private NavigationFormat determineFormat(
List<BaseRoute> routes, NavigationFormat preferredFormat) {
NavigationFormat result = preferredFormat;
for (BaseRoute route : routes) {
// more than one route: the same result
if (result.equals(route.getFormat())) continue;
// result is capable of storing multiple routes
if (result.isSupportsMultipleRoutes()) continue;
// result from GPSBabel-based format which allows only one route but is represented by GPX 1.0
if (result instanceof BabelFormat) continue;
// default for multiple routes is GPX 1.1
result = new Gpx11Format();
}
return result;
}
