mitkVectorPropertySerializer.h

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/*============================================================================
 
The Medical Imaging Interaction Toolkit (MITK)
 
Copyright (c) German Cancer Research Center (DKFZ)
All rights reserved.
 
Use of this source code is governed by a 3-clause BSD license that can be
found in the LICENSE file.
 
============================================================================*/
 
#ifndef mitkVectorPropertySerializer_h
#define mitkVectorPropertySerializer_h
 
#include <mitkBasePropertySerializer.h>
#include <mitkVectorProperty.h>
#include <mitkLexicalCast.h>
#include <tinyxml2.h>
 
namespace mitk
{
  template <typename DATATYPE>
  class MITKSCENESERIALIZATIONBASE_EXPORT VectorPropertySerializer : public BasePropertySerializer
  {
  public:
    // Expand manually most of mitkClassMacro:
    // mitkClassMacro(VectorProperty<DATATYPE>, mitk::BaseProperty);
    // This manual expansion is done to override explicitly
    // the GetNameOfClass methods
    typedef VectorProperty<DATATYPE> PropertyType;
    typedef VectorPropertySerializer<DATATYPE> Self;
    typedef BasePropertySerializer SuperClass;
    typedef itk::SmartPointer<Self> Pointer;
    typedef itk::SmartPointer<const Self> ConstPointer;
    std::vector<std::string> GetClassHierarchy() const override { return mitk::GetClassHierarchy<Self>(); }
    // This function must return different
    // strings in function of the template parameter!
    // Serialization depends on this feature.
    static const char *GetStaticNameOfClass()
    {
      // concatenate a prefix dependent on the template type and our own classname
      static std::string nameOfClass =
        std::string(VectorPropertyDataType<DATATYPE>::prefix()) + "VectorPropertySerializer";
      return nameOfClass.c_str();
    }
 
    const char *GetNameOfClass() const override { return this->GetStaticNameOfClass(); }
    itkFactorylessNewMacro(Self);
    itkCloneMacro(Self);
 
    tinyxml2::XMLElement* Serialize(tinyxml2::XMLDocument& doc) override
    {
      auto *listElement = doc.NewElement("Values");
 
      if (const PropertyType *prop = dynamic_cast<const PropertyType *>(m_Property.GetPointer()))
      {
        typename PropertyType::VectorType elements = prop->GetValue();
        unsigned int index(0);
        for (auto listEntry : elements)
        {
          std::stringstream indexS;
          indexS << index++;
 
          auto *entryElement = doc.NewElement("Value");
          entryElement->SetAttribute("idx", indexS.str().c_str());
          entryElement->SetAttribute("value", boost::lexical_cast<std::string>(listEntry).c_str());
          listElement->InsertEndChild(entryElement);
        }
 
        return listElement;
      }
      else
      {
        return nullptr;
      }
    }
 
    BaseProperty::Pointer Deserialize(const tinyxml2::XMLElement *listElement) override
    {
      typename PropertyType::VectorType datalist;
 
      if (listElement)
      {
        std::string valueString;
        DATATYPE value;
        for (auto *valueElement = listElement->FirstChildElement("Value"); valueElement;
             valueElement = valueElement->NextSiblingElement("Value"))
        {
          valueString = valueElement->Attribute("value");
          if (valueString.empty())
          {
            MITK_ERROR << "Missing value attribute in <Values> list";
            return nullptr;
          }
 
          try
          {
            value = boost::lexical_cast<DATATYPE>(valueString);
          }
          catch (boost::bad_lexical_cast &e)
          {
            MITK_ERROR << "Could not parse '" << valueString << "' as number: " << e.what();
            return nullptr;
          }
 
          datalist.push_back(value);
        }
 
        typename PropertyType::Pointer property = PropertyType::New();
        property->SetValue(datalist);
        return property.GetPointer();
      }
      else
      {
        MITK_ERROR << "Missing <Values> tag.";
      }
 
      return nullptr;
    }
  };
 
  typedef VectorPropertySerializer<double> DoubleVectorPropertySerializer;
  typedef VectorPropertySerializer<int> IntVectorPropertySerializer;
 
} // namespace
 
#endif