application.h

/*
 * application.h
 * This file is part of dbPager Classes Library (DCL)
 *
 * Copyright (c) 2008 Dennis Prochko <wolfsoft@mail.ru>
 *
 * DCL 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 version 3.
 *
 * DCL 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 DCL; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301  USA
 */

#ifndef _APPLICATION_H_
#define _APPLICATION_H_

#include <string>
#include <map>

#include <dcl/delegate.h>
#include <dcl/cmdline_parameters.h>
#include <dcl/singleton.h>

namespace dbp {


class application_int {
public:
        typedef delegate1<cmdline_parameter&, bool> cmdline_parameter_handler;
        typedef delegate0<int> on_execute_handler;
        typedef delegate1<const std::exception&, void> on_exception_handler;
        virtual ~application_int() { };

        virtual void set_name(const std::string &name) = 0;

        virtual void set_description(const std::string &description) = 0;

        virtual void register_cmdline_parameter(const cmdline_parameter &param,
          cmdline_parameter_handler handler) = 0;

        virtual void on_execute(on_execute_handler handler) = 0;
        virtual void on_exception(on_exception_handler handler) = 0;
        virtual int run(int argc, char *argv[]) = 0;
};


class application: public application_int,
  public singleton<application> {
        friend class singleton<application>;
public:
        virtual void set_name(const std::string &app_name);
        virtual void set_description(const std::string &description);
        virtual void register_cmdline_parameter(const cmdline_parameter &param,
          application_int::cmdline_parameter_handler handler);

        virtual void on_execute(on_execute_handler handler);
        virtual void on_exception(on_exception_handler handler);
        virtual int run(int argc, char *argv[]);

        const std::string& get_name() const {
                return _app_name;
        };

        const std::string& get_path() const {
                return _app_path;
        };

        const std::string& get_description() const {
                return _app_description;
        };
protected:
        application();
private:
        std::string _app_path, _app_name, _app_description;
        cmdline_parameters _params;
        typedef std::map<char, cmdline_parameter_handler>
          cmdline_parameter_handlers;
        cmdline_parameter_handlers _handlers;
        on_execute_handler execute_handler;
        on_exception_handler exception_handler;
        bool init(int argc, char *argv[]);
        bool cmdline_help_handler(cmdline_parameter &param);
        void print_cmdline_parameters_help();
};

} // namespace

#undef IMPLEMENT_APP
#define IMPLEMENT_APP(app)                                                                                                      \
int main(int argc, char *argv[]) {                                                                                      \
        return app.run(argc, argv);                                             \
};

#endif /*_APPLICATION_H_*/