def self.read_from_xml file_name
    file_path = File.dirname __FILE__ + "/" + file_name

    unless File.exist? file_path
      abort puts "Файл #{file_name} - не найден."
    end

    file = File.new file_path, "r:UTF-8"
    doc = REXML::Document.new file
    file.close

    res = []
    item = nil

    doc.elements.each("products/product")do |product_node|
      it_price = product_node.attributes["price"].to_i
      it_store = product_node.attributes["store"].to_i

      product_node.elements.each("book")do |book_node|
        item = Book.new it_price, it_store
        item.update(book_node.attributes["title"],
                     book_node.attributes["author"])
        res << item
      end

      product_node.elements.each("disk")do |disk_node|
        item = Disk.new it_price, it_store

        item.update(disk_node.attributes["title"],
                disk_node.attributes["author"],
                disk_node.attributes["jendre"])
        res << item
      end

      product_node.elements.each("movie")do |movie_node|
        item = Movie.new it_price, it_store

        item.update(
            movie_node.attributes["title"],
            movie_node.attributes["author"],
            movie_node.attributes["release"]
        )
        res << item
      end
    end
    return res
  end