DtPossibleFileNamesCache.h

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/******************************************************************************
** Copyright (c) 2017 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <map>

#include <boost/thread.hpp>

#include <boost/unordered_map.hpp>

#include <set>

namespace makVrv
{
   class DT_DLL_VRVOSG DtPossibleFileNamesCache
   {
   public:
      DtPossibleFileNamesCache();

      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;

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

      mutable boost::mutex myMutex;

      // for a directory, map lowercase to their original RegularCase names
      boost::unordered_map<std::string, boost::unordered_map<std::string, std::string> > myDirRegToLowerCaseFileMap;
      // for a directory, keep an ordered set of lowercase file names 
      // (to help when we look for prefix matches based on incoming files)
      boost::unordered_map<std::string, std::set<std::string> > myDirLowerCaseFileSet;
   };
}