public Observable<Optional<Station>> getStationByGaugeId(final String gaugeId) {
if (!stationCache.getStations().isPresent()) {
return getStations()
.flatMap(
new Func1<Collection<Station>, Observable<Optional<Station>>>() {
@Override
public Observable<Optional<Station>> call(Collection<Station> stations) {
return Observable.just(
Optional.of(stationCache.getStations().get().get(gaugeId)));
}
});
} else {
return Observable.just(Optional.of(stationCache.getStations().get().get(gaugeId)));
}
}
public Observable<List<Station>> getStations() {
if (stationCache.getStations().isPresent()) {
return Observable.just(sortStations(stationCache.getStations().get().values()));
} else {
return Observable.defer(
new Func0<Observable<List<Station>>>() {
@Override
public Observable<List<Station>> call() {
// download stations
Map<String, List<Station.Builder>> builderMap = new HashMap<>();
String startId = null;
Data data;
do {
// iterate over ODS cursor
data =
dataApi.getObjectsSynchronously(
PEGEL_ALARM_SOURCE_ID, startId, QUERY_COUNT, PROPERTY_FILTER_STATION);
for (JsonNode node : data.getResult()) {
Pair<String, Station.Builder> pair = parseStation(node);
List<Station.Builder> stationsList = builderMap.get(pair.first);
if (stationsList == null) {
stationsList = new ArrayList<>();
builderMap.put(pair.first, stationsList);
}
stationsList.add(pair.second);
}
startId = data.getCursor().getNext();
} while (data.getCursor().getHasNext());
// count stations per water and build stations
Map<String, Station> stations = new HashMap<>();
for (String waterName : builderMap.keySet()) {
BodyOfWater water = new BodyOfWater(waterName, builderMap.get(waterName).size());
for (Station.Builder builder : builderMap.get(waterName)) {
Station station = builder.setBodyOfWater(water).build();
stations.put(station.getGaugeId(), station);
}
}
stationCache.setStations(stations);
return Observable.just(sortStations(stations.values()));
}
});
}
}