/home/palakars/workspace-inprogress/code-in-progress/aitools3/aitools3-aq-invertedindex-cpp/src/reader/PostlistReader.hpp

Go to the documentation of this file.

/* Copyright (C) 2010 webis.de
 * All rights reserved.
 */
#ifndef AITOOLS_INVERTEDINDEX_POSTLIST_READER_HPP
#define AITOOLS_INVERTEDINDEX_POSTLIST_READER_HPP

#include "Iterator.hpp"
#include "NonCopyable.hpp"
#include <boost/shared_ptr.hpp>
#include <climits>

namespace bfs = boost::filesystem;

namespace aitools {
namespace invertedindex {

class PostlistReader : public NonCopyable {

public: // nested types

        typedef boost::shared_ptr<PostlistReader> shared_pointer;

private: // class data

        static const size_t sizeof_value_size_t = Iterator::sizeof_value_size_t;

public: // c'tor / d'tor

        PostlistReader();

        PostlistReader(const bfs::path& path) throw (std::invalid_argument);

        ~PostlistReader();

public: // member

        void close();

        inline bool is_open() const
        {
                return file_ != NULL;
        }

        void open(const bfs::path& path)
        throw (std::runtime_error, std::invalid_argument);

        Iterator::SharedPointer read(size_t length = INT_MAX)
        throw (std::runtime_error);

        const bfs::path& path() const;

        inline bool ready() const
        {
                return is_open() && std::feof(file_) == 0;
        }

        void rewind();

        void seek(size_t offset);

        size_t tell();

private: // data

        FILE*     file_;
        bfs::path path_;

};

} // namespace invertedindex
} // namespace aitools

#endif // AITOOLS_INVERTEDINDEX_POSTLIST_READER_HPP

---