text: /*
  Open Asset Import Library (assimp)
  ----------------------------------------------------------------------
  
  Copyright (c) 2006-2021, assimp team
  
  
  All rights reserved.
  
  Redistribution and use of this software in source and binary forms,
  with or without modification, are permitted provided that the
  following conditions are met:
  
  * Redistributions of source code must retain the above
    copyright notice, this list of conditions and the
    following disclaimer.
  
  * Redistributions in binary form must reproduce the above
    copyright notice, this list of conditions and the
    following disclaimer in the documentation and/or other
    materials provided with the distribution.
  
  * Neither the name of the assimp team, nor the names of its
    contributors may be used to endorse or promote products
    derived from this software without specific prior
    written permission of the assimp team.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  ----------------------------------------------------------------------
  */
  
  /** @file  FBXProperties.h
   *  @brief FBX dynamic properties
   */
  #ifndef INCLUDED_AI_FBX_PROPERTIES_H
  #define INCLUDED_AI_FBX_PROPERTIES_H
  
  #include "FBXCompileConfig.h"
  #include <memory>
  #include <string>
  
  namespace Assimp {
  namespace FBX {
  
  // Forward declarations
  class Element;
  
  /** Represents a dynamic property. Type info added by deriving classes,
   *  see #TypedProperty.
   Example:
   @verbatim
     P: "ShininessExponent", "double", "Number", "",0.5
   @endvebatim
  */
  class Property {
  protected:
      Property();
  
  public:
      virtual ~Property();
  
  public:
      template <typename T>
      const T* As() const {
          return dynamic_cast<const T*>(this);
      }
  };
  
  template<typename T>
  class TypedProperty : public Property {
  public:
      explicit TypedProperty(const T& value)
      : value(value) {
          // empty
      }
  
      const T& Value() const {
          return value;
      }
  
  private:
      T value;
  };
  
  
  typedef std::fbx_unordered_map<std::string,std::shared_ptr<Property> > DirectPropertyMap;
  typedef std::fbx_unordered_map<std::string,const Property*>            PropertyMap;
  typedef std::fbx_unordered_map<std::string,const Element*>             LazyPropertyMap;
  
  /**
   *  Represents a property table as can be found in the newer FBX files (Properties60, Properties70)
   */
  class PropertyTable {
  public:
      // in-memory property table with no source element
      PropertyTable();
      PropertyTable(const Element& element, std::shared_ptr<const PropertyTable> templateProps);
      ~PropertyTable();
  
      const Property* Get(const std::string& name) const;
  
      // PropertyTable's need not be coupled with FBX elements so this can be nullptr
      const Element* GetElement() const {
          return element;
      }
  
      const PropertyTable* TemplateProps() const {
          return templateProps.get();
      }
  
      DirectPropertyMap GetUnparsedProperties() const;
  
  private:
      LazyPropertyMap lazyProps;
      mutable PropertyMap props;
      const std::shared_ptr<const PropertyTable> templateProps;
      const Element* const element;
  };
  
  // ------------------------------------------------------------------------------------------------
  template <typename T>
  inline
  T PropertyGet(const PropertyTable& in, const std::string& name, const T& defaultValue) {
      const Property* const prop = in.Get(name);
      if( nullptr == prop) {
          return defaultValue;
      }
  
      // strong typing, no need to be lenient
      const TypedProperty<T>* const tprop = prop->As< TypedProperty<T> >();
      if( nullptr == tprop) {
          return defaultValue;
      }
  
      return tprop->Value();
  }
  
  // ------------------------------------------------------------------------------------------------
  template <typename T>
  inline
  T PropertyGet(const PropertyTable& in, const std::string& name, bool& result, bool useTemplate=false ) {
      const Property* prop = in.Get(name);
      if( nullptr == prop) {
          if ( ! useTemplate ) {
              result = false;
              return T();
          }
          const PropertyTable* templ = in.TemplateProps();
          if ( nullptr == templ ) {
              result = false;
              return T();
          }
          prop = templ->Get(name);
          if ( nullptr == prop ) {
              result = false;
              return T();
          }
      }
  
      // strong typing, no need to be lenient
      const TypedProperty<T>* const tprop = prop->As< TypedProperty<T> >();
      if( nullptr == tprop) {
          result = false;
          return T();
      }
  
      result = true;
      return tprop->Value();
  }
  
  } //! FBX
  } //! Assimp
  
  #endif // INCLUDED_AI_FBX_PROPERTIES_H
  