fixed package mismatch

Java/ProjectModels/CognitiveModel/ModelFiles/XPCdependencies/XPlaneConnectDiscovery.java

@@ -0,0 +1,94 @@
+package ModelFiles.XPCdependencies;
+
+import ModelFiles.*;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.InetAddress;
+import java.net.MulticastSocket;
+import java.net.SocketException;
+
+
+/**
+ * The XPlaneConnectDiscovery joins a UDP multi cast group and listens for BECN packets published by
+ * XPlaneConnect server plugin. It allows to clients to discover XPlane instances and be sure that the XPlanePlugin is
+ * installed.
+ */
+public class XPlaneConnectDiscovery implements AutoCloseable {
+
+    private static int DEFAULT_PORT = 49710;
+    private static String DEFAULT_ADDRESS = "239.255.1.1";
+
+    private BeaconReceivedListener mListener;
+
+    private MulticastSocket socket = null;
+    private byte[] buf = new byte[256];
+
+    private int mPort;
+    private String mAddress;
+    private BeaconParser parser = new BeaconParser();
+
+    private XPlaneConnectDiscovery(int port, String address) {
+        mPort = port;
+        mAddress = address;
+    }
+
+    public XPlaneConnectDiscovery() {
+        this(DEFAULT_PORT, DEFAULT_ADDRESS);
+    }
+
+    public void start(DiscoveryConnectionCallback callback) throws IOException {
+        onBeaconReceived(beacon -> {
+            this.close();
+
+            try {
+                XPlaneConnect xpc = new XPlaneConnect(beacon);
+                callback.onConnectionEstablished(xpc);
+            } catch (SocketException e) {
+                System.err.println("Could not connect to a discovered XplaneConnect " +beacon+ ": " + e.getMessage());
+            }
+        });
+        start();
+
+    }
+
+    public void start() throws IOException {
+        System.out.println("Starting XPlane Connect discovery");
+        socket = new MulticastSocket(mPort);
+        InetAddress group = InetAddress.getByName(mAddress);
+        socket.joinGroup(group);
+        while (socket != null) {
+            DatagramPacket packet = new DatagramPacket(buf, buf.length);
+            socket.receive(packet);
+            if (mListener == null) {
+                continue;
+            }
+            try {
+                Beacon beacon = parser.readBCN(packet);
+                mListener.onBeaconReceived(beacon);
+            } catch (IOException ex) {
+                System.err.println("Received packet on discovery group but could not parse it: " + ex);
+            }
+        }
+
+        close();
+        System.out.println("XPlane Connect discovery ended");
+    }
+
+
+    public void onBeaconReceived(BeaconReceivedListener mListener) {
+        this.mListener = mListener;
+    }
+
+    @Override
+    public void close() {
+        if (socket != null) {
+            socket.close();
+            socket = null;
+        }
+    }
+
+    public void stop() {
+        close();
+    }
+}