/******************************************************************************
 * Project:  libspatialindex - A C++ library for spatial indexing
 * Author:   Marios Hadjieleftheriou, mhadji@gmail.com
 ******************************************************************************
 * Copyright (c) 2002, Marios Hadjieleftheriou
 *
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
******************************************************************************/

#pragma once

#include <cstring>

using namespace SpatialIndex;
using namespace SpatialIndex::StorageManager;

namespace SpatialIndex
{
	namespace StorageManager
	{
		class Buffer : public IBuffer
		{
		public:
			Buffer(IStorageManager& sm, Tools::PropertySet& ps);
				// String                   Value     Description
				// ----------------------------------------------
				// Capacity		VT_ULONG	Buffer maximum capacity.
				// WriteThrough	VT_BOOL	Enable or disable write through policy.

			virtual ~Buffer();

			virtual void flush();
			virtual void loadByteArray(const id_type page, uint32_t& len, byte** data);
			virtual void storeByteArray(id_type& page, const uint32_t len, const byte* const data);
			virtual void deleteByteArray(const id_type page);

			virtual void clear();
			virtual uint64_t getHits();

		protected:
			class Entry
			{
			public:
				Entry(uint32_t l, const byte* const d) : m_pData(0), m_length(l), m_bDirty(false)
				{
					m_pData = new byte[m_length];
					memcpy(m_pData, d, m_length);
				}

				~Entry() { delete[] m_pData; }

				byte* m_pData;
				uint32_t m_length;
				bool m_bDirty;
			}; // Entry

			virtual void addEntry(id_type page, Entry* pEntry) = 0;
			virtual void removeEntry() = 0;

			uint32_t m_capacity;
			bool m_bWriteThrough;
			IStorageManager* m_pStorageManager;
			std::map<id_type, Entry*> m_buffer;
			uint64_t m_u64Hits;
		}; // Buffer
	}
}