docs: def _join_all_filenames_and_text(
              self):
          """
          *join all file names, driectory names and text content together*
          """
          self.log.info('starting the ``_join_all_filenames_and_text`` method')
  
          contentString = u""
          for i in self.directoryContents:
              contentString += u"%(i)s\n" % locals()
              if os.path.isfile(os.path.join(i)):
                  if i[-4:] in [".png", ".jpg", ".gif"]:
                      continue
                  readFile = codecs.open(i, encoding='ISO-8859-1', mode='r')
                  if ".DS_Store" in i:
                      continue
                  data = readFile.read()
                  contentString += u"%(data)s\n" % locals()
                  readFile.close()
  
          self.contentString = contentString
  
          self.log.info('completed the ``_join_all_filenames_and_text`` method')
          return None