code: protected List<String> getSpaces(String host, ContentStore store)
          throws ContentStoreException {
          List<String> spaceList;
          String spaces = dupHosts.get(host);
          if (spaces.equals(ALL_SPACES)) { // Need to compare all spaces
              spaceList = new ArrayList<>(store.getSpaces());
              spaceList.removeAll(ADMIN_SPACES);
          } else { // Only compare specific set of spaces
              String[] spacesToCompare = spaces.split(",");
              spaceList = Arrays.asList(spacesToCompare);
          }
          return spaceList;
      }
docs: /*
  Determine the spaces which need to be compared. If a space list is
  provided for a given account, use that list, otherwise compare
  all user spaces.