code: private List<Integer> getPageSizes() {
  
          final String pageSizes = parseOptionalStringValue(XML_ELEMENT_PAGESIZE);
          if (pageSizes != null) {
              String[] pageSizesArray = pageSizes.split("-");
              if (pageSizesArray.length > 0) {
                  try {
                      List<Integer> result = new ArrayList<>(pageSizesArray.length);
                      for (int i = 0; i < pageSizesArray.length; i++) {
                          result.add(Integer.valueOf(pageSizesArray[i]));
                      }
                      return result;
                  } catch (NumberFormatException e) {
                      LOG.warn(Messages.get().getBundle().key(Messages.LOG_PARSING_PAGE_SIZES_FAILED_1, pageSizes), e);
                  }
              }
          }
          return null;
      }
docs: Returns the configured page size, or the default page size if it is not configured.
  @return The configured page size, or the default page size if it is not configured.