MeVisLab/Standard/Sources/ML/MLVesselGraph/Properties/mlPropertyAccessor.h

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// **InsertLicense** code
//----------------------------------------------------------------------------------

//----------------------------------------------------------------------------------

#ifndef __MLPropertyAccessor_H
#define __MLPropertyAccessor_H

#include "mlVesselGraphSystem.h"

#include "mlIntrusivePtrBase.h"
#include "mlPropertyContainer.h"
#include "mlPropertyIndex.h"
#include "mlPropertyManager.h"

#include "mlSystemWarningsDisable.h"
#include <boost/mem_fn.hpp>
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/add_reference.hpp>
#include <boost/type_traits/remove_const.hpp>
#include "mlSystemWarningsRestore.h"


ML_START_NAMESPACE

template<typename T>
class DefaultPropertyAccessor : IntrusivePtrBase<DefaultPropertyAccessor<T> > {
public:
  typedef DefaultPropertyAccessor<T> type;
  typedef boost::intrusive_ptr<type> PointerType;
  typedef boost::intrusive_ptr<const type> ConstPointerType;

  DefaultPropertyAccessor(const PropertyManager::Pointer& manager, const std::string& propertyName, const T& defaultValue) :
      _index(manager, propertyName), _defaultValue(defaultValue) {};

  T& operator()(PropertyContainer& container) const;
  const T& operator()(const PropertyContainer& container) const;

  const T& get(const PropertyContainer& container) const { return operator()(container); }
  void set(PropertyContainer& container, const T& value) const { operator()(container) = value; }

private:
  SmartPropertyIndex _index;
  T _defaultValue;
};

template<typename T>
T& DefaultPropertyAccessor<T>::operator()(PropertyContainer& container) const
{
  if (_index.getManager()!=container.getPropertyManager()) {
    throw ML_BAD_PARAMETER;
  }
  if (!_index.isValid()) {
    container.getPropertyManager()->createProperty(_index.getName(), _defaultValue);
  }
  return container.property<T>(_index);
}

template<typename T>
const T& DefaultPropertyAccessor<T>::operator()(const PropertyContainer& container) const
{
  if (_index.getManager()!=container.getPropertyManager()) {
    throw ML_BAD_PARAMETER;
  }
  if (_index.isValid()) {
    return container.property<T>(_index);
  }
  else {
    return _defaultValue;
  }
}


ML_END_NAMESPACE

#endif // __MLPropertyAccessor_H