@Override
  public Element export(
      @NotNull RefEntity refEntity, @NotNull final Element element, final int actualLine) {
    refEntity = getRefinedElement(refEntity);

    Element problem = new Element("problem");

    if (refEntity instanceof RefElement) {
      final RefElement refElement = (RefElement) refEntity;
      final SmartPsiElementPointer pointer = refElement.getPointer();
      PsiFile psiFile = pointer.getContainingFile();
      if (psiFile == null) return null;

      Element fileElement = new Element("file");
      Element lineElement = new Element("line");
      final VirtualFile virtualFile = psiFile.getVirtualFile();
      LOG.assertTrue(virtualFile != null);
      fileElement.addContent(virtualFile.getUrl());

      if (actualLine == -1) {
        final Document document =
            PsiDocumentManager.getInstance(pointer.getProject()).getDocument(psiFile);
        LOG.assertTrue(document != null);
        final Segment range = pointer.getRange();
        lineElement.addContent(
            String.valueOf(
                range != null ? document.getLineNumber(range.getStartOffset()) + 1 : -1));
      } else {
        lineElement.addContent(String.valueOf(actualLine));
      }

      problem.addContent(fileElement);
      problem.addContent(lineElement);

      appendModule(problem, refElement.getModule());
    } else if (refEntity instanceof RefModule) {
      final RefModule refModule = (RefModule) refEntity;
      final VirtualFile moduleFile = refModule.getModule().getModuleFile();
      final Element fileElement = new Element("file");
      fileElement.addContent(moduleFile != null ? moduleFile.getUrl() : refEntity.getName());
      problem.addContent(fileElement);
      appendModule(problem, refModule);
    }

    for (RefManagerExtension extension : myExtensions.values()) {
      extension.export(refEntity, problem);
    }

    new SmartRefElementPointerImpl(refEntity, true).writeExternal(problem);
    element.addContent(problem);
    return problem;
  }
 @Override
 public void iterate(@NotNull RefVisitor visitor) {
   for (RefElement refElement : getSortedElements()) {
     refElement.accept(visitor);
   }
   if (myModules != null) {
     for (RefModule refModule : myModules.values()) {
       refModule.accept(visitor);
     }
   }
   for (RefManagerExtension extension : myExtensions.values()) {
     extension.iterate(visitor);
   }
 }
 private static void appendModule(final Element problem, final RefModule refModule) {
   if (refModule != null) {
     Element moduleElement = new Element("module");
     moduleElement.addContent(refModule.getName());
     problem.addContent(moduleElement);
   }
 }