private void createInnerClass(Project project, final Editor editor, PsiElement qualifier) {
        PsiElement resolved = resolveQualifier(qualifier);
        if (!(resolved instanceof PsiClass)) return;

        JVMElementFactory factory = JVMElementFactories.getFactory(resolved.getLanguage(), project);
        if (factory == null) return;

        String name = myRefElement.getReferenceName();
        PsiClass template = createTemplate(factory, name);

        if (template == null) {
          ApplicationManager.getApplication().invokeLater(() -> {
            if (editor != null && editor.getComponent().isDisplayable()) {
              HintManager.getInstance().showErrorHint(editor, GroovyBundle.message("cannot.create.class"));
            }
          });
          return;
        }

        if (!FileModificationService.getInstance().preparePsiElementForWrite(resolved)) return;

        WriteAction.run(() -> {
          PsiClass added = (PsiClass)resolved.add(template);
          PsiModifierList modifierList = added.getModifierList();
          if (modifierList != null) {
            modifierList.setModifierProperty(PsiModifier.STATIC, true);
          }
          IntentionUtils.positionCursor(project, added.getContainingFile(), added);
        });
      }
private void createInnerClass(Project project, final Editor editor, PsiElement qualifier)