question: determines if the specified dn is known to this authority provider . concode_field_sep Map<String,Set<Authority>> users concode_field_sep void onConfigured concode_elem_sep void ungroupUser concode_elem_sep void preDestruction concode_elem_sep void addUser concode_elem_sep void revokeGroup concode_elem_sep void ungroup concode_elem_sep DownloadAuthorization authorizeDownload concode_elem_sep void checkDn concode_elem_sep Set<Authority> getAuthorities concode_elem_sep void revokeUser concode_elem_sep void setAuthorities concode_elem_sep void setUsersGroup concode_elem_sep Set<String> getUsers concode_elem_sep String getGroupForUser concode_elem_sep void initialize
target: boolean function ( String arg0 ) { try { checkDn ( arg0 ) ; return true ; } catch ( UnknownIdentityException loc0 ) { return false ; } }