FileDataWriter.hpp

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/* 
 * FileDataWriter.hpp 
 *
 * This file is part of the Chemical Data Processing Toolkit
 *
 * Copyright (C) 2003 Thomas Seidel <thomas.seidel@univie.ac.at>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
 
#ifndef CDPL_UTIL_FILEDATAWRITER_HPP
#define CDPL_UTIL_FILEDATAWRITER_HPP
 
#include <fstream>
#include <string>
#include <functional>
 
#include "CDPL/Base/DataWriter.hpp"
#include "CDPL/Base/Exceptions.hpp"
 
 
namespace CDPL
{
 
    namespace Util
    {
 
        template <typename WriterImpl, typename DataType = typename WriterImpl::DataType>
        class FileDataWriter : public Base::DataWriter<DataType>
        {
 
          public:
            FileDataWriter(const std::string&      file_name,
                           std::ios_base::openmode mode = std::ios_base::in | std::ios_base::out | std::ios_base::trunc | std::ios_base::binary);
 
            FileDataWriter& write(const DataType& obj);
 
            void close();
 
            operator const void*() const;
 
            bool operator!() const;
 
          private:
            std::fstream stream;
            std::string  fileName;
            WriterImpl   writer;
        };
    } // namespace Util
} // namespace CDPL
 
 
// Implementation
 
template <typename WriterImpl, typename DataType>
CDPL::Util::FileDataWriter<WriterImpl, DataType>::FileDataWriter(const std::string& file_name, std::ios_base::openmode mode):
    stream(file_name.c_str(), mode), fileName(file_name), writer(stream)
{
    if (!stream.good())
        throw Base::IOError("FileDataWriter: could not open file");
 
    writer.setParent(this);
    writer.registerIOCallback(std::bind(&Base::DataIOBase::invokeIOCallbacks, this, std::placeholders::_2));
}
 
template <typename WriterImpl, typename DataType>
CDPL::Util::FileDataWriter<WriterImpl, DataType>&
CDPL::Util::FileDataWriter<WriterImpl, DataType>::write(const DataType& obj)
{
    try {
        writer.write(obj);
 
    } catch (const std::exception& e) {
        throw Base::IOError("FileDataWriter: while writing file '" + fileName + "': " + e.what());
    }
 
    return *this;
}
 
template <typename WriterImpl, typename DataType>
void CDPL::Util::FileDataWriter<WriterImpl, DataType>::close()
{
    writer.close();
    stream.close();
}
 
template <typename WriterImpl, typename DataType>
CDPL::Util::FileDataWriter<WriterImpl, DataType>::operator const void*() const
{
    return writer.operator const void*();
}
 
template <typename WriterImpl, typename DataType>
bool CDPL::Util::FileDataWriter<WriterImpl, DataType>::operator!() const
{
    return writer.operator!();
}
 
#endif // CDPL_UTIL_FILEDATAWRITER_HPP