CODEWITHSUNDEEP
javalambda
k_rollo
k_rollo

Reputation: 5472

Return matched element in a List using lambdas

This works well and all:

// ActorDao
public Optional<Actor> read(long id) {
    return Optional.ofNullable(actors.get((int) id));
}

public List<Actor> readAll() {
    // Return a list of actors from db  
}



// Demo
public static Actor getActor(String firstName, String lastName) {
    Dao<Actor> actorDao = new ActorDao();
    long id = 0;
    for (Actor actor : actorDao.readAll()) {
        if (firstName.equalsIgnoreCase(actor.getFirstName()) && lastName.equalsIgnoreCase(actor.getLastName())) {
            id = actor.getId() - 1; // actor_id in db starts at 1
            return actorDao.read(id).get();
        }
    }
    return null;
}

What would be the more elegant way in Java8+?

Upvotes: 0

Views: 49

Answers (1)

shmosel
shmosel

Reputation: 50756

return actorDao.readAll()
        .stream()
        .filter(actor -> firstName.equalsIgnoreCase(actor.getFirstName()))
        .filter(actor -> lastName.equalsIgnoreCase(actor.getLastName()))
        .map(actor -> actorDao.read(actor.getId() - 1).get())
        .findFirst()
        .orElse(null);

Upvotes: 1

Related Questions