DataReader.hpp

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/* 
 * DataReader.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_BASE_DATAREADER_HPP
#define CDPL_BASE_DATAREADER_HPP
 
#include <cstddef>
#include <memory>
 
#include "CDPL/Base/DataIOBase.hpp"
 
 
namespace CDPL
{
 
    namespace Base
    {
 
        template <typename T>
        class DataReader : virtual public DataIOBase
        {
 
          public:
            typedef T DataType;
 
            typedef std::shared_ptr<DataReader> SharedPointer;
 
            virtual DataReader& read(DataType& obj, bool overwrite = true) = 0;
 
            virtual DataReader& read(std::size_t idx, DataType& obj, bool overwrite = true) = 0;
 
            virtual DataReader& skip() = 0;
 
            virtual bool hasMoreData() = 0;
 
            virtual std::size_t getRecordIndex() const = 0;
 
            virtual void setRecordIndex(std::size_t idx) = 0;
 
            virtual std::size_t getNumRecords() = 0;
 
            virtual operator const void*() const = 0;
 
            virtual bool operator!() const = 0;
 
            virtual void close() {}
 
          protected:
            DataReader& operator=(const DataReader& reader);
        };
 
        template <typename T>
        DataReader<T>& operator>>(DataReader<T>& reader, T& obj);
 
    } // namespace Base
} // namespace CDPL
 
 
// Implementation
 
template <typename T>
CDPL::Base::DataReader<T>& CDPL::Base::DataReader<T>::operator=(const DataReader& reader)
{
    if (this == &reader)
        return *this;
 
    DataIOBase::operator=(reader);
 
    return *this;
}
 
// \cond DOC_IMPL_DETAILS
 
template <typename T>
CDPL::Base::DataReader<T>& CDPL::Base::operator>>(DataReader<T>& reader, T& obj)
{
    return reader.read(obj);
}
 
// \endcond
 
#endif // CDPL_BASE_DATAREADER_HPP