chrome/browser/resources/print_preview/data/page_number_set.js

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

cr.define('print_preview', function() {
  'use strict';

  /**
   * An immutable ordered set of page numbers.
   * @param {!Array.<number>} pageNumberList A list of page numbers to include
   *     in the set.
   * @constructor
   */
  function PageNumberSet(pageNumberList) {
    /**
     * Internal data store for the page number set.
     * @type {!Array.<number>}
     * @private
     */
    this.pageNumberSet_ = pageListToPageSet(pageNumberList);
  };

  PageNumberSet.prototype = {
    /** @return {number} The number of page numbers in the set. */
    get size() {
      return this.pageNumberSet_.length;
    },

    /**
     * @param {number} index 0-based index of the page number to get.
     * @return {number} Page number at the given index.
     */
    getPageNumberAt: function(index) {
      return this.pageNumberSet_[index];
    },

    /**
     * @param {number} 1-based page number to check for.
     * @return {boolean} Whether the given page number is in the page range.
     */
    hasPageNumber: function(pageNumber) {
      return arrayContains(this.pageNumberSet_, pageNumber);
    },

    /**
     * @param {number} 1-based number of the page to get index of.
     * @return {number} 0-based index of the given page number with respect to
     *     all of the pages in the page range.
     */
    getPageNumberIndex: function(pageNumber) {
      return this.pageNumberSet_.indexOf(pageNumber);
    },

    /** @return {!Array.<number>} Array representation of the set. */
    asArray: function() {
      return this.pageNumberSet_.slice(0);
    },
  };

  // Export
  return {
    PageNumberSet: PageNumberSet
  };
});