code: private void setSiteFilters(String filters) {
  		this.filterSites = new HashSet<>();
  		if (!"-".equals(filters)) {
  			Collections.addAll(this.filterSites, filters.split(","));
  		}
  	}
docs: Sets the set of site filters based on the given string.
  
  @param filters
  comma-separates list of site keys, or "-" to filter all site
  links