Method CreateImageReader2FromExtension

IO/Image/vtkImageReader2Factory.cxx:105–139

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//----------------------------------------------------------------------------
vtkImageReader2* vtkImageReader2Factory::CreateImageReader2FromExtension(const char* extension)
{
  vtkImageReader2Factory::InitializeReaders();
  vtkImageReader2* ret;
  vtkNew<vtkCollection> collection;
  vtkObjectFactory::CreateAllInstance("vtkImageReaderObject", collection);

  // first try the current registered object factories to see
  // if one of them can
  for (collection->InitTraversal(); vtkObject* object = collection->GetNextItemAsObject();)
  {
    ret = vtkImageReader2::SafeDownCast(object);
    if (ret)
    {
      const char* extensions = ret->GetFileExtensions();
      if (vtkImageReader2Factory::CheckExtensionIsInExtensions(extension, extensions))
      {
        return ret;
      }
    }
  }

  // Then try all available readers
  vtkCollectionSimpleIterator sit;
  for (vtkImageReader2Factory::AvailableReaders->InitTraversal(sit);
       (ret = vtkImageReader2Factory::AvailableReaders->GetNextImageReader2(sit));)
  {
    const char* extensions = ret->GetFileExtensions();
    if (vtkImageReader2Factory::CheckExtensionIsInExtensions(extension, extensions))
    {
      return ret->NewInstance();
    }
  }
  return nullptr;
}

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bool vtkImageReader2Factory::CheckExtensionIsInExtensions(