bool ParameterListCallbackBlocked<LocalOrdinalT,GlobalOrdinalT,Node>::handlesRequest(const Teko::RequestMesg & rm)
{
   // check if is a parameter list message, and that the parameter
   // list contains the right fields
   if(rm.getName()=="Parameter List") {
     bool isHandled = true;
     Teuchos::RCP<const Teuchos::ParameterList> pl = rm.getParameterList();
     std::string field;
     if(pl->isType<std::string>("x-coordinates")) {
       field = pl->get<std::string>("x-coordinates");
       if(!isField(field)) {
         return false;
       }
     }
     if(pl->isType<std::string>("y-coordinates")) {
       // we assume that the fields must be the same
       if(field != pl->get<std::string>("y-coordinates")) {
         return false;
       }
     }
     if(pl->isType<std::string>("z-coordinates")) {
       // we assume that the fields must be the same
       if(field != pl->get<std::string>("z-coordinates")) {
         return false;
       }
     }

     return isHandled;
   }
   else return false;
}
void ParameterListCallbackBlocked<LocalOrdinalT,GlobalOrdinalT,Node>::preRequest(const Teko::RequestMesg & rm)
{
   TEUCHOS_ASSERT(handlesRequest(rm)); // design by contract

   const std::string & field = getHandledField(*rm.getParameterList());
   int block = blocked_ugi_->getFieldBlock(blocked_ugi_->getFieldNum(field));

   // empty...nothing to do
   buildArrayToVector(block,field);
   buildCoordinates(field);
}
Teuchos::RCP<Teuchos::ParameterList> ParameterListCallback<LocalOrdinalT,GlobalOrdinalT,Node>::request(const Teko::RequestMesg & rm)
{
   TEUCHOS_ASSERT(handlesRequest(rm)); // design by contract

   // loop over parameter list and set the field by a particular key
   Teuchos::RCP<Teuchos::ParameterList> outputPL = rcp(new Teuchos::ParameterList);
   Teuchos::RCP<const Teuchos::ParameterList> inputPL = rm.getParameterList();
   Teuchos::ParameterList::ConstIterator itr;
   for(itr=inputPL->begin();itr!=inputPL->end();++itr)
      setFieldByKey(itr->first,*outputPL);

   return outputPL;
}
Teuchos::RCP<Teuchos::ParameterList> 
ParameterListCallbackBlocked<LocalOrdinalT,GlobalOrdinalT,Node>::request(const Teko::RequestMesg & rm)
{
   TEUCHOS_ASSERT(handlesRequest(rm)); // design by contract

   // loop over parameter list and set the field by a particular key
   Teuchos::RCP<Teuchos::ParameterList> outputPL = rcp(new Teuchos::ParameterList);
   Teuchos::RCP<const Teuchos::ParameterList> inputPL = rm.getParameterList();
   Teuchos::ParameterList::ConstIterator itr;
   for(itr=inputPL->begin();itr!=inputPL->end();++itr) {
      std::string * str_ptr = 0; // just used as a template specifier
      std::string field = inputPL->entry(itr).getValue(str_ptr);
      setFieldByKey(itr->first,field,*outputPL);
   }

   return outputPL;
}