DtPossibleFileNamesCache.h

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/******************************************************************************
** Copyright (c) 2022 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <map>

#include <boost/thread.hpp>

#include <unordered_map>
#include <tbb/spin_rw_mutex.h>
#include <set> 

namespace makVrv
{
   class DtDe;
   class DT_DLL_VRVOSG DtPossibleFileNamesCache
   {
   public:
      DtPossibleFileNamesCache(DtDe& de);

      virtual ~DtPossibleFileNamesCache();

      virtual bool hasUnderScoreInPossibleFileNames(void) const;

      virtual bool keyExists(const std::string& key) const;

      virtual void updateCache(const std::string& texturePath);

      struct TextureFileNameOperation
      {
      public:
         virtual void doOperation(const std::string& possibleFileName) = 0;
         virtual bool doContinue() const = 0;
      };

      virtual void transform(TextureFileNameOperation* op) const;

      static void clear();

   protected:
      std::string getPrefix(const std::string& texPath);

   protected:
      typedef std::map<std::string, std::string> FileNameMap;
      FileNameMap myPossibleFileNames;
      std::string myTexturePath;

      mutable boost::mutex myMutex;

      // shared data to avoid investigating the same directories over and over again
      static tbb::spin_rw_mutex theMapMutex;
      // for a directory, map lowercase to their original RegularCase names
      static std::unordered_map<std::string, std::unordered_map<std::string, std::string> > theDirRegToLowerCaseFileMap;
      // for a directory, keep an ordered set of lowercase file names 
      // (to help when we look for prefix matches based on incoming files)
      static std::unordered_map<std::string, std::set<std::string> > theDirLowerCaseFileSet;

      DtDe& myDe;
   };
}