/*
 * Request.h
 *
 * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef MAD_COMMON_REQUEST_H_
#define MAD_COMMON_REQUEST_H_

#include "RequestBase.h"
#include "Exception.h"

#include <memory>
#include <sigc++/hide.h>

namespace Mad {
namespace Common {

template<typename T = void> class Request : public RequestBase {
  private:
    sigc::signal<void,const Request<T>&> finished;

    std::auto_ptr<T> res;
    Exception exp;

  public:
    typedef sigc::slot<void,const Request<T>&> slot_type;

  protected:
    Request(slot_type slot) : exp(Exception::NOT_FINISHED) {
      finished.connect(slot);
      finished.connect(sigc::hide(signalFinished().make_slot()));
    }

    void finish(std::auto_ptr<T> result) {res = result; finished(*this);}
    void finish(const T& result) {res.reset(new T(result)); finished(*this);}
    void finishWithError(const Exception &e) {exp = e; finished(*this);}

  public:
    const T& getResult() const throw(Exception) {
      if(res.get())
        return *res;

      throw exp;
    }
};

template<> class Request<void> : public RequestBase {
  private:
    sigc::signal<void,const Request<void>&> finished;

    bool isFinished;
    Exception exp;

  public:
    typedef sigc::slot<void,const Request<void>&> slot_type;

  protected:
    Request(slot_type slot) : isFinished(false), exp(Exception::NOT_FINISHED) {
      finished.connect(slot);
      finished.connect(sigc::hide(signalFinished().make_slot()));
    }

    void finish() {isFinished = true; finished(*this);}
    void finishWithError(const Exception &e) {exp = e; finished(*this);}

  public:
    void getResult() const throw(Exception) {
      if(isFinished)
        return;

      throw exp;
    }
};

}
}

#endif /* MAD_COMMON_REQUEST_H_ */