public DirectionsApiRequest origin(String origin) {
    return param("origin", origin);
  }
The address or textual latitude/longitude value from which you wish to calculate directions. If
you pass an address as a location, the Directions service will geocode the location and convert
it to a latitude/longitude coordinate to calculate directions. If you pass coordinates, ensure
that no space exists between the latitude and longitude values.

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