public DirectionsApiRequest originPlaceId(String originPlaceId) {
    return param("origin", prefixPlaceId(originPlaceId));
  }
The Place ID value from which you wish to calculate directions.

@param originPlaceId The starting location Place ID for the Directions request.
@return Returns this {@code DirectionsApiRequest} for call chaining.
src/main/java/com/google/maps/DirectionsApiRequest.java