@SuppressWarnings({"unchecked"})
  public @Nullable T generate(final @Nullable DomElement parent, final Editor editor) {
    if (parent == null) {
      return null;
    }

    final List<? extends DomCollectionChildDescription> list = parent.getGenericInfo().getCollectionChildrenDescriptions();

    for (DomCollectionChildDescription childDescription : list) {
      if (ClassUtil.getRawType(childDescription.getType()).isAssignableFrom(myChildElementClass)) {
        XmlTag parentTag = parent.getXmlTag();
        if (editor != null && parentTag != null) {
          int offset = editor.getCaretModel().getOffset();
          PsiFile file = parentTag.getContainingFile();
          PsiElement psiElement = file.findElementAt(offset);

          if (psiElement instanceof PsiWhiteSpace && PsiTreeUtil.isAncestor(parentTag, psiElement, false)) {
              Document document = editor.getDocument();
            XmlTag childTag = parentTag.createChildTag(childDescription.getXmlElementName(), null, null, true);
            String text = childTag.getText();
            document.insertString(offset, text);
            Project project = editor.getProject();
            assert project != null;
            PsiDocumentManager documentManager = PsiDocumentManager.getInstance(project);
            documentManager.commitDocument(document);
            PsiElement element = file.findElementAt(offset + 1);
            T domElement = DomUtil.findDomElement(element, myChildElementClass);
            if (domElement != null) return domElement;
            document.deleteString(offset, offset + text.length());
            documentManager.commitDocument(document);
          }
        }

        int index = getCollectionIndex(parent, childDescription, editor);

        return index < 0
               ? (T)childDescription.addValue(parent, myChildElementClass)
               : (T)childDescription.addValue(parent, myChildElementClass, index);
      }
    }
    return null;
  }
@SuppressWarnings({"unchecked"})
  public @Nullable T generate(final @Nullable DomElement parent, final Editor editor)