text: /*
  -----------------------------------------------------------------------------
  This source file is part of OGRE
      (Object-oriented Graphics Rendering Engine)
  For the latest info, see http://www.ogre3d.org/
  
  Copyright (c) 2000-2011 Torus Knot Software Ltd
  
  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 "OgreStableHeaders.h"
  #include "OgreLodStrategyManager.h"
  
  #include "OgreException.h"
  #include "OgreDistanceLodStrategy.h"
  #include "OgrePixelCountLodStrategy.h"
  
  namespace Ogre {
      //-----------------------------------------------------------------------
      template<> LodStrategyManager* Singleton<LodStrategyManager>::msSingleton = 0;
      LodStrategyManager* LodStrategyManager::getSingletonPtr(void)
      {
          return msSingleton;
      }
      LodStrategyManager& LodStrategyManager::getSingleton(void)
      {
          assert( msSingleton );  return ( *msSingleton );
      }
      //-----------------------------------------------------------------------
      LodStrategyManager::LodStrategyManager()
      {
          // Add default (distance) strategy
          LodStrategy *distanceStrategy = OGRE_NEW DistanceLodStrategy();
          addStrategy(distanceStrategy);
  
          // Add new pixel-count strategy
          LodStrategy *pixelCountStrategy = OGRE_NEW PixelCountLodStrategy();
          addStrategy(pixelCountStrategy);
  
          // Set the default strategy
          setDefaultStrategy(distanceStrategy);
      }
      //-----------------------------------------------------------------------
      LodStrategyManager::~LodStrategyManager()
      {
          // Destroy all strategies and clear the map
          removeAllStrategies();
      }
      //-----------------------------------------------------------------------
      void LodStrategyManager::addStrategy(LodStrategy *strategy)
      {
          // Check for invalid strategy name
          if (strategy->getName() == "default")
              OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Lod strategy name must not be \"default\".", "LodStrategyManager::addStrategy");
  
          // Insert the strategy into the map with its name as the key
          mStrategies.insert(std::make_pair(strategy->getName(), strategy));
      }
      //-----------------------------------------------------------------------
      LodStrategy *LodStrategyManager::removeStrategy(const String& name)
      {
          // Find strategy with specified name
          StrategyMap::iterator it = mStrategies.find(name);
  
          // If not found, return null
          if (it == mStrategies.end())
              return 0;
  
          // Otherwise, erase the strategy from the map
          mStrategies.erase(it);
  
          // Return the strategy that was removed
          return it->second;
      }
      //-----------------------------------------------------------------------
      void LodStrategyManager::removeAllStrategies()
      {
          // Get beginning iterator
          for (StrategyMap::iterator it = mStrategies.begin(); it != mStrategies.end(); ++it)
  		{
  			OGRE_DELETE it->second;
  		}
  		mStrategies.clear();
  
      }
      //-----------------------------------------------------------------------
      LodStrategy *LodStrategyManager::getStrategy(const String& name)
      {
          // If name is "default", return the default strategy instead of performing a lookup
          if (name == "default")
              return getDefaultStrategy();
  
          // Find strategy with specified name
          StrategyMap::iterator it = mStrategies.find(name);
  
          // If not found, return null
          if (it == mStrategies.end())
              return 0;
  
          // Otherwise, return the strategy
          return it->second;
      }
      //-----------------------------------------------------------------------
      void LodStrategyManager::setDefaultStrategy(LodStrategy *strategy)
      {
          mDefaultStrategy = strategy;
      }
      //-----------------------------------------------------------------------
      void LodStrategyManager::setDefaultStrategy(const String& name)
      {
          // Lookup by name and set default strategy
          setDefaultStrategy(getStrategy(name));
      }
      //-----------------------------------------------------------------------
      LodStrategy *LodStrategyManager::getDefaultStrategy()
      {
          return mDefaultStrategy;
      }
      //-----------------------------------------------------------------------
      MapIterator<LodStrategyManager::StrategyMap> LodStrategyManager::getIterator()
      {
          // Construct map iterator from strategy map and return
          return MapIterator<StrategyMap>(mStrategies);
      }
      //-----------------------------------------------------------------------
  
  }
  