code: def _getAnnotationAnalysis(self, varFile):
          
          header = varFile.header
          analysis = protocol.Analysis()
          formats = header.formats.items()
          infos = header.info.items()
          filters = header.filters.items()
          for prefix, content in [("FORMAT", formats), ("INFO", infos),
                                  ("FILTER", filters)]:
              for contentKey, value in content:
                  key = "{0}.{1}".format(prefix, value.name)
                  if key not in analysis.attributes.attr:
                      analysis.attributes.attr[key].Clear()
                  if value.description is not None:
                      analysis.attributes.attr[
                          key].values.add().string_value = value.description
          analysis.created = self._creationTime
          analysis.updated = self._updatedTime
          for r in header.records:
              # Don't add a key to info if there's nothing in the value
              if r.value is not None:
                  if r.key not in analysis.attributes.attr:
                      analysis.attributes.attr[r.key].Clear()
                  analysis.attributes.attr[r.key] \
                      .values.add().string_value = str(r.value)
              if r.key == "created" or r.key == "fileDate":
                  # TODO handle more date formats
                  try:
                      if '-' in r.value:
                          fmtStr = "%Y-%m-%d"
                      else:
                          fmtStr = "%Y%m%d"
                      analysis.created = datetime.datetime.strptime(
                          r.value, fmtStr).isoformat() + "Z"
                  except ValueError:
                      # is there a logger we should tell?
                      # print("INFO: Could not parse variant annotation time")
                      pass  # analysis.create_date_time remains datetime.now()
              if r.key == "software":
                  analysis.software.append(r.value)
              if r.key == "name":
                  analysis.name = r.value
              if r.key == "description":
                  analysis.description = r.value
          analysis.id = str(datamodel.VariantAnnotationSetAnalysisCompoundId(
              self._compoundId, "analysis"))
          return analysis
docs: Assembles metadata within the VCF header into a GA4GH Analysis object.
  
          :return: protocol.Analysis