@Override
 public Map<String, Set<RefEntity>> getOldContent() {
   if (myOldProblemElements == null) return null;
   final Map<String, Set<RefEntity>> oldContents =
       new com.intellij.util.containers.HashMap<String, Set<RefEntity>>();
   final Set<RefEntity> elements = myOldProblemElements.keySet();
   for (RefEntity element : elements) {
     String groupName =
         element instanceof RefElement
             ? element.getRefManager().getGroupName((RefElement) element)
             : element.getName();
     final Set<RefEntity> collection = myContents.get(groupName);
     if (collection != null) {
       final Set<RefEntity> currentElements = new HashSet<RefEntity>(collection);
       if (RefUtil.contains(element, currentElements)) continue;
     }
     Set<RefEntity> oldContent = oldContents.get(groupName);
     if (oldContent == null) {
       oldContent = new HashSet<RefEntity>();
       oldContents.put(groupName, oldContent);
     }
     oldContent.add(element);
   }
   return oldContents;
 }
  private void exportResults(
      @NotNull final CommonProblemDescriptor[] descriptors,
      @NotNull RefEntity refEntity,
      @NotNull Element parentNode) {
    for (CommonProblemDescriptor descriptor : descriptors) {
      @NonNls final String template = descriptor.getDescriptionTemplate();
      int line =
          descriptor instanceof ProblemDescriptor
              ? ((ProblemDescriptor) descriptor).getLineNumber()
              : -1;
      final PsiElement psiElement =
          descriptor instanceof ProblemDescriptor
              ? ((ProblemDescriptor) descriptor).getPsiElement()
              : null;
      @NonNls
      String problemText =
          StringUtil.replace(
              StringUtil.replace(
                  template,
                  "#ref",
                  psiElement != null
                      ? ProblemDescriptorUtil.extractHighlightedText(descriptor, psiElement)
                      : ""),
              " #loc ",
              " ");

      Element element = refEntity.getRefManager().export(refEntity, parentNode, line);
      if (element == null) return;
      @NonNls
      Element problemClassElement =
          new Element(InspectionsBundle.message("inspection.export.results.problem.element.tag"));
      problemClassElement.addContent(myToolWrapper.getDisplayName());

      final HighlightSeverity severity;
      if (refEntity instanceof RefElement) {
        final RefElement refElement = (RefElement) refEntity;
        severity = getSeverity(refElement);
      } else {
        final InspectionProfile profile =
            InspectionProjectProfileManager.getInstance(getContext().getProject())
                .getInspectionProfile();
        final HighlightDisplayLevel level =
            profile.getErrorLevel(
                HighlightDisplayKey.find(myToolWrapper.getShortName()), psiElement);
        severity = level.getSeverity();
      }

      if (severity != null) {
        ProblemHighlightType problemHighlightType =
            descriptor instanceof ProblemDescriptor
                ? ((ProblemDescriptor) descriptor).getHighlightType()
                : ProblemHighlightType.GENERIC_ERROR_OR_WARNING;
        final String attributeKey =
            getTextAttributeKey(getRefManager().getProject(), severity, problemHighlightType);
        problemClassElement.setAttribute("severity", severity.myName);
        problemClassElement.setAttribute("attribute_key", attributeKey);
      }

      element.addContent(problemClassElement);
      if (myToolWrapper instanceof GlobalInspectionToolWrapper) {
        final GlobalInspectionTool globalInspectionTool =
            ((GlobalInspectionToolWrapper) myToolWrapper).getTool();
        final QuickFix[] fixes = descriptor.getFixes();
        if (fixes != null) {
          @NonNls Element hintsElement = new Element("hints");
          for (QuickFix fix : fixes) {
            final String hint = globalInspectionTool.getHint(fix);
            if (hint != null) {
              @NonNls Element hintElement = new Element("hint");
              hintElement.setAttribute("value", hint);
              hintsElement.addContent(hintElement);
            }
          }
          element.addContent(hintsElement);
        }
      }
      try {
        Element descriptionElement =
            new Element(InspectionsBundle.message("inspection.export.results.description.tag"));
        descriptionElement.addContent(problemText);
        element.addContent(descriptionElement);
      } catch (IllegalDataException e) {
        //noinspection HardCodedStringLiteral,UseOfSystemOutOrSystemErr
        System.out.println(
            "Cannot save results for "
                + refEntity.getName()
                + ", inspection which caused problem: "
                + myToolWrapper.getShortName());
      }
    }
  }