@NotNull
  protected static PsiType getKeyType(PsiType psiFieldType, PsiManager psiManager) {
    return PsiTypeUtil.extractOneElementType(psiFieldType, psiManager, CommonClassNames.JAVA_UTIL_MAP, 0);
  }
@NotNull
  protected static PsiType getKeyType(PsiType psiFieldType, PsiManager psiManager)