AreaIndex.h

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#ifndef LIBOSMSCOUT_AREAYINDEX_H
#define LIBOSMSCOUT_AREAYINDEX_H
/*
  This source is part of the libosmscout library
  Copyright (C) 2011  Tim Teulings
 
  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 2.1 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; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
*/
 
#include <memory>
#include <mutex>
#include <unordered_set>
#include <vector>
 
#include <osmscout/TypeConfig.h>
#include <osmscout/TypeInfoSet.h>
 
#include <osmscout/io/FileScanner.h>
 
#include <osmscout/util/TileId.h>
 
namespace osmscout {

  class OSMSCOUT_API AreaIndex
  {
  protected:
    struct TypeData
    {
      TypeInfoRef         type;
      MagnificationLevel  indexLevel;
 
      uint8_t             dataOffsetBytes;
      FileOffset          bitmapOffset;
 
      TileIdBox           tileBox;
 
      GeoBox              boundingBox;
 
      TypeData();
 
      FileOffset GetDataOffset() const;
      FileOffset GetCellOffset(size_t x, size_t y) const;
    };
 
  private:
    std::string           indexFileName;
    std::string           fullIndexFileName;  
 
    std::vector<TypeData> typeData;
 
    mutable std::mutex    lookupMutex;
 
  protected:
    mutable FileScanner   scanner;            
 
  protected:
    void GetOffsets(const TypeData& typeData,
                    const GeoBox& boundingBox,
                    std::unordered_set<FileOffset>& offsets) const;
 
    explicit AreaIndex(const std::string &indexFileName);
 
    virtual void ReadTypeData(const TypeConfigRef& typeConfig,
                              TypeData &data) = 0;
 
  public:
    AreaIndex() = default;
 
    // disable copy and move
    AreaIndex(const AreaIndex&) = delete;
    AreaIndex(AreaIndex&&) = delete;
    AreaIndex& operator=(const AreaIndex&) = delete;
    AreaIndex& operator=(AreaIndex&&) = delete;
 
    virtual ~AreaIndex();
 
    void Close();
    bool Open(const TypeConfigRef& typeConfig,
              const std::string& path,
              bool memoryMappedData);
 
    bool IsOpen() const
    {
      return scanner.IsOpen();
    }
 
    std::string GetFilename() const
    {
      return fullIndexFileName;
    }
 
    bool GetOffsets(const GeoBox& boundingBox,
                    const TypeInfoSet& types,
                    std::vector<FileOffset>& offsets,
                    TypeInfoSet& loadedTypes) const;
  };
}
 
#endif //LIBOSMSCOUT_AREAYINDEX_H