//
// CHALLENGE (work in pairs):
// Move from f(o) -> o.f() and sure that the code is CQS compliant.
//


// 1
class CsvFile<T extends Lines>{
    public CsvFile(Path path){
    ...
    }
    Collection<T> lines();
}

// 2
interface Ping {
    void send();
}


// 3
interface TcpSocket {
    Stream<Byte> stream();
}

// 4
// Iovation - a company that maintains a blacklist of email addresses and corresponding IPs
interface Blacklist {
    boolean contains(WebsiteVisitor websiteVisitor);
}

WebsiteVisitor {
    String email();
    String ipAddress();
}

// 5
//interface AnonymousUserAuthenticator {
//    Token authenticate(String username, String password) throws WrongAuthenticationCredentialsProvided;
//}

Authentication{
    private String name;
    private String password;
    Authentication(String name, String password){...}
    public boolean authenticate() throws WrongAuthenticationCredentialsProvided;
    public Token token();
}


// 6
interface Test {
    interface Result {
        void print();
    }
    boolean hasFinished();
    Collection<Result> getResults();
}

if (test.hasFinished()) {
    for (Result result : test.getResults()) {
        result.prettyPrint();
    }
}


// 7
boolean destroyButtonPresent =
    widgets
        .stream()
        .filter(Widget::isButton)
        .map(button::label)
        .anyMatch("Destroy The World"::equals);

// 8
interface File {
     void open(); // test instead of throws FileNotFound
}