BLAsciiFile.hh

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//      BLAsciiFile.hh
/*
This source file is part of G4beamline, http://g4beamline.muonsinc.com
Copyright (C) 2003,2004,2005,2006 by Tom Roberts, all rights reserved.

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.

http://www.gnu.org/copyleft/gpl.html
*/

#ifndef BLASCIIFILE
#define BLASCIIFILE

#include <map>
#include <set>
#include <stdio.h>

#include "globals.hh"

/**     class BLAsciiFile manages file-descriptors for writing ASCII files.
 *
 *      Multiple fopen()-s of a given filename will all get the same FILE *.
 *      Multiple fclose()-s of the FILE* are handled properly (fhe first 
 *      closes the file, successive ones do nothing).
 *
 *      The filename-s must match exactly as given, no conversion to absolute
 *      paths (or any other canonicalization) is performed..
 *
 *      Only does writing.
 **/
class BLAsciiFile {
        static std::map<G4String,FILE*> fds;
public:
        /// fopen() will open a file for writing, returning the same FILE *
        /// for multiple opens.
        static FILE *fopen(G4String name) {
                if(fds.count(name) == 0) {
                        FILE *f = ::fopen(name.c_str(),"w");
                        if(f != 0)
                                fds[name] = f;
                        return f;
                }
                return fds[name];
        }

        /// fclose() will close the FILE*, handling multiple calls.
        static void fclose(FILE *f) {
                std::map<G4String,FILE*>::iterator i;
                for(i=fds.begin(); i!=fds.end(); ++i) {
                        if(i->second != f) continue;
			::fclose(f);
                        fds.erase(i);
                        break;
                }
        }
};

#endif // BLASCIIFILE