adaptation of old eclipse code to Intellij

src/peers/sip/transport/UdpMessageReceiver.java

@@ -0,0 +1,90 @@
+/*
+    This file is part of Peers, a java SIP softphone.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+    
+    Copyright 2007, 2008, 2009, 2010 Yohann Martineau 
+*/
+
+package peers.sip.transport;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.SocketException;
+import java.net.SocketTimeoutException;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+
+import org.pmw.tinylog.Logger;
+import peers.Config;
+
+import peers.sip.RFC3261;
+import peers.sip.transaction.TransactionManager;
+
+
+public class UdpMessageReceiver extends MessageReceiver {
+
+    private DatagramSocket datagramSocket;
+    
+    public UdpMessageReceiver(DatagramSocket datagramSocket,
+            TransactionManager transactionManager,
+            TransportManager transportManager, Config config)
+            throws SocketException {
+        super(datagramSocket.getLocalPort(), transactionManager,
+                transportManager, config);
+        this.datagramSocket = datagramSocket;
+    }
+
+    @Override
+    protected void listen() throws IOException {
+        byte[] buf = new byte[BUFFER_SIZE];
+        final DatagramPacket packet = new DatagramPacket(buf, buf.length);
+        final int noException = 0;
+        final int socketTimeoutException = 1;
+        final int ioException = 2;
+        // AccessController.doPrivileged added for plugin compatibility
+        int result = AccessController.doPrivileged(
+            new PrivilegedAction<Integer>() {
+                public Integer run() {
+                    try {
+                        datagramSocket.receive(packet);
+                    } catch (SocketTimeoutException e) {
+                        return socketTimeoutException;
+                    } catch (IOException e) {
+                        Logger.error("cannot receive packet", e);
+                        return ioException;
+                    }
+                    return noException;
+                }
+            });
+        switch (result) {
+        case socketTimeoutException:
+            return;
+        case ioException:
+            throw new IOException();
+        case noException:
+            break;
+        default:
+            break;
+        }
+        byte[] trimmedPacket = new byte[packet.getLength()];
+        System.arraycopy(packet.getData(), 0,
+                trimmedPacket, 0, trimmedPacket.length);
+        processMessage(trimmedPacket, packet.getAddress(),
+                packet.getPort(), RFC3261.TRANSPORT_UDP);
+    }
+
+
+}