[Sgems-devel] Parsing a geostat algo parameter file

[RENARD P. <Phi...@un...>]

Bonjour !

I am trying to parse a geostat algo parameter file in order to analyze
it, check its coherence with respect to some external information and
simply run the simulation without modifying the parameters in a first
step. I have not succeeded in doing so yet and I would appreciate a
little (? hopefully) help.=20

What I have in my little program wrote is the following.

	// Open the parameter file
	std::ifstream paramfile( simul_parameter_file_name.c_str() ) ;
	if ( !paramfile ) {
		errors->report( "Simul_Parameter_File", "The simulation
parameter file could not be open" );
		return false;
	}

	// Read the parameter file and store it in a string
	std::string simul_parameter_string=3D"";
	char c;
	while (!paramfile.eof()) {
		c =3D paramfile.get();
		simul_parameter_string+=3Dc;
	}
	cerr << simul_parameter_string;


-->	The part above is working. The string contains the equivalent of
the file.  <---

	// Then this is something that Ting gave me:

	std::string parser =3D "/GeostatParamUtils/XML";
	SmartPtr<Named_interface> ni_handler =3D
		Root::instance()->new_interface( "Parameters_handler://"
+ simul_parameter_string,=20
		parser + "/" );

-->   The part above seems to work  the pointer contains some
information

	if( ni_handler.raw_ptr() =3D=3D 0 ) {
		appli_warning( "Manager " << parser=20
			<< " can't create interface for
Parameters_handler" );
		return false;
	}
	SmartPtr<Parameters_handler> _handler =3D
SmartPtr<Parameters_handler>(=20
      	dynamic_cast<Parameters_handler*>( ni_handler.raw_ptr() )
    		);=20


-->	At that point, there is a problem. _handler is initialized
correctly, but there is a flag that
	indicates that _is_ready is false.

	When I try to read information from the _handler (see below) it
doesn't return it.

=09
	// Retrieve the simulation algorithm name with the parameter
handler
	std::string algo=3D_handler->value( "algorithm.name" );

	launch_simul.assign(
algo+"::/GeostatParamUtils/XML::"+simul_parameter_string );

-->	And of course, when I try to run the simulation sgems crashes.

	proj->execute( "RunGeostatAlgorithm", launch_simul );


Any suggestion to solve the problem ?

Furthermore, I also need to modify in a second step the parameters
before running the simulations. I need that to condition each simulation
with a different synthetic data set. I planned to do it by substituting
some strings in the launch_simul string.

But, I wonder if there should not be a standard method to do that ? I
discussed about that this morning with Ting. He has the same type of
problem to solve for history matching. Ting wrote for his purpose an
access function that modifies the value of an entity through a parameter
handle. I wonder if this should not be made available to everybody ?=20

Thanks !

Cheers, Philippe