diskstoragemanager.h

一个非常好的GIS开源新版本

// Spatial Index Library
//
// Copyright (C) 2002 Navel Ltd.
//
// 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
//
//  Email:
//    [e-mail]

#ifndef __storagemanager_diskstoragemanager_h
#define __storagemanager_diskstoragemanager_h

namespace SpatialIndex
{
	namespace StorageManager
	{
		class DiskStorageManager : public SpatialIndex::IStorageManager
		{
		public:
			DiskStorageManager(Tools::PropertySet&);
			virtual ~DiskStorageManager();

			void flush();

			virtual void loadByteArray(const long id, unsigned long& len, byte** data);
			virtual void storeByteArray(long& id, const unsigned long len, const byte* const data);
			virtual void deleteByteArray(const long id);

		private:
			class Entry
			{
			public:
				unsigned long m_length;
				std::vector<long> m_pages;
			};

			int m_dataFile;
			int m_indexFile;
			unsigned long m_pageSize;
			long m_nextPage;
			std::priority_queue<long, std::vector<long>, std::greater<long> > m_emptyPages;
			std::map<long, Entry*> m_pageIndex;

			unsigned char* m_buffer;
		}; // DiskStorageManager
	}
}

#endif /*__storagemanager_diskstoragemanager_h*/