Method parseNanos

core/src/main/java/io/grpc/internal/JsonUtil.java:345–357

Copy of com.google.protobuf.util.Timestamps#parseNanos.

(String value)

   * Copy of {@link com.google.protobuf.util.Timestamps#parseNanos}.
   */
  private static int parseNanos(String value) throws ParseException {
    int result = 0;
    for (int i = 0; i < 9; ++i) {
      result = result * 10;
      if (i < value.length()) {
        if (value.charAt(i) < '0' || value.charAt(i) > '9') {
          throw new ParseException("Invalid nanoseconds.", 0);
        }
        result += value.charAt(i) - '0';
      }
    }
    return result;
  }

  private static final int NANOS_PER_SECOND = 1_000_000_000;