Core/src/eu/univento/core/api/ServerPinger.java

package eu.univento.core.api;

import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.charset.Charset;

public class ServerPinger
{
  private String host;
  private int port;

  public ServerPinger(String host, int port)
  {
    this.host = host;
    this.port = port;
  }

  public ServerPinger(String host) {
    this.host = host;
    this.port = 25565;
  }

  public ServerPinger() {
    this.host = "127.0.0.1";
    this.port = 25565;
  }

  @SuppressWarnings("resource")
public String parseData(Connection connection)
  {
    try
    {
      Socket socket = new Socket();

      socket.setSoTimeout(2500);
      socket.connect(new InetSocketAddress(this.host, this.port));

      OutputStream os = socket.getOutputStream();
      DataOutputStream dos = new DataOutputStream(os);

      InputStream is = socket.getInputStream();
      InputStreamReader isr = new InputStreamReader(is, Charset.forName("UTF-16BE"));

      dos.write(new byte[] { -2, 1 });

      int packetID = is.read();

      if (packetID == -1) {
        System.out.println("Invalid Packet ID! (End Of Stream)");
      }
      if (packetID != 255) {
        System.out.println("Invalid Packet Id! " + packetID);
      }

      int length = isr.read();

      if (length == -1) {
        System.out.println("End Of Stream");
      }

      if (length == 0) {
        System.out.println("Invalid length");
      }

      char[] chars = new char[length];

      if (isr.read(chars, 0, length) != length) {
        System.out.println("End Of Stream");
      }

      String string = new String(chars);
      String[] data = string.split("");

      if (connection == Connection.ONLINE_PLAYERS)
        return data[4];
      if (connection == Connection.MOTD)
        return data[3];
      if (connection == Connection.MAX_PLAYERS) {
        return data[5];
      }
      System.out.println("Connection value not handled!");
    }
    catch (Exception localException)
    {
    	localException.printStackTrace();
    }

    return null;
  }

  public static enum Connection {
    ONLINE_PLAYERS, MAX_PLAYERS, MOTD;
  }
}