//===========================================================================// Java basic classesimport java.net.Socket;import java.net.ServerSocket;import java.io.InputStream;import java.io.OutputStream;// VitralSDK classesimport vsdk.toolkit.common.Vector3D;import vsdk.toolkit.common.Quaternion;import vsdk.toolkit.common.Matrix4x4;import vsdk.toolkit.environment.Camera;import vsdk.toolkit.io.PersistenceElement;class VitralEditorServerProtocol implements Runnable{    private SceneEditorApplication parent;    private Socket socket;    public VitralEditorServerProtocol(SceneEditorApplication parent, Socket socket)    {        this.parent = parent;        this.socket = socket;    }    /**    This method implements current protocol.    The input array is a petition string. Current supported petition strings    are:      - "getSelectedPosition"      - "getSelectedRotation"    Current selected data is extracted from selected object (if one object is    selected) or from current camera if no object is selected.    The output array is a codified binary answer containing two parts: a byte    identifying the data type returned and a series of bytes containing    the data itself.  The current supported packets are:      - 1 - empty answer      - 2 - double answer followed by 4 bytes of big endian double number      - 3 - Vector3D answer followed by 12 bytes of big endian vector data      - 4 - Quaternion answer followed by 16 bytes of big endian quaternion data    */    private byte[] servePetition(String in)    {        //-----------------------------------------------------------------        byte[] out = null;        Vector3D pos;        Quaternion q;        Matrix4x4 R;        Camera camera;        int firstThingSelected = parent.theScene.selectedThings.firstSelected();        if ( firstThingSelected >= 0 &&              firstThingSelected < parent.theScene.scene.getSimpleBodies().size() ) 	{            pos = parent.theScene.scene.getSimpleBodies().get(firstThingSelected).getPosition();            R = parent.theScene.scene.getSimpleBodies().get(firstThingSelected).getRotation();	}	else {            camera = parent.drawingArea.views.get(parent.drawingArea.selectedView).getCamera();            pos = camera.getPosition();            R = camera.getRotation();	}        q = R.exportToQuaternion();        //-----------------------------------------------------------------        if ( in.equals("getSelectedPosition") ) {	    //System.out.println("Processing position vector " + pos);            out = new byte[13];            out[0] = 3;            PersistenceElement.float2byteArrayBE(out, 1, (float)pos.x);            PersistenceElement.float2byteArrayBE(out, 5, (float)pos.y);            PersistenceElement.float2byteArrayBE(out, 9, (float)pos.z);	}	else if ( in.equals("getSelectedRotation") ) {	    //System.out.println("Processing rotation quaternion " + q);            out = new byte[17];            out[0] = 4;            PersistenceElement.float2byteArrayBE(out, 1, (float)q.direction.x);            PersistenceElement.float2byteArrayBE(out, 5, (float)q.direction.y);            PersistenceElement.float2byteArrayBE(out, 9, (float)q.direction.z);            PersistenceElement.float2byteArrayBE(out, 13, (float)q.magnitude);	}	else {            out = new byte[1];            out[0] = 1;	}        return out;    }    public void run()    {        InputStream is;        OutputStream os;        String msg;        System.out.println("Creating new connection with TCP client!");        try {            is = socket.getInputStream();            os = socket.getOutputStream();            while ( true ) {                msg = PersistenceElement.readAsciiString(is);                if ( msg != null && !msg.equals("") ) {                    os.write(servePetition(msg));                }                else {                    System.out.println("Connection dropped!");                    return;                }            }        }        catch ( Exception e ) {            System.err.println("Error on VitralEditorServerProtocol!");            System.err.println(e);        }    }}public class VitralEditorServer implements Runnable{    private SceneEditorApplication parent;    private int tcpPort;    public VitralEditorServer(SceneEditorApplication parent)    {        this.parent = parent;        tcpPort = 1234;        Thread networkThread = new Thread(this);        networkThread.start();    }    public void run()    {        ServerSocket ss;        Socket cs;        VitralEditorServerProtocol listener;        System.out.println("Waiting for connections on TCP port " + tcpPort);        try {            ss = new ServerSocket(tcpPort);            while ( true ) {                cs = ss.accept();                listener = new VitralEditorServerProtocol(parent, cs);                Thread listenerThread;                listenerThread = new Thread(listener);                listenerThread.start();            }        }        catch ( Exception e ) {            System.err.println("Error in VitralEditorServer communications!");            System.err.println(e);        }    }}//===========================================================================//= EOF                                                                     =//===========================================================================