve));
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.save(url, content, forceSaveAs);
    return result;
  }

  /**
   * @param {!Common.EventTarget.EventTargetEvent} event
   */
  _savedURL(event) {
    const url = /** @type {string} */ (event.data.url);
    const callback = this._saveCallbacks.get(url);
    this._saveCallbacks.delete(url);
    if (callback) {
      callback({fileSystemPath: /** @type {string} */ (event.data.fileSystemPath)});
    }
  }

  /**
   * @param {!Common.EventTarget.EventTargetEvent} event
   */
  _canceledSavedURL(event) {
    const url = /** @type {string} */ (event.data);
    const callback = this._saveCallbacks.get(url);
    this._saveCallbacks.delete(url);
    if (callback) {
      callback(null);
    }
  }

  /**
   * @param {string} url
   * @param {string} content
   */
  append(url, content) {
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.append(url, content);
  }

  /**
   * @param {string} url
   */
  close(url) {
    Host.InspectorFrontendHost.InspectorFrontendHostInstance.close(url);
  }

  /**
   * @param {!Common.EventTarget.EventTargetEvent} event
   */
  _appendedToURL(event) {
    const url = /** @type {string} */ (event.data);
    this.dispatchEventToListeners(Events.AppendedToURL, url);
  }
}

/** @enum {symbol} */
export const Events = {
  AppendedToURL: Symbol('AppendedToURL')
};