FlagMap.h

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/***************************************************************************
 *
 * Copyright (C) 2009-2010 Cassio Neri Moreira
 *
 * This file is part of the KeyValue library.
 *
 * The KeyValue library 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.
 *
 * The KeyValue library 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 KeyValue. If not, see <http://www.gnu.org/licenses/>.
 *
 * If you modify this library, or any covered work, by linking or combining
 * it with Excel (or a modified version of that program), containing parts
 * covered by the terms of End-User License Agreement for Microsoft
 * Software, the licensors of KeyValue grant you additional permission to
 * convey the resulting work.
 *
 **************************************************************************/

#ifndef KEYVALUE_KEY_MAP_FLAGMAP_H_
#define KEYVALUE_KEY_MAP_FLAGMAP_H_

#include "keyvalue/extern/String.h"
#include "keyvalue/key/Key.h"
#include "keyvalue/sys/exception/Exception.h"
#include "keyvalue/value/Variant.h"

namespace keyvalue {
namespace key {

template <typename OutputType>
class FlagMap {

public:

  typedef OutputType OutputType_;

  OutputType
  map(const value::Variant& variant) const;

  virtual OutputType
  get(const string& name) const = 0;

private:

  virtual string
  getName() const = 0;

}; // class FlagMap

/*--------------------------------------------------------------------------
 * map()
 *------------------------------------------------------------------------*/

template<typename OutputType>
OutputType
FlagMap<OutputType>::map(const value::Variant& variant) const {

  if (variant.is<string>(frontend::LexicalToolKit::input)) {

    try {
      return get(variant.get<string>(frontend::LexicalToolKit::input));
    }

    catch (frontend::LexicalToolKit::Failure&) {
    }
  }

  throw RuntimeError() & "Invalid value '" & variant & "' for key '" &
    getName() & "'!";
}

} // namespace key
} // namespace keyvalue

#endif // KEYVALUE_KEY_MAP_FLAGMAP_H_