/**
* Copyright (C) 2013 - 2015 the enviroCar community
* <p>
* This file is part of the enviroCar app.
* <p>
* The enviroCar app is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* <p>
* The enviroCar app is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
* <p>
* You should have received a copy of the GNU General Public License along
* with the enviroCar app. If not, see http://www.gnu.org/licenses/.
*/
package org.envirocar.remote.dao;
import org.envirocar.core.dao.CarDAO;
import org.envirocar.core.entity.Car;
import org.envirocar.core.entity.User;
import org.envirocar.core.exception.DataCreationFailureException;
import org.envirocar.core.exception.DataRetrievalFailureException;
import org.envirocar.core.exception.NotConnectedException;
import org.envirocar.core.exception.ResourceConflictException;
import org.envirocar.core.exception.UnauthorizedException;
import org.envirocar.core.logging.Logger;
import org.envirocar.remote.service.CarService;
import org.envirocar.remote.service.EnviroCarService;
import org.envirocar.remote.util.EnvirocarServiceUtils;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import javax.inject.Inject;
import retrofit.Call;
import retrofit.Response;
import rx.Observable;
import rx.Subscriber;
import rx.functions.Func1;
/**
* TODO JavaDoc
*
* @author dewall
*/
public class RemoteCarDAO extends BaseRemoteDAO<CarDAO, CarService> implements CarDAO {
private static final Logger LOG = Logger.getLogger(RemoteCarDAO.class);
/**
* Constructor.
*
* @param cacheDao cache dao for accessing local cars.
*/
@Inject
public RemoteCarDAO(CacheCarDAO cacheDao, CarService service) {
super(cacheDao, service);
}
@Override
public List<Car> getAllCars() throws NotConnectedException, DataRetrievalFailureException {
return getAllCars(1);
}
/**
* @param page the page to request (limit of cars per page is set to 100)
* @return
* @throws DataRetrievalFailureException
*/
private List<Car> getAllCars(int page) throws DataRetrievalFailureException {
Call<List<Car>> carsCall = remoteService.getAllCars(page);
try {
Response<List<Car>> carsResponse = carsCall.execute();
List<Car> result = carsResponse.body();
// Check whether this request was not the last page.
boolean hasNextPage = EnvirocarServiceUtils.hasNextPage(carsResponse);
// if this is not the last page, then recursively call the method to get
// all sensor values of the next pages.
if (hasNextPage) {
result.addAll(getAllCars(page + 1));
}
return result;
} catch (IOException e) {
throw new DataRetrievalFailureException(e);
}
}
@Override
public Observable<List<Car>> getAllCarsObservable() {
return getAllCarsObservable(1);
}
@Override
public List<Car> getCarsByUser(User user) throws UnauthorizedException,
NotConnectedException, DataRetrievalFailureException {
LOG.info(String.format("getCarsByUser(%s)", user.getUsername()));
Call<List<Car>> carsCall = remoteService.getAllCars(user.getUsername());
try{
Response<List<Car>> carsResponse = executeCall(carsCall);
return carsResponse.body();
} catch (IOException | ResourceConflictException e) {
throw new DataRetrievalFailureException(e);
}
}
@Override
public Observable<List<Car>> getCarsByUserObservable(User user) {
LOG.info(String.format("getCarsByUserObservable(%s)", user.getUsername()));
return Observable.create(new Observable.OnSubscribe<List<Car>>() {
@Override
public void call(Subscriber<? super List<Car>> subscriber) {
LOG.info("call:");
try {
subscriber.onStart();
subscriber.onNext(getCarsByUser(user));
} catch (UnauthorizedException |
NotConnectedException |
DataRetrievalFailureException e){
subscriber.onError(e);
}
subscriber.onCompleted();
}
});
}
@Override
public String createCar(Car car) throws NotConnectedException, DataCreationFailureException,
UnauthorizedException {
try {
Response<Car> createCarResponse = executeCall(remoteService.createCar(car));
// Get all headers in order to find out the location of the uploaded car.
Map<String, List<String>> headerListMap = createCarResponse.headers().toMultimap();
// Get the header of the location
String location = "";
if (headerListMap.containsKey("Location")) {
for (String locationHeader : headerListMap.get("Location")) {
location += locationHeader;
}
}
LOG.info("location: " + location);
// Return the remote location of the header
return location.substring(location.lastIndexOf("/") + 1, location.length());
} catch (IOException e) {
throw new NotConnectedException(e);
} catch (ResourceConflictException e) {
throw new DataCreationFailureException(e);
}
}
@Override
public Observable<Car> createCarObservable(final Car car) {
return Observable.create(new Observable.OnSubscribe<Car>() {
@Override
public void call(Subscriber<? super Car> subscriber) {
try {
String location = createCar(car);
LOG.info("Car has been uploaded -> [" + location + "]");
car.setId(location);
subscriber.onNext(car);
} catch (DataCreationFailureException |
NotConnectedException |
UnauthorizedException e) {
subscriber.onError(e);
}
subscriber.onCompleted();
}
});
}
/**
* This method recursively calls the enviroCar remoteService until each page has been requested.
*
* @param page the page to request the data from.
* @return an observable stream of data.
*/
private Observable<List<Car>> getAllCarsObservable(final int page) {
final CarService carService = EnviroCarService.getCarService();
Call<List<Car>> carsCall = carService.getAllCars(page);
// return an observeable that returns a list of cars for every 100 cars.
return Observable.just(carsCall)
.concatMap(new Func1<Call<List<Car>>, Observable<? extends List<Car>>>() {
@Override
public Observable<? extends List<Car>> call(Call<List<Car>> listCall) {
try {
// Execute the call.
Response<List<Car>> response = listCall.execute();
Observable<List<Car>> res = Observable.just(response.body());
// Search for "rel=last". If this exists, then this was not the last
// page.
if (EnvirocarServiceUtils.hasNextPage(response)) {
// If this is not the last page, then recursively concatenate with
// other observables.
res = res.concatWith(getAllCarsObservable(page + 1));
}
return res;
} catch (IOException e) {
// Return an error observable that invokes the observers onError method.
return Observable.error(new DataRetrievalFailureException(e));
}
}
});
}
}