Mapping method names

Though there are strict rules for filter method signatures with respect to corresponding server method, no such rules exist regarding naming of filter methods. Hence the names filter methods need to be mapped to the corresponding server methods, they are supposed to filter. The upfilter and the downfilter methods of the CORBA::Filter class map the upfilter and downfilter method names to that of the server class. The mappings are established after a filter object is created. Unless the methods are appropriately mapped, filtering action cannot occur even if the filter has been plugged to the server. In such cases the call will continue normally as if no filter exists.