kaansonmezoz

public List<Trip> getTripsByUser(User user) throws UserNotLoggedInException {
    User loggedUser = UserSession.getInstance().getLoggedUser();

    if(loggedUser == null){
        throw new UserNotLoggedInException();
    }

    return isFriend(user.getFriends(), loggedUser) ?
          TripDAO.findTripsByUser(user) : new ArrayList<Trip>();
}

kaansonmezoz

public List<Trip> getTripsByUser(User user) throws UserNotLoggedInException {
    User loggedUser = UserSession.getInstance().getLoggedUser();

    if(loggedUser == null){
        throw new UserNotLoggedInException();
    }
    
    List<Trip> tripList = new ArrayList<Trip>();
    boolean isFriend = isFriendOf(user, loggedUser);
  

kaansonmezoz

private boolean isFriendOf(User user, User loggedUser) {
    for (User friend: user.getFriends()) {
        if (friend.equals(loggedUser)) {
            return true;
        }
    }

    return false;
}

kaansonmezoz

public List<Trip> getTripsByUser(User user) throws UserNotLoggedInException {
    User loggedUser = UserSession.getInstance().getLoggedUser();

    if(loggedUser == null){
        throw new UserNotLoggedInException();
    }
    
    List<Trip> tripList = new ArrayList<Trip>();
    boolean isFriend = false;

kaansonmezoz

public List<Trip> getTripsByUser(User user) throws UserNotLoggedInException {
    List<Trip> tripList = new ArrayList<Trip>();
    User loggedUser = UserSession.getInstance().getLoggedUser();
    boolean isFriend = false;
    if (loggedUser != null) {
        for (User friend : user.getFriends()) {
            if (friend.equals(loggedUser)) {
                isFriend = true;
                break;
            }

kaansonmezoz

@Service
public class FileReaderFactory {
    private EnumMap<FileType, FileReader> fileReaders;

    public FileReaderFactory(List<FileReader> fileReaderList){
        fileReaders = new EnumMap<>(FileType.class);
        fileReaderList.forEach(reader -> fileReaders.put(reader.getSupportedFileType(), reader));
    }

    public FileReader getFileReader(String extension){

kaansonmezoz

@Service
public class CsvReader extends FileReader {

    public CsvReader(){
        super(FileType.CSV);
    }

    @Override
    public void readFile(String filePath) {
        System.out.println(String.format("CsvReader --> Reading file: %s", filePath));

kaansonmezoz

public enum FileType {
    CSV("csv"),
    EXCEL("xlsx"),
    PDF("pdf");

    FileType(String extension){
        this.extension = extension;
    }

    private String extension;

kaansonmezoz

public class FileOperations {
  private FileReaderFactory readerFactory;
  
  // some code here
  
  public String readFile(String filePath){
    return readerFactory.createFileReader(filePath).readFile(FilePath);
  }
}

kaansonmezoz

public class CsvReader implements FileReader {
  // some code here
  
  public String readFile(String filePath) {
    // ...
    
    return fileContent;
  }

}