text: /*
   * 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.
   */
  
  /**
   * @interface
   */
  export default class Progress {
    /**
     * @param {number} totalWork
     */
    setTotalWork(totalWork) {
    }
  
    /**
     * @param {string} title
     */
    setTitle(title) {
    }
  
    /**
     * @param {number} worked
     * @param {string=} title
     */
    setWorked(worked, title) {
    }
  
    /**
     * @param {number=} worked
     */
    worked(worked) {
    }
  
    done() {
    }
  
    /**
     * @return {boolean}
     */
    isCanceled() {
      return false;
    }
  }
  
  /**
   * @unrestricted
   */
  export class CompositeProgress {
    /**
     * @param {!Common.Progress} parent
     */
    constructor(parent) {
      this._parent = parent;
      this._children = [];
      this._childrenDone = 0;
      this._parent.setTotalWork(1);
      this._parent.setWorked(0);
    }
  
    _childDone() {
      if (++this._childrenDone !== this._children.length)
        return;
      this._parent.done();
    }
  
    /**
     * @param {number=} weight
     * @return {!Common.SubProgress}
     */
    createSubProgress(weight) {
      const child = new Common.SubProgress(this, weight);
      this._children.push(child);
      return child;
    }
  
    _update() {
      let totalWeights = 0;
      let done = 0;
  
      for (let i = 0; i < this._children.length; ++i) {
        const child = this._children[i];
        if (child._totalWork)
          done += child._weight * child._worked / child._totalWork;
        totalWeights += child._weight;
      }
      this._parent.setWorked(done / totalWeights);
    }
  }
  
  /**
   * @implements {Common.Progress}
   * @unrestricted
   */
  export class SubProgress {
    /**
     * @param {!Common.CompositeProgress} composite
     * @param {number=} weight
     */
    constructor(composite, weight) {
      this._composite = composite;
      this._weight = weight || 1;
      this._worked = 0;
    }
  
    /**
     * @override
     * @return {boolean}
     */
    isCanceled() {
      return this._composite._parent.isCanceled();
    }
  
    /**
     * @override
     * @param {string} title
     */
    setTitle(title) {
      this._composite._parent.setTitle(title);
    }
  
    /**
     * @override
     */
    done() {
      this.setWorked(this._totalWork);
      this._composite._childDone();
    }
  
    /**
     * @override
     * @param {number} totalWork
     */
    setTotalWork(totalWork) {
      this._totalWork = totalWork;
      this._composite._update();
    }
  
    /**
     * @override
     * @param {number} worked
     * @param {string=} title
     */
    setWorked(worked, title) {
      this._worked = worked;
      if (typeof title !== 'undefined')
        this.setTitle(title);
      this._composite._update();
    }
  
    /**
     * @override
     * @param {number=} worked
     */
    worked(worked) {
      this.setWorked(this._worked + (worked || 1));
    }
  }
  
  /**
   * @implements {Common.Progress}
   * @unrestricted
   */
  export class ProgressProxy {
    /**
     * @param {?Common.Progress} delegate
     * @param {function()=} doneCallback
     */
    constructor(delegate, doneCallback) {
      this._delegate = delegate;
      this._doneCallback = doneCallback;
    }
  
    /**
     * @override
     * @return {boolean}
     */
    isCanceled() {
      return this._delegate ? this._delegate.isCanceled() : false;
    }
  
    /**
     * @override
     * @param {string} title
     */
    setTitle(title) {
      if (this._delegate)
        this._delegate.setTitle(title);
    }
  
    /**
     * @override
     */
    done() {
      if (this._delegate)
        this._delegate.done();
      if (this._doneCallback)
        this._doneCallback();
    }
  
    /**
     * @override
     * @param {number} totalWork
     */
    setTotalWork(totalWork) {
      if (this._delegate)
        this._delegate.setTotalWork(totalWork);
    }
  
    /**
     * @override
     * @param {number} worked
     * @param {string=} title
     */
    setWorked(worked, title) {
      if (this._delegate)
        this._delegate.setWorked(worked, title);
    }
  
    /**
     * @override
     * @param {number=} worked
     */
    worked(worked) {
      if (this._delegate)
        this._delegate.worked(worked);
    }
  }
  
  /* Legacy exported object */
  self.Common = self.Common || {};
  Common = Common || {};
  
  /**
   * @interface
   */
  Common.Progress = Progress;
  
  /**
   * @constructor
   */
  Common.CompositeProgress = CompositeProgress;
  
  /**
   * @constructor
   */
  Common.SubProgress = SubProgress;
  
  /**
   * @constructor
   */
  Common.ProgressProxy = ProgressProxy;
  