Method writeXml

plugins/e57/libE57Format/src/StructureNodeImpl.cpp:381–450

??? use visitor?

//??? use visitor?
void StructureNodeImpl::writeXml( ImageFileImplSharedPtr imf, CheckedFile &cf, int indent,
                                  const char *forcedFieldName )
{
   // don't checkImageFileOpen

   ustring fieldName;
   if ( forcedFieldName != nullptr )
   {
      fieldName = forcedFieldName;
   }
   else
   {
      fieldName = elementName_;
   }

   cf << space( indent ) << "<" << fieldName << " type=\"Structure\"";

   const int numSpaces = indent + static_cast<int>( fieldName.length() ) + 2;

   // If this struct is the root for the E57 file, add name space declarations. Note the prototype
   // of a CompressedVector is a separate tree, so don't want to write out namespaces if not the
   // ImageFile root
   if ( isRoot() && shared_from_this() == imf->root() )
   {
      bool gotDefaultNamespace = false;
      for ( size_t i = 0; i < imf->extensionsCount(); i++ )
      {
         const char *xmlnsExtension;
         if ( imf->extensionsPrefix( i ).empty() )
         {
            gotDefaultNamespace = true;
            xmlnsExtension = "xmlns";
         }
         else
         {
            xmlnsExtension = "xmlns:";
         }

         const int index = static_cast<int>( i );

         cf << "\n"
            << space( numSpaces ) << xmlnsExtension << imf->extensionsPrefix( index ) << "=\""
            << imf->extensionsUri( index ) << "\"";
      }

      // If user didn't explicitly declare a default namespace, use the current E57 standard one.
      if ( !gotDefaultNamespace )
      {
         cf << "\n" << space( numSpaces ) << "xmlns=\"" << VERSION_1_0_URI << "\"";
      }
   }
   if ( !children_.empty() )
   {
      cf << ">\n";

      // Write all children nested inside Structure element
      for ( auto &child : children_ )
      {