public boolean protocolConnect()

in geronimo-mail_2.1_impl/geronimo-mail_2.1_provider/src/main/java/org/apache/geronimo/mail/store/pop3/connection/POP3Connection.java [100:155]
40 lines of code
14 McCabe index (conditional complexity)

    public boolean protocolConnect(String host, int port, String authid, String realm, String username, String password) throws MessagingException {
        this.serverHost = host;
        this.serverPort = port;
        this.realm = realm;
        this.authid = authid;
        this.username = username;
        this.password = password;

        try {
            // create socket and connect to server.
            getConnection();
            // consume the welcome line
            getWelcome();
            
            // if we're not already using an SSL connection, and we have permission to issue STARTTLS or its even required
            // try to setup a SSL connection
            if (!sslConnection && (useTLS || requireTLS)) {
                
                    // tell the server of our intention to start a TLS session
                    POP3Response starttlsResponse = null;
                    try {
                        starttlsResponse = sendCommand("STLS");
                    } catch (CommandFailedException e) {
                       
                    }
                    
                    //if the server does not support TLS check if its required.
                    //If true then throw an error, if not establish a non SSL connection
                    if(requireTLS && (starttlsResponse == null || starttlsResponse.isError())) {
                        throw new MessagingException("Server doesn't support required transport level security");
                    } else if(starttlsResponse != null && starttlsResponse.getStatus() == POP3Response.OK) {
                     // The connection is then handled by the superclass level.
                        getConnectedTLSSocket();
                    } else {
                        if (debug) {
                            debugOut("STARTTLS is enabled but not required and server does not support it. So we establish a connection without transport level security");
                        }
                    }
            }
            
            getConnection();
            
            // go login with the server
            if (login())
            {
                loggedIn = true;
                return true;
            }
            return false;
        } catch (IOException e) {
            if (debug) {
                debugOut("I/O exception establishing connection", e);
            }
            throw new MessagingException("Connection error", e);
        }
    }