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E:/Projetos_Primeiro_Semestre_2012/TerraView/terralib/src/terralib/kernel/TeRasterMemManager.h
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    00001 /************************************************************************************
    00002 TerraLib - a library for developing GIS applications.
    00003 Copyright � 2001-2007 INPE and Tecgraf/PUC-Rio.
    00004
    00005 This code is part of the TerraLib library.
    00006 This library is free software; you can redistribute it and/or
    00007 modify it under the terms of the GNU Lesser General Public
    00008 License as published by the Free Software Foundation; either
    00009 version 2.1 of the License, or (at your option) any later version.
    00010
    00011 You should have received a copy of the GNU Lesser General Public
    00012 License along with this library.
    00013
    00014 The authors reassure the license terms regarding the warranties.
    00015 They specifically disclaim any warranties, including, but not limited to,
    00016 the implied warranties of merchantability and fitness for a particular purpose.
    00017 The library provided hereunder is on an "as is" basis, and the authors have no
    00018 obligation to provide maintenance, support, updates, enhancements, or modifications.
    00019 In no event shall INPE and Tecgraf / PUC-Rio be held liable to any party for direct,
    00020 indirect, special, incidental, or consequential damages arising out of the use
    00021 of this library and its documentation.
    00022 *************************************************************************************/
    00027 #ifndef TERASTERMEMMANAGER_H
    00028   #define TERASTERMEMMANAGER_H
    00029
    00030   #include "TeSharedPtr.h"
    00031
    00032   #include <vector>
    00033
    00038   class TL_DLL TeRasterMemManager {
    00039
    00040     public :
    00041
    00045       enum MemoryPolicy {
    00050         AutoMemPol = 1,
    00054         RAMMemPol = 2,
    00058         DiskMemPol = 3
    00059       };
    00060
    00064       TeRasterMemManager();
    00065
    00069       ~TeRasterMemManager();
    00070
    00074       void clear();
    00075
    00088       bool reset( unsigned int bands, unsigned int tilesPerBand,
    00089         const std::vector< unsigned int >& tilesSizesVec,
    00090         MemoryPolicy memoryPolicy, unsigned char maxMemPercentUsage,
    00091         unsigned long int maxTempFileSize );
    00092
    00100       void* getTilePointer( const unsigned int& band,
    00101         const unsigned int& tile );
    00102
    00103     protected :
    00104
    00108       class DiskTileData
    00109       {
    00110         public :
    00111           FILE* filePtr_;
    00112           unsigned long int fileOff_;
    00113           unsigned int size_;
    00114
    00115           DiskTileData() : filePtr_( 0 ), fileOff_( 0 ), size_( 0 ) {};
    00116
    00117           ~DiskTileData() {};
    00118       };
    00119
    00124       typedef unsigned char TileDataT;
    00125
    00130       typedef TileDataT* TilePtrT;
    00131
    00136       typedef std::vector< TilePtrT > TilesPtrsVecT;
    00137
    00142       typedef std::vector< DiskTileData >
    00143         DiskTileDataVecT;
    00144
    00149       typedef std::vector< std::pair< FILE*, std::string > >
    00150         OpenDiskFilesVecT;
    00151
    00156       unsigned char maxMemPercentUsage_;
    00157
    00161       unsigned long int maxTempFileSize_;
    00162
    00163       // Temp variables used by the getTilePointer method.
    00164       TilePtrT getTilePointer_tilePtr_;
    00165       unsigned int getTilePointer_reqTileIdx_;
    00166       unsigned int getTilePointer_swapTileIdx_;
    00167
    00171       unsigned int tilesPerBand_;
    00172
    00176       unsigned int bandsNmb_;
    00177
    00181       std::vector< unsigned int > bandsTileSizes_;
    00182
    00188       TilesPtrsVecT allTilesPtrsVec_;
    00189
    00193       OpenDiskFilesVecT openDiskFilesVec_;
    00194
    00198       DiskTileDataVecT diskTilesDataVec_;
    00199
    00203       std::vector< unsigned int > ramTilesIndexesVec_;
    00204
    00210       unsigned int nextSwapTileRamTilesIndexesVecIdx_;
    00211
    00216       TilePtrT swapTilePtr_;
    00217
    00227       bool allocateDiskFiles( unsigned int tileSize,
    00228         unsigned int tilesNmb, OpenDiskFilesVecT& openDiskFilesVec,
    00229         DiskTileDataVecT& diskTilesData );
    00230
    00238       bool createNewDiskFile( unsigned long int size,
    00239         std::string& filename, FILE** fileptr );
    00240
    00241     private :
    00242
    00247       TeRasterMemManager( const TeRasterMemManager& ) {};
    00248
    00253       const TeRasterMemManager& operator=( const TeRasterMemManager& )
    00254         { return *this; };
    00255
    00256   };
    00257
    00258 #endif
    00259

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