module RubyXL::LegacyCell

def validate_workbook
  unless workbook.nil? || workbook.worksheets.nil?
    workbook.worksheets.each { |sheet|
      unless sheet.nil? || sheet.sheet_data.nil? || sheet.sheet_data[row].nil?
        if sheet.sheet_data[row][column] == self
          return
        end
      end
    }
  end
  raise "This cell #{self} is not in workbook #{workbook}"
end

def validate_worksheet
  return if @worksheet && @worksheet[row] && @worksheet[row][column].equal?(self)
  raise "Cell #{self} is not in worksheet #{worksheet}"
end

def workbook
  @worksheet.workbook
end