text: //
  // Copyright (c) 2008-2019 the Urho3D project.
  //
  // 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.
  //
  
  #include "../Precompiled.h"
  
  #include "../Core/StringHashRegister.h"
  #include "../Core/Mutex.h"
  #include "../IO/Log.h"
  
  #include <cstdio>
  
  #include "../DebugNew.h"
  
  namespace Urho3D
  {
  
  StringHashRegister::StringHashRegister(bool threadSafe)
  {
      if (threadSafe)
          mutex_ = ea::make_unique<Mutex>();
  }
  
  
  StringHashRegister::~StringHashRegister()       // NOLINT(hicpp-use-equals-default, modernize-use-equals-default)
  {
      // Keep destructor here to let mutex_ destruct
  }
  
  StringHash StringHashRegister::RegisterString(const StringHash& hash, const char* string)
  {
      if (mutex_)
          mutex_->Acquire();
  
      auto iter = map_.find(hash);
      if (iter == map_.end())
      {
          map_.populate(hash, string);
      }
      else if (iter->second.comparei(string) != 0)
      {
          URHO3D_LOGWARNINGF("StringHash collision detected! Both \"%s\" and \"%s\" have hash #%s",
              string, iter->second.c_str(), hash.ToString().c_str());
      }
  
      if (mutex_)
          mutex_->Release();
  
      return hash;
  }
  
  StringHash StringHashRegister::RegisterString(const char* string)
  {
      StringHash hash(string);
      return RegisterString(hash, string);
  }
  
  ea::string StringHashRegister::GetStringCopy(const StringHash& hash) const
  {
      if (mutex_)
          mutex_->Acquire();
  
      const ea::string copy = GetString(hash);
  
      if (mutex_)
          mutex_->Release();
  
      return copy;
  }
  
  bool StringHashRegister::Contains(const StringHash& hash) const
  {
      if (mutex_)
          mutex_->Acquire();
  
      const bool contains = map_.contains(hash);
  
      if (mutex_)
          mutex_->Release();
  
      return contains;
  }
  
  const ea::string& StringHashRegister::GetString(const StringHash& hash) const
  {
      auto iter = map_.find(hash);
      return iter == map_.end() ? EMPTY_STRING : iter->second;
  }
  
  }
  