public static @Nullable String convertToString(final PsiType psiType) {
    if (psiType instanceof PsiArrayType) {
      return '[' + toStringArray(((PsiArrayType)psiType).getComponentType());
    }
    else if (psiType instanceof PsiClassType) {
      return psiType.getCanonicalText();
    }
    return null;
  }
public static @Nullable String convertToString(final PsiType psiType)