import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.util.Arrays;

public class VoteMulticastReceiver {

  public static void main(String[] args) throws IOException {

    if (args.length != 2) { // Test for correct # of args
      throw new IllegalArgumentException("Parameter(s): <Multicast Addr> <Port>");
    }

    InetAddress address = InetAddress.getByName(args[0]); // Multicast address
    if (!address.isMulticastAddress()) { // Test if multicast address
      throw new IllegalArgumentException("Not a multicast address");
    }

    int port = Integer.parseInt(args[1]); // Multicast port
    MulticastSocket sock = new MulticastSocket(port); // for receiving
    sock.joinGroup(address); // Join the multicast group

    VoteMsgTextCoder coder = new VoteMsgTextCoder();

    // Receive a datagram
    DatagramPacket packet = new DatagramPacket(new byte[VoteMsgTextCoder.MAX_WIRE_LENGTH],
        VoteMsgTextCoder.MAX_WIRE_LENGTH);
    sock.receive(packet);

    VoteMsg vote = coder.fromWire(Arrays.copyOfRange(packet.getData(), 0, packet
        .getLength()));

    System.out.println("Received Text-Encoded Request (" + packet.getLength()
        + " bytes): ");
    System.out.println(vote);

    sock.close();
  }
}