static boolean isUtf8Charset(PsiExpression expression) {
    expression = PsiUtil.skipParenthesizedExprDown(expression);
    if (expression instanceof PsiReferenceExpression ref) {
      if (!"UTF_8".equals(ref.getReferenceName())) {
        return false;
      }
      PsiField target = tryCast(ref.resolve(), PsiField.class);
      return target != null &&
             target.getContainingClass() != null &&
             "java.nio.charset.StandardCharsets".equals(target.getContainingClass().getQualifiedName());
    }
    if (expression instanceof PsiMethodCallExpression && CHARSET_FOR_NAME.test((PsiMethodCallExpression)expression)) {
      PsiExpression arg = ((PsiMethodCallExpression)expression).getArgumentList().getExpressions()[0];
      Object value = ExpressionUtils.computeConstantExpression(arg);
      return value instanceof String && ((String)value).equalsIgnoreCase("utf-8");
    }
    return false;
  }
static boolean isUtf8Charset(PsiExpression expression)