source: trunk/src/org/expeditee/network/FrameServer.java@ 309

package org.expeditee.network;

import java.io.BufferedReader;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

import org.expeditee.gui.FrameIO;
import org.expeditee.gui.MessageBay;

public class FrameServer extends DefaultServer {
        public final static int OFFSET = 0;

        public FrameServer(int port) throws IOException {
                super("FrameServer", port);
        }

        protected String getFrame(String frameName) {
                StringBuffer sb = new StringBuffer();
                BufferedReader br = FrameIO.LoadPublicFrame(frameName);
                if (br == null)
                        return null;

                String s = null;
                try {
                        while ((s = br.readLine()) != null) {
                                // Check if there is space for the next line in the packet
                                if (sb.length() + s.length() > MAX_PACKET_LENGTH) {
                                        MessageBay.errorMessage(frameName
                                                        + " is too large to be sent in a single packet");
                                        break;
                                }
                                sb.append(s).append('\n');
                        }
                } catch (IOException e) {
                        e.printStackTrace();
                }

                return sb.toString();
        }

        @Override
        protected void listenForMessages() throws IOException {
                byte[] buf = new byte[FRAMENAME_PACKET_LENGTH];

                // receive request
                DatagramPacket packet = new DatagramPacket(buf, buf.length);
                socket.receive(packet);

                String frameName = new String(packet.getData(), 0, packet.getLength());
                MessageBay.displayMessage("Recieved request for " + frameName);

                // figure out response
                String dString = getFrame(frameName);
                if (dString == null)
                        dString = "";

                buf = dString.getBytes();

                // send the response to the client at "address" and "port"
                InetAddress address = packet.getAddress();
                int port = packet.getPort();
                packet = new DatagramPacket(buf, buf.length, address, port);
                socket.send(packet);
        }
}