flightgear/src/Airports/simple.cxx

//
// simple.cxx -- a really simplistic class to manage airport ID,
//                 lat, lon of the center of one of it's runways, and 
//                 elevation in feet.
//
// Written by Curtis Olson, started April 1998.
//
// Copyright (C) 1998  Curtis L. Olson  - curt@me.umn.edu
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id$


#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

// #include <sys/types.h>		// for gdbm open flags
// #include <sys/stat.h>		// for gdbm open flags

// #ifdef HAVE_GDBM
// #  include <gdbm.h>
// #else
// #  include <simgear/gdbm/gdbm.h>
// #endif

#include <simgear/compiler.h>

#include <simgear/debug/logstream.hxx>
#include <simgear/misc/fgstream.hxx>

#include <Main/options.hxx>

#include STL_STRING
#include STL_FUNCTIONAL
#include STL_ALGORITHM

#include "simple.hxx"

FG_USING_NAMESPACE(std);

FGAirports::FGAirports( const string& file ) {
    // open the specified database readonly
    storage = new c4_Storage( file.c_str(), false );

    if ( !storage->Strategy().IsValid() ) {
	FG_LOG( FG_GENERAL, FG_ALERT, "Cannot open file: " << file );
	exit(-1);
    }

    vAirport = new c4_View;
    *vAirport = 
	storage->GetAs("airport[ID:S,Longitude:F,Latitude:F,Elevation:F]");
}


// search for the specified id
bool
FGAirports::search( const string& id, FGAirport* a ) const
{
    c4_StringProp pID ("ID");
    c4_FloatProp pLon ("Longitude");
    c4_FloatProp pLat ("Latitude");
    c4_FloatProp pElev ("Elevation");

    int idx = vAirport->Find(pID[id.c_str()]);
    cout << "idx = " << idx << endl;

    if ( idx == -1 ) {
	return false;
    }

    c4_RowRef r = vAirport->GetAt(idx);

    a->longitude = (double) pLon(r);
    a->latitude =  (double) pLat(r);
    a->elevation = (double) pElev(r);

    return true;
}


FGAirport
FGAirports::search( const string& id ) const
{
    FGAirport a;
    search( id, &a );
    return a;
}


// Destructor
FGAirports::~FGAirports( void ) {
    // gdbm_close( dbf );
}


// Constructor
FGAirportsUtil::FGAirportsUtil() {
}


// load the data
int FGAirportsUtil::load( const string& file ) {
    FGAirport a;

    airports.erase( airports.begin(), airports.end() );

    fg_gzifstream in( file );
    if ( !in.is_open() ) {
	FG_LOG( FG_GENERAL, FG_ALERT, "Cannot open file: " << file );
	exit(-1);
    }

    /*
    // We can use the STL copy algorithm because the input
    // file doesn't contain and comments or blank lines.
    copy( istream_iterator<FGAirport,ptrdiff_t>(in.stream()),
	  istream_iterator<FGAirport,ptrdiff_t>(),
 	  inserter( airports, airports.begin() ) );
    */

    // read in each line of the file

#ifdef __MWERKS__

    in >> skipcomment;
    char c = 0;
    while ( in.get(c) && c != '\0' ) {
	in.putback(c);
	in >> a;
	airports.insert(a);
	in >> skipcomment;
    }

#else

    in >> skipcomment;
    while ( ! in.eof() ) {
	in >> a;
	airports.insert(a);
	in >> skipcomment;
    }

#endif

    return 1;
}


// save the data in gdbm format
bool FGAirportsUtil::dump_mk4( const string& file ) {

    // open database for writing
    c4_Storage storage( file.c_str(), true );

    // need to do something about error handling here!

    // define the properties
    c4_StringProp pID ("ID");
    c4_FloatProp pLon ("Longitude");
    c4_FloatProp pLat ("Latitude");
    c4_FloatProp pElev ("Elevation");

    // Start with an empty view of the proper structure.
    c4_View vAirport =
	storage.GetAs("airport[ID:S,Longitude:F,Latitude:F,Elevation:F]");

    c4_Row row;

    iterator current = airports.begin();
    const_iterator end = airports.end();
    while ( current != end ) {
	// add each airport record
	pID (row) = current->id.c_str();
	pLon (row) = current->longitude;
	pLat (row) = current->latitude;
	pElev (row) = current->elevation;
	vAirport.Add(row);

	++current;
    }

    // commit our changes
    storage.Commit();

    return true;
}


// search for the specified id
bool
FGAirportsUtil::search( const string& id, FGAirport* a ) const
{
    const_iterator it = airports.find( FGAirport(id) );
    if ( it != airports.end() )
    {
	*a = *it;
	return true;
    }
    else
    {
	return false;
    }
}


FGAirport
FGAirportsUtil::search( const string& id ) const
{
    FGAirport a;
    this->search( id, &a );
    return a;
}


// Destructor
FGAirportsUtil::~FGAirportsUtil( void ) {
}