nl: remove all countries that are not defined in the set concode_field_sep HashMap<String,String[]> countryLookup concode_elem_sep ArrayList<String> pingErCountry concode_elem_sep ArrayList<String> pingErRegion concode_elem_sep long serialVersionUID concode_elem_sep Logger log concode_elem_sep HashMap<String,String> pingErCountryRegions concode_elem_sep String pingErCountryRegionFilename concode_field_sep void importPingErCountryRegionFile concode_elem_sep String getGeoIpCountryName concode_elem_sep String getPingErCountryName concode_elem_sep boolean containsPingErCountryOrRegion concode_elem_sep ArrayList<String> getPingErRegions concode_elem_sep void addCountryFromGeoIP concode_elem_sep String getPingErCountryRegionFilename concode_elem_sep Element exportToXML concode_elem_sep void assignCountryCodeToPingErData concode_elem_sep Set<String> getCountryCodes concode_elem_sep String getPingErRegionName concode_elem_sep ArrayList<String> getPingErCountrys concode_elem_sep void importFromXML concode_elem_sep void importFromXML
code: void function ( Set < String > arg0 ) { countryLookup . keySet ( ) . retainAll ( arg0 ) ; }