null-safe length check . concode_field_sep String DEFAULT_KEYVALUE_SEPARATOR concode_elem_sep String DEFAULT_SEPARATOR concode_field_sep String padFront concode_elem_sep StringBuilder appendKeyValue concode_elem_sep StringBuilder appendKeyValue concode_elem_sep String repeat concode_elem_sep String domainNamePointerToHostName
boolean function ( String arg0 ) { return arg0 == null || arg0 . length ( ) == 0 ; }