File transfer upgrade, 1.5 and beautification.

Fixed fault tolerant negotiator. SMACK-128

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@7616 b35dd754-fafc-0310-a699-88a17e54d16e

source/org/jivesoftware/smackx/filetransfer/FaultTolerantNegotiator.java

@@ -30,10 +30,15 @@ import org.jivesoftware.smackx.packet.StreamInitiation;
 
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.util.concurrent.*;
+import java.util.List;
+import java.util.ArrayList;
+
 
 /**
- * The fault tolerant negotiator takes two stream negotiators, the primary and the secondary negotiator.
+ * The fault tolerant negotiator takes two stream negotiators, the primary and the secondary
- * If the primary negotiator fails during the stream negotiaton process, the second negotiator is used.
+ * negotiator. If the primary negotiator fails during the stream negotiaton process, the second
+ * negotiator is used.
  */
 public class FaultTolerantNegotiator extends StreamNegotiator {
 
@@ -43,7 +48,8 @@ public class FaultTolerantNegotiator extends StreamNegotiator {
     private PacketFilter primaryFilter;
     private PacketFilter secondaryFilter;
 
-    public FaultTolerantNegotiator(XMPPConnection connection, StreamNegotiator primary, StreamNegotiator secondary) {
+    public FaultTolerantNegotiator(XMPPConnection connection, StreamNegotiator primary,
+            StreamNegotiator secondary) {
         this.primaryNegotiator = primary;
         this.secondaryNegotiator = secondary;
         this.connection = connection;
@@ -58,41 +64,70 @@ public class FaultTolerantNegotiator extends StreamNegotiator {
     }
 
     InputStream negotiateIncomingStream(Packet streamInitiation) throws XMPPException {
-        throw new UnsupportedOperationException("Negotiation only handled by create incoming stream method.");
+        throw new UnsupportedOperationException("Negotiation only handled by create incoming " +
+                "stream method.");
     }
 
-    final Packet initiateIncomingStream(XMPPConnection connection, StreamInitiation initiation) throws XMPPException {
+    final Packet initiateIncomingStream(XMPPConnection connection, StreamInitiation initiation) {
-        throw new UnsupportedOperationException("Initiation handled by createIncomingStream method");
+        throw new UnsupportedOperationException("Initiation handled by createIncomingStream " +
+                "method");
     }
 
     public InputStream createIncomingStream(StreamInitiation initiation) throws XMPPException {
-        PacketFilter filter = getInitiationPacketFilter(initiation.getFrom(), initiation.getSessionID());
+        PacketCollector collector = connection.createPacketCollector(
-        PacketCollector collector = connection.createPacketCollector(filter);
+                getInitiationPacketFilter(initiation.getFrom(), initiation.getSessionID()));
 
-        StreamInitiation response = super.createInitiationAccept(initiation, getNamespaces());
+        connection.sendPacket(super.createInitiationAccept(initiation, getNamespaces()));
-        connection.sendPacket(response);
 
-        InputStream stream;
+        CompletionService<InputStream> service
+                = new ExecutorCompletionService<InputStream>(Executors.newFixedThreadPool(2));
+        List<Future<InputStream>> futures = new ArrayList<Future<InputStream>>();
+        InputStream stream = null;
+        XMPPException exception = null;
         try {
-            Packet streamInitiation = collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
+            futures.add(service.submit(new NegotiatorService(collector)));
-            if (streamInitiation == null) {
+            futures.add(service.submit(new NegotiatorService(collector)));
-                throw new XMPPException("No response from remote client");
+
+            int i = 0;
+            while (stream == null && i < futures.size()) {
+                Future<InputStream> future;
+                try {
+                    i++;
+                    future = service.poll(10, TimeUnit.SECONDS);
+                }
+                catch (InterruptedException e) {
+                    continue;
+                }
+
+                if (future == null) {
+                    continue;
+                }
+
+                try {
+                    stream = future.get();
+                }
+                catch (InterruptedException e) {
+                    /* Do Nothing */
+                }
+                catch (ExecutionException e) {
+                    exception = new XMPPException(e.getCause());
+                }
             }
-            StreamNegotiator negotiator = determineNegotiator(streamInitiation);
-            stream = negotiator.negotiateIncomingStream(streamInitiation);
         }
-        catch (XMPPException ex) {
+        finally {
-            ex.printStackTrace();
+            for (Future<InputStream> future : futures) {
-            Packet streamInitiation = collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
+                future.cancel(true);
-            collector.cancel();
-            if (streamInitiation == null) {
-                throw new XMPPException("No response from remote client");
             }
-            StreamNegotiator negotiator = determineNegotiator(streamInitiation);
-            stream = negotiator.negotiateIncomingStream(streamInitiation);
-        } finally {
             collector.cancel();
         }
+        if (stream == null) {
+            if (exception != null) {
+                throw exception;
+            }
+            else {
+                throw new XMPPException("File transfer negotiation failed.");
+            }
+        }
 
         return stream;
     }
@@ -101,7 +136,8 @@ public class FaultTolerantNegotiator extends StreamNegotiator {
         return primaryFilter.accept(streamInitiation) ? primaryNegotiator : secondaryNegotiator;
     }
 
-    public OutputStream createOutgoingStream(String streamID, String initiator, String target) throws XMPPException {
+    public OutputStream createOutgoingStream(String streamID, String initiator, String target)
+            throws XMPPException {
         OutputStream stream;
         try {
             stream = primaryNegotiator.createOutgoingStream(streamID, initiator, target);
@@ -114,10 +150,10 @@ public class FaultTolerantNegotiator extends StreamNegotiator {
     }
 
     public String[] getNamespaces() {
-        String [] primary = primaryNegotiator.getNamespaces();
+        String[] primary = primaryNegotiator.getNamespaces();
-        String [] secondary = secondaryNegotiator.getNamespaces();
+        String[] secondary = secondaryNegotiator.getNamespaces();
 
-        String [] namespaces = new String[primary.length + secondary.length];
+        String[] namespaces = new String[primary.length + secondary.length];
         System.arraycopy(primary, 0, namespaces, 0, primary.length);
         System.arraycopy(secondary, 0, namespaces, primary.length, secondary.length);
 
@@ -127,4 +163,22 @@ public class FaultTolerantNegotiator extends StreamNegotiator {
     public void cleanup() {
     }
 
+    private class NegotiatorService implements Callable<InputStream> {
+
+        private PacketCollector collector;
+
+        NegotiatorService(PacketCollector collector) {
+            this.collector = collector;
+        }
+
+        public InputStream call() throws Exception {
+            Packet streamInitiation = collector.nextResult(
+                    SmackConfiguration.getPacketReplyTimeout() * 2);
+            if (streamInitiation == null) {
+                throw new XMPPException("No response from remote client");
+            }
+            StreamNegotiator negotiator = determineNegotiator(streamInitiation);
+            return negotiator.negotiateIncomingStream(streamInitiation);
+        }
+    }
 }

source/org/jivesoftware/smackx/filetransfer/FileTransferNegotiator.java

@@ -74,6 +74,11 @@ public class FileTransferNegotiator {
 
     private static final Random randomGenerator = new Random();
 
+    /**
+     * A static variable to use only offer IBB for file transfer. It is generally recommend to only
+     * set this variable to true for testing purposes as IBB is the backup file transfer method
+     * and shouldn't be used as the only transfer method in production systems.
+     */
     public static boolean IBB_ONLY = false;
 
     /**
@@ -178,7 +183,7 @@ public class FileTransferNegotiator {
 
     private final XMPPConnection connection;
 
-    private final StreamNegotiator byteStreamTransferManager;
+    private final Socks5TransferNegotiatorManager byteStreamTransferManager;
 
     private final StreamNegotiator inbandTransferManager;
 
@@ -186,7 +191,7 @@ public class FileTransferNegotiator {
         configureConnection(connection);
 
         this.connection = connection;
-        byteStreamTransferManager = new Socks5TransferNegotiator(connection);
+        byteStreamTransferManager = new Socks5TransferNegotiatorManager(connection);
         inbandTransferManager = new IBBTransferNegotiator(connection);
     }
 
@@ -298,10 +303,12 @@ public class FileTransferNegotiator {
         }
 
         if (isByteStream && isIBB && field.getType().equals(FormField.TYPE_LIST_MULTI)) {
-            return new FaultTolerantNegotiator(connection, byteStreamTransferManager, inbandTransferManager);
+            return new FaultTolerantNegotiator(connection,
+                    byteStreamTransferManager.createNegotiator(),
+                    inbandTransferManager);
         }
         else if (isByteStream) {
-            return byteStreamTransferManager;
+            return byteStreamTransferManager.createNegotiator();
         }
         else {
             return inbandTransferManager;
@@ -430,10 +437,11 @@ public class FileTransferNegotiator {
         }
 
         if (isByteStream && isIBB) {
-            return new FaultTolerantNegotiator(connection, byteStreamTransferManager, inbandTransferManager);
+            return new FaultTolerantNegotiator(connection,
+                    byteStreamTransferManager.createNegotiator(), inbandTransferManager);
         }
         else if (isByteStream) {
-            return byteStreamTransferManager;
+            return byteStreamTransferManager.createNegotiator();
         }
         else {
             return inbandTransferManager;

source/org/jivesoftware/smackx/filetransfer/FileTransferNegotiatorManager.java

@@ -0,0 +1,26 @@
+/**
+ * $Revision:$
+ * $Date:$
+ *
+ * Copyright 2003-2007 Jive Software.
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.filetransfer;
+
+/**
+ *
+ */
+public interface FileTransferNegotiatorManager {
+    StreamNegotiator createNegotiator();
+}

source/org/jivesoftware/smackx/filetransfer/IBBTransferNegotiator.java

@@ -19,10 +19,7 @@
  */
 package org.jivesoftware.smackx.filetransfer;
 
-import org.jivesoftware.smack.PacketCollector;
+import org.jivesoftware.smack.*;
-import org.jivesoftware.smack.PacketListener;
-import org.jivesoftware.smack.XMPPConnection;
-import org.jivesoftware.smack.XMPPException;
 import org.jivesoftware.smack.util.StringUtils;
 import org.jivesoftware.smack.filter.*;
 import org.jivesoftware.smack.packet.IQ;
@@ -115,12 +112,12 @@ public class IBBTransferNegotiator extends StreamNegotiator {
         PacketCollector collector = connection
                 .createPacketCollector(new PacketIDFilter(openIQ.getPacketID()));
         connection.sendPacket(openIQ);
-
+        // We don't want to wait forever for the result
-        IQ openResponse = (IQ) collector.nextResult();
+        IQ openResponse = (IQ) collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
         collector.cancel();
 
         if (openResponse == null) {
-            throw new XMPPException("No response from peer");
+            throw new XMPPException("No response from peer on IBB open");
         }
 
         IQ.Type type = openResponse.getType();
@@ -144,9 +141,6 @@ public class IBBTransferNegotiator extends StreamNegotiator {
     public void cleanup() {
     }
 
-    public void cancel() {
-    }
-
     private class IBBOutputStream extends OutputStream {
 
         protected byte[] buffer;
@@ -457,10 +451,8 @@ public class IBBTransferNegotiator extends StreamNegotiator {
 
             IBBExtensions.Data data = (IBBExtensions.Data) packet.
                     getExtension(IBBExtensions.Data.ELEMENT_NAME, IBBExtensions.NAMESPACE);
-            if (data == null) {
+            return data != null && data.getSessionID() != null
-                return false;
+                    && data.getSessionID().equalsIgnoreCase(sessionID);
-            }
-            return data.getSessionID() != null && data.getSessionID().equalsIgnoreCase(sessionID);
         }
     }
 

source/org/jivesoftware/smackx/filetransfer/IncomingFileTransfer.java

@@ -22,6 +22,7 @@ package org.jivesoftware.smackx.filetransfer;
 import org.jivesoftware.smack.XMPPException;
 
 import java.io.*;
+import java.util.concurrent.*;
 
 /**
  * An incoming file transfer is created when the
@@ -94,7 +95,7 @@ public class IncomingFileTransfer extends FileTransfer {
      * </UL>
      *
      * @param file The location to save the file.
-     * @throws XMPPException when the file transfer fails
+     * @throws XMPPException            when the file transfer fails
      * @throws IllegalArgumentException This exception is thrown when the the provided file is
      *                                  either null, or cannot be written to.
      */
@@ -151,13 +152,13 @@ public class IncomingFileTransfer extends FileTransfer {
                     try {
                         inputStream.close();
                     }
-                    catch(Throwable io) {
+                    catch (Throwable io) {
                         /* Ignore */
                     }
                 }
                 if (outputStream != null) {
                     try {
-                    outputStream.close();
+                        outputStream.close();
                     }
                     catch (Throwable io) {
                         /* Ignore */
@@ -175,11 +176,34 @@ public class IncomingFileTransfer extends FileTransfer {
 
     private InputStream negotiateStream() throws XMPPException {
         setStatus(Status.negotiating_transfer);
-        StreamNegotiator streamNegotiator = negotiator
+        final StreamNegotiator streamNegotiator = negotiator
                 .selectStreamNegotiator(recieveRequest);
         setStatus(Status.negotiating_stream);
-        InputStream inputStream = streamNegotiator
+        FutureTask<InputStream> streamNegotiatorTask = new FutureTask<InputStream>(
-                .createIncomingStream(recieveRequest.getStreamInitiation());
+                new Callable<InputStream>() {
+
+                    public InputStream call() throws Exception {
+                        return streamNegotiator
+                                .createIncomingStream(recieveRequest.getStreamInitiation());
+                    }
+                });
+        streamNegotiatorTask.run();
+        InputStream inputStream;
+        try {
+            inputStream = streamNegotiatorTask.get(15, TimeUnit.SECONDS);
+        }
+        catch (InterruptedException e) {
+            throw new XMPPException("Interruption while executing", e);
+        }
+        catch (ExecutionException e) {
+            throw new XMPPException("Error in execution", e);
+        }
+        catch (TimeoutException e) {
+            throw new XMPPException("Request timed out", e);
+        }
+        finally {
+            streamNegotiatorTask.cancel(true);
+        }
         setStatus(Status.negotiated);
         return inputStream;
     }

source/org/jivesoftware/smackx/filetransfer/Socks5TransferNegotiator.java

@@ -31,20 +31,17 @@ import org.jivesoftware.smack.packet.IQ;
 import org.jivesoftware.smack.packet.Packet;
 import org.jivesoftware.smack.packet.XMPPError;
 import org.jivesoftware.smack.util.StringUtils;
-import org.jivesoftware.smack.util.Cache;
-import org.jivesoftware.smackx.ServiceDiscoveryManager;
 import org.jivesoftware.smackx.packet.Bytestream;
 import org.jivesoftware.smackx.packet.Bytestream.StreamHost;
 import org.jivesoftware.smackx.packet.Bytestream.StreamHostUsed;
-import org.jivesoftware.smackx.packet.DiscoverInfo;
-import org.jivesoftware.smackx.packet.DiscoverInfo.Identity;
-import org.jivesoftware.smackx.packet.DiscoverItems;
-import org.jivesoftware.smackx.packet.DiscoverItems.Item;
 import org.jivesoftware.smackx.packet.StreamInitiation;
 
 import java.io.*;
-import java.net.*;
+import java.net.InetAddress;
-import java.util.*;
+import java.net.Socket;
+import java.net.UnknownHostException;
+import java.util.Collection;
+import java.util.Iterator;
 
 /**
  * A SOCKS5 bytestream is negotiated partly over the XMPP XML stream and partly
@@ -80,28 +77,17 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
      */
     private static final int CONNECT_FAILURE_THRESHOLD = 2;
 
-    private static final long BLACKLIST_LIFETIME = 60 * 1000 * 120;
-
     public static boolean isAllowLocalProxyHost = true;
 
     private final XMPPConnection connection;
 
-    private List<String> proxies;
+    private Socks5TransferNegotiatorManager transferNegotiatorManager;
 
-    private List<String> streamHosts;
+    public Socks5TransferNegotiator(Socks5TransferNegotiatorManager transferNegotiatorManager,
-
+            final XMPPConnection connection)
-    // locks the proxies during their initialization process
+    {
-    private final Object proxyLock = new Object();
-
-    private ProxyProcess proxyProcess;
-
-    // locks on the proxy process during its initiatilization process
-    private final Object processLock = new Object();
-
-    private final Cache addressBlacklist = new Cache(100, BLACKLIST_LIFETIME);
-
-    public Socks5TransferNegotiator(final XMPPConnection connection) {
         this.connection = connection;
+        this.transferNegotiatorManager = transferNegotiatorManager;
     }
 
     public PacketFilter getInitiationPacketFilter(String from, String sessionID) {
@@ -117,7 +103,6 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
       */
     InputStream negotiateIncomingStream(Packet streamInitiation)
             throws XMPPException {
-
         Bytestream streamHostsInfo = (Bytestream) streamInitiation;
 
         if (streamHostsInfo.getType().equals(IQ.Type.ERROR)) {
@@ -135,7 +120,7 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
                         ex.getXMPPError());
                 connection.sendPacket(errorPacket);
             }
-            throw(ex);
+            throw (ex);
         }
 
         // send used-host confirmation
@@ -145,7 +130,11 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
         connection.sendPacket(streamResponse);
 
         try {
-            return selectedHost.establishedSocket.getInputStream();
+            PushbackInputStream stream = new PushbackInputStream(
+                    selectedHost.establishedSocket.getInputStream());
+            int firstByte = stream.read();
+            stream.unread(firstByte);
+            return stream;
         }
         catch (IOException e) {
             throw new XMPPException("Error establishing input stream", e);
@@ -184,13 +173,12 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
      * Selects a host to connect to over which the file will be transmitted.
      *
      * @param streamHostsInfo the packet recieved from the initiator containing the available hosts
-     * to transfer the file
+     *                        to transfer the file
      * @return the selected host and socket that were created.
      * @throws XMPPException when there is no appropriate host.
      */
     private SelectedHostInfo selectHost(Bytestream streamHostsInfo)
-            throws XMPPException
+            throws XMPPException {
-    {
         Iterator it = streamHostsInfo.getStreamHosts().iterator();
         StreamHost selectedHost = null;
         Socket socket = null;
@@ -200,7 +188,7 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
 
             // Check to see if this address has been blacklisted
             int failures = getConnectionFailures(address);
-            if(failures >= CONNECT_FAILURE_THRESHOLD) {
+            if (failures >= CONNECT_FAILURE_THRESHOLD) {
                 continue;
             }
             // establish socket
@@ -219,7 +207,7 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
                 socket = null;
             }
         }
-        if (selectedHost == null || socket == null ||  !socket.isConnected()) {
+        if (selectedHost == null || socket == null || !socket.isConnected()) {
             String errorMessage = "Could not establish socket with any provided host";
             throw new XMPPException(errorMessage, new XMPPError(
                     XMPPError.Condition.no_acceptable, errorMessage));
@@ -229,19 +217,11 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
     }
 
     private void incrementConnectionFailures(String address) {
-        Integer count = (Integer) addressBlacklist.get(address);
+        transferNegotiatorManager.incrementConnectionFailures(address);
-        if(count == null) {
-            count = new Integer(1);
-        }
-        else {
-            count = new Integer(count.intValue() + 1);
-        }
-        addressBlacklist.put(address, count);
     }
 
     private int getConnectionFailures(String address) {
-        Integer count = (Integer) addressBlacklist.get(address);
+        return transferNegotiatorManager.getConnectionFailures(address);
-        return (count != null ? count.intValue() : 0);
     }
 
     /**
@@ -292,9 +272,8 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
     }
 
     private Socket initBytestreamSocket(final String sessionID,
-            String initiator, String target) throws Exception
+            String initiator, String target) throws Exception {
-    {
+        Socks5TransferNegotiatorManager.ProxyProcess process;
-        ProxyProcess process;
         try {
             process = establishListeningSocket();
         }
@@ -328,14 +307,14 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
      * @param sessionID The session id of the stream.
      * @param proxy     The server socket which will listen locally for remote
      *                  connections.
-     * @param digest the digest of the userids and the session id
+     * @param digest    the digest of the userids and the session id
-     * @param query the query which the response is being awaited
+     * @param query     the query which the response is being awaited
      * @return the selected host
      * @throws XMPPException when the response from the peer is an error or doesn't occur
-     * @throws IOException when there is an error establishing the local socket
+     * @throws IOException   when there is an error establishing the local socket
      */
     private SelectedHostInfo waitForUsedHostResponse(String sessionID,
-            final ProxyProcess proxy, final String digest,
+            final Socks5TransferNegotiatorManager.ProxyProcess proxy, final String digest,
             final Bytestream query) throws XMPPException, IOException
     {
         SelectedHostInfo info = new SelectedHostInfo();
@@ -394,22 +373,13 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
         }
     }
 
-    private ProxyProcess establishListeningSocket() throws IOException {
+    private Socks5TransferNegotiatorManager.ProxyProcess establishListeningSocket()
-        synchronized (processLock) {
+            throws IOException {
-            if (proxyProcess == null) {
+        return transferNegotiatorManager.addTransfer();
-                proxyProcess = new ProxyProcess(new ServerSocket(7777));
-                proxyProcess.start();
-            }
-        }
-        proxyProcess.addTransfer();
-        return proxyProcess;
     }
 
     private void cleanupListeningSocket() {
-        if (proxyProcess == null) {
+        transferNegotiatorManager.removeTransfer();
-            return;
-        }
-        proxyProcess.removeTransfer();
     }
 
     private String discoverLocalIP() throws UnknownHostException {
@@ -439,34 +409,31 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
      * &lt;/iq&gt;
      * </pre>
      *
-     * @param from initiator@host1/foo - the file transfer initiator.
+     * @param from    initiator@host1/foo - the file transfer initiator.
-     * @param to target@host2/bar - the file transfer target.
+     * @param to      target@host2/bar - the file transfer target.
-     * @param sid 'mySID' - the unique identifier for this file transfer
+     * @param sid     'mySID' - the unique identifier for this file transfer
      * @param localIP the IP of the local machine if it is being provided, null otherwise.
-     * @param port the port of the local mahine if it is being provided, null otherwise.
+     * @param port    the port of the local mahine if it is being provided, null otherwise.
      * @return the created <b><i>Bytestream</b></i> packet
      */
     private Bytestream createByteStreamInit(final String from, final String to,
-            final String sid, final String localIP, final int port) {
+            final String sid, final String localIP, final int port)
+    {
         Bytestream bs = new Bytestream();
         bs.setTo(to);
         bs.setFrom(from);
         bs.setSessionID(sid);
         bs.setType(IQ.Type.SET);
-        bs.setMode(Bytestream.Mode.TCP);
+        bs.setMode(Bytestream.Mode.tcp);
         if (localIP != null && port > 0) {
             bs.addStreamHost(from, localIP, port);
         }
         // make sure the proxies have been initialized completely
-        synchronized (proxyLock) {
+        Collection<Bytestream.StreamHost> streamHosts = transferNegotiatorManager.getStreamHosts();
-            if (proxies == null) {
+
-                initProxies();
-            }
-        }
         if (streamHosts != null) {
-            Iterator it = streamHosts.iterator();
+            for (StreamHost host : streamHosts) {
-            while (it.hasNext()) {
+                bs.addStreamHost(host);
-                bs.addStreamHost((StreamHost) it.next());
             }
         }
 
@@ -474,101 +441,20 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
     }
 
 
-
-    /**
-     * Checks the service discovery item returned from a server component to verify if it is
-     * a File Transfer proxy or not.
-     *
-     * @param manager the service discovery manager which will be used to query the component
-     * @param item the discovered item on the server relating
-     * @return returns the JID of the proxy if it is a proxy or null if the item is not a proxy.
-     */
-    private String checkIsProxy(ServiceDiscoveryManager manager, Item item) {
-        DiscoverInfo info;
-        try {
-            info = manager.discoverInfo(item.getEntityID());
-        }
-        catch (XMPPException e) {
-            return null;
-        }
-        Iterator itx = info.getIdentities();
-        while (itx.hasNext()) {
-            DiscoverInfo.Identity identity = (Identity) itx.next();
-            if ("proxy".equalsIgnoreCase(identity.getCategory())
-                    && "bytestreams".equalsIgnoreCase(
-                    identity.getType())) {
-                return info.getFrom();
-            }
-        }
-        return null;
-    }
-
-    private void initProxies() {
-        proxies = new ArrayList<String>();
-        ServiceDiscoveryManager manager = ServiceDiscoveryManager
-                .getInstanceFor(connection);
-        try {
-            DiscoverItems discoItems = manager.discoverItems(connection.getServiceName());
-            Iterator it = discoItems.getItems();
-            while (it.hasNext()) {
-                DiscoverItems.Item item = (Item) it.next();
-                String proxy = checkIsProxy(manager, item);
-                if(proxy != null) {
-                    proxies.add(proxy);
-                }
-            }
-        }
-        catch (XMPPException e) {
-            return;
-        }
-        if (proxies.size() > 0) {
-            initStreamHosts();
-        }
-    }
-
-    private void initStreamHosts() {
-        List streamHosts = new ArrayList();
-        Iterator it = proxies.iterator();
-        IQ query;
-        PacketCollector collector;
-        Bytestream response;
-        while (it.hasNext()) {
-            String jid = it.next().toString();
-            query = new IQ() {
-                public String getChildElementXML() {
-                    return "<query xmlns=\"http://jabber.org/protocol/bytestreams\"/>";
-                }
-            };
-            query.setType(IQ.Type.GET);
-            query.setTo(jid);
-
-            collector = connection.createPacketCollector(new PacketIDFilter(
-                    query.getPacketID()));
-            connection.sendPacket(query);
-
-            response = (Bytestream) collector.nextResult(SmackConfiguration
-                    .getPacketReplyTimeout());
-            if (response != null) {
-                streamHosts.addAll(response.getStreamHosts());
-            }
-            collector.cancel();
-        }
-        this.streamHosts = streamHosts;
-    }
-
     /**
      * Returns the packet to send notification to the stream host to activate
      * the stream.
      *
      * @param sessionID the session ID of the file transfer to activate.
-     * @param from
+     * @param from      the sender of the bytestreeam
-     * @param to the JID of the stream host
+     * @param to        the JID of the stream host
-     * @param target the JID of the file transfer target.
+     * @param target    the JID of the file transfer target.
      * @return the packet to send notification to the stream host to
      *         activate the stream.
      */
     private static Bytestream createByteStreamActivate(final String sessionID,
-            final String from, final String to, final String target) {
+            final String from, final String to, final String target)
+    {
         Bytestream activate = new Bytestream(sessionID);
         activate.setMode(null);
         activate.setToActivate(target);
@@ -578,61 +464,6 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
         return activate;
     }
 
-    /**
-     * Negotiates the Socks 5 bytestream when the local computer is acting as
-     * the proxy.
-     *
-     * @param connection the socket connection with the peer.
-     * @return the SHA-1 digest that is used to uniquely identify the file
-     *         transfer.
-     * @throws XMPPException
-     * @throws IOException
-     */
-    private String establishSocks5UploadConnection(Socket connection) throws XMPPException, IOException {
-        OutputStream out = new DataOutputStream(connection.getOutputStream());
-        InputStream in = new DataInputStream(connection.getInputStream());
-
-        // first byte is version should be 5
-        int b = in.read();
-        if (b != 5) {
-            throw new XMPPException("Only SOCKS5 supported");
-        }
-
-        // second byte number of authentication methods supported
-        b = in.read();
-        int[] auth = new int[b];
-        for (int i = 0; i < b; i++) {
-            auth[i] = in.read();
-        }
-
-        int authMethod = -1;
-        for (int i = 0; i < auth.length; i++) {
-            authMethod = (auth[i] == 0 ? 0 : -1); // only auth method
-            // 0, no
-            // authentication,
-            // supported
-            if (authMethod == 0) {
-                break;
-            }
-        }
-        if (authMethod != 0) {
-            throw new XMPPException("Authentication method not supported");
-        }
-        byte[] cmd = new byte[2];
-        cmd[0] = (byte) 0x05;
-        cmd[1] = (byte) 0x00;
-        out.write(cmd);
-
-        String responseDigest = createIncomingSocks5Message(in);
-        cmd = createOutgoingSocks5Message(0, responseDigest);
-
-        if (!connection.isConnected()) {
-            throw new XMPPException("Socket closed by remote user");
-        }
-        out.write(cmd);
-        return responseDigest;
-    }
-
     public String[] getNamespaces() {
         return new String[]{NAMESPACE};
     }
@@ -659,7 +490,7 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
         createIncomingSocks5Message(in);
     }
 
-    private String createIncomingSocks5Message(InputStream in)
+    static String createIncomingSocks5Message(InputStream in)
             throws IOException {
         byte[] cmd = new byte[5];
         in.read(cmd, 0, 5);
@@ -673,7 +504,7 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
         return digest;
     }
 
-    private byte[] createOutgoingSocks5Message(int cmd, String digest) {
+    static byte[] createOutgoingSocks5Message(int cmd, String digest) {
         byte addr[] = digest.getBytes();
 
         byte[] data = new byte[7 + addr.length];
@@ -691,14 +522,7 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
     }
 
     public void cleanup() {
-        synchronized (processLock) {
-            if (proxyProcess != null) {
-                proxyProcess.stop();
-            }
-        }
-    }
 
-    public void cancel() {
     }
 
     private static class SelectedHostInfo {
@@ -718,132 +542,6 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
         }
     }
 
-    private class ProxyProcess implements Runnable {
-
-        private final ServerSocket listeningSocket;
-
-        private final Map connectionMap = new HashMap();
-
-        private boolean done = false;
-
-        private Thread thread;
-        private int transfers;
-
-        public void run() {
-            try {
-                try {
-                    listeningSocket.setSoTimeout(10000);
-                }
-                catch (SocketException e) {
-                    // There was a TCP error, lets print the stack trace
-                    e.printStackTrace();
-                    return;
-                }
-                while (!done) {
-                    Socket conn = null;
-                    synchronized (ProxyProcess.this) {
-                        while (transfers <= 0 && !done) {
-                            transfers = -1;
-                            try {
-                                ProxyProcess.this.wait();
-                            }
-                            catch (InterruptedException e) {
-                                /* Do nothing */
-                            }
-                        }
-                    }
-                    if(done) {
-                        break;
-                    }
-                    try {
-                        synchronized (listeningSocket) {
-                            conn = listeningSocket.accept();
-                        }
-                        if (conn == null) {
-                            continue;
-                        }
-                        String digest = establishSocks5UploadConnection(conn);
-                        synchronized (connectionMap) {
-                            connectionMap.put(digest, conn);
-                        }
-                    }
-                    catch (SocketTimeoutException e) {
-                        /* Do Nothing */
-                    }
-                    catch (IOException e) {
-                        /* Do Nothing */
-                    }
-                    catch (XMPPException e) {
-                        e.printStackTrace();
-                        if (conn != null) {
-                            try {
-                                conn.close();
-                            }
-                            catch (IOException e1) {
-                                /* Do Nothing */
-                            }
-                        }
-                    }
-                }
-            }
-            finally {
-                try {
-                    listeningSocket.close();
-                }
-                catch (IOException e) {
-                    /* Do Nothing */
-                }
-            }
-        }
-
-
-        public void start() {
-            thread.start();
-        }
-
-        public void stop() {
-            done = true;
-            synchronized (this) {
-                this.notify();
-            }
-            synchronized (listeningSocket) {
-                listeningSocket.notify();
-            }
-        }
-
-        public int getPort() {
-            return listeningSocket.getLocalPort();
-        }
-
-        ProxyProcess(ServerSocket listeningSocket) {
-            thread = new Thread(this, "File Transfer Connection Listener");
-            this.listeningSocket = listeningSocket;
-        }
-
-        public Socket getSocket(String digest) {
-            synchronized (connectionMap) {
-                return (Socket) connectionMap.get(digest);
-            }
-        }
-
-        public void addTransfer() {
-            synchronized (this) {
-                if (transfers == -1) {
-                    transfers = 1;
-                    this.notify();
-                }
-                else {
-                    transfers++;
-                }
-            }
-        }
-
-        public void removeTransfer() {
-            synchronized (this) {
-                transfers--;
-            }
-        }
-    }
 
     private static class BytestreamSIDFilter implements PacketFilter {
 

source/org/jivesoftware/smackx/filetransfer/Socks5TransferNegotiatorManager.java

@@ -0,0 +1,388 @@
+/**
+ * $Revision:$
+ * $Date:$
+ *
+ * Copyright 2003-2007 Jive Software.
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.filetransfer;
+
+import org.jivesoftware.smack.util.Cache;
+import org.jivesoftware.smack.XMPPException;
+import org.jivesoftware.smack.PacketCollector;
+import org.jivesoftware.smack.SmackConfiguration;
+import org.jivesoftware.smack.XMPPConnection;
+import org.jivesoftware.smack.filter.PacketIDFilter;
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smackx.ServiceDiscoveryManager;
+import org.jivesoftware.smackx.packet.DiscoverItems;
+import org.jivesoftware.smackx.packet.Bytestream;
+import org.jivesoftware.smackx.packet.DiscoverInfo;
+
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.SocketException;
+import java.net.SocketTimeoutException;
+import java.util.*;
+import java.io.*;
+
+/**
+ *
+ */
+public class Socks5TransferNegotiatorManager implements FileTransferNegotiatorManager {
+
+    private static final long BLACKLIST_LIFETIME = 60 * 1000 * 120;
+    // locks the proxies during their initialization process
+    private final Object proxyLock = new Object();
+
+    private static ProxyProcess proxyProcess;
+
+    // locks on the proxy process during its initiatilization process
+    private final Object processLock = new Object();
+
+    private final Cache<String, Integer> addressBlacklist
+            = new Cache<String, Integer>(100, BLACKLIST_LIFETIME);
+
+    private XMPPConnection connection;
+
+    private List<String> proxies;
+
+    private List<Bytestream.StreamHost> streamHosts;
+
+    public Socks5TransferNegotiatorManager(XMPPConnection connection) {
+        this.connection = connection;
+    }
+
+    public StreamNegotiator createNegotiator() {
+        return new Socks5TransferNegotiator(this, connection);
+    }
+
+    public void incrementConnectionFailures(String address) {
+        Integer count = addressBlacklist.get(address);
+        if (count == null) {
+            count = 1;
+        }
+        else {
+            count += 1;
+        }
+        addressBlacklist.put(address, count);
+    }
+
+    public int getConnectionFailures(String address) {
+        Integer count = addressBlacklist.get(address);
+        return count != null ? count : 0;
+    }
+
+    public ProxyProcess addTransfer() throws IOException {
+        synchronized (processLock) {
+            if (proxyProcess == null) {
+                proxyProcess = new ProxyProcess(new ServerSocket(7777));
+                proxyProcess.start();
+            }
+        }
+        proxyProcess.addTransfer();
+        return proxyProcess;
+    }
+
+    public void removeTransfer() {
+        if (proxyProcess == null) {
+            return;
+        }
+        proxyProcess.removeTransfer();
+    }
+
+    public Collection<Bytestream.StreamHost> getStreamHosts() {
+        synchronized (proxyLock) {
+            if (proxies == null) {
+                initProxies();
+            }
+        }
+        return Collections.unmodifiableCollection(streamHosts);
+    }
+
+    /**
+     * Checks the service discovery item returned from a server component to verify if it is
+     * a File Transfer proxy or not.
+     *
+     * @param manager the service discovery manager which will be used to query the component
+     * @param item    the discovered item on the server relating
+     * @return returns the JID of the proxy if it is a proxy or null if the item is not a proxy.
+     */
+    private String checkIsProxy(ServiceDiscoveryManager manager, DiscoverItems.Item item) {
+        DiscoverInfo info;
+        try {
+            info = manager.discoverInfo(item.getEntityID());
+        }
+        catch (XMPPException e) {
+            return null;
+        }
+        Iterator itx = info.getIdentities();
+        while (itx.hasNext()) {
+            DiscoverInfo.Identity identity = (DiscoverInfo.Identity) itx.next();
+            if ("proxy".equalsIgnoreCase(identity.getCategory())
+                    && "bytestreams".equalsIgnoreCase(
+                    identity.getType())) {
+                return info.getFrom();
+            }
+        }
+        return null;
+    }
+
+    private void initProxies() {
+        proxies = new ArrayList<String>();
+        ServiceDiscoveryManager manager = ServiceDiscoveryManager
+                .getInstanceFor(connection);
+        try {
+            DiscoverItems discoItems = manager.discoverItems(connection.getServiceName());
+            Iterator it = discoItems.getItems();
+            while (it.hasNext()) {
+                DiscoverItems.Item item = (DiscoverItems.Item) it.next();
+                String proxy = checkIsProxy(manager, item);
+                if (proxy != null) {
+                    proxies.add(proxy);
+                }
+            }
+        }
+        catch (XMPPException e) {
+            return;
+        }
+        if (proxies.size() > 0) {
+            initStreamHosts();
+        }
+    }
+
+    /**
+     * Loads streamhost address and ports from the proxies on the local server.
+     */
+    private void initStreamHosts() {
+        List<Bytestream.StreamHost> streamHosts = new ArrayList<Bytestream.StreamHost>();
+        Iterator it = proxies.iterator();
+        IQ query;
+        PacketCollector collector;
+        Bytestream response;
+        while (it.hasNext()) {
+            String jid = it.next().toString();
+            query = new IQ() {
+                public String getChildElementXML() {
+                    return "<query xmlns=\"http://jabber.org/protocol/bytestreams\"/>";
+                }
+            };
+            query.setType(IQ.Type.GET);
+            query.setTo(jid);
+
+            collector = connection.createPacketCollector(new PacketIDFilter(
+                    query.getPacketID()));
+            connection.sendPacket(query);
+
+            response = (Bytestream) collector.nextResult(SmackConfiguration
+                    .getPacketReplyTimeout());
+            if (response != null) {
+                streamHosts.addAll(response.getStreamHosts());
+            }
+            collector.cancel();
+        }
+        this.streamHosts = streamHosts;
+    }
+
+    public void cleanup() {
+        synchronized (processLock) {
+            if (proxyProcess != null) {
+                proxyProcess.stop();
+                proxyProcess = null;
+            }
+        }
+    }
+
+    class ProxyProcess implements Runnable {
+
+        private final ServerSocket listeningSocket;
+
+        private final Map<String, Socket> connectionMap = new HashMap<String, Socket>();
+
+        private boolean done = false;
+
+        private Thread thread;
+        private int transfers;
+
+        public void run() {
+            try {
+                try {
+                    listeningSocket.setSoTimeout(10000);
+                }
+                catch (SocketException e) {
+                    // There was a TCP error, lets print the stack trace
+                    e.printStackTrace();
+                    return;
+                }
+                while (!done) {
+                    Socket conn = null;
+                    synchronized (ProxyProcess.this) {
+                        while (transfers <= 0 && !done) {
+                            transfers = -1;
+                            try {
+                                ProxyProcess.this.wait();
+                            }
+                            catch (InterruptedException e) {
+                                /* Do nothing */
+                            }
+                        }
+                    }
+                    if (done) {
+                        break;
+                    }
+                    try {
+                        synchronized (listeningSocket) {
+                            conn = listeningSocket.accept();
+                        }
+                        if (conn == null) {
+                            continue;
+                        }
+                        String digest = establishSocks5UploadConnection(conn);
+                        synchronized (connectionMap) {
+                            connectionMap.put(digest, conn);
+                        }
+                    }
+                    catch (SocketTimeoutException e) {
+                        /* Do Nothing */
+                    }
+                    catch (IOException e) {
+                        /* Do Nothing */
+                    }
+                    catch (XMPPException e) {
+                        e.printStackTrace();
+                        if (conn != null) {
+                            try {
+                                conn.close();
+                            }
+                            catch (IOException e1) {
+                                /* Do Nothing */
+                            }
+                        }
+                    }
+                }
+            }
+            finally {
+                try {
+                    listeningSocket.close();
+                }
+                catch (IOException e) {
+                    /* Do Nothing */
+                }
+            }
+        }
+
+        /**
+         * Negotiates the Socks 5 bytestream when the local computer is acting as
+         * the proxy.
+         *
+         * @param connection the socket connection with the peer.
+         * @return the SHA-1 digest that is used to uniquely identify the file
+         *         transfer.
+         * @throws XMPPException
+         * @throws IOException
+         */
+        private String establishSocks5UploadConnection(Socket connection) throws XMPPException, IOException {
+            OutputStream out = new DataOutputStream(connection.getOutputStream());
+            InputStream in = new DataInputStream(connection.getInputStream());
+
+            // first byte is version should be 5
+            int b = in.read();
+            if (b != 5) {
+                throw new XMPPException("Only SOCKS5 supported");
+            }
+
+            // second byte number of authentication methods supported
+            b = in.read();
+            int[] auth = new int[b];
+            for (int i = 0; i < b; i++) {
+                auth[i] = in.read();
+            }
+
+            int authMethod = -1;
+            for (int anAuth : auth) {
+                authMethod = (anAuth == 0 ? 0 : -1); // only auth method
+                // 0, no
+                // authentication,
+                // supported
+                if (authMethod == 0) {
+                    break;
+                }
+            }
+            if (authMethod != 0) {
+                throw new XMPPException("Authentication method not supported");
+            }
+            byte[] cmd = new byte[2];
+            cmd[0] = (byte) 0x05;
+            cmd[1] = (byte) 0x00;
+            out.write(cmd);
+
+            String responseDigest = Socks5TransferNegotiator.createIncomingSocks5Message(in);
+            cmd = Socks5TransferNegotiator.createOutgoingSocks5Message(0, responseDigest);
+
+            if (!connection.isConnected()) {
+                throw new XMPPException("Socket closed by remote user");
+            }
+            out.write(cmd);
+            return responseDigest;
+        }
+
+
+        public void start() {
+            thread.start();
+        }
+
+        public void stop() {
+            done = true;
+            synchronized (this) {
+                this.notify();
+            }
+            synchronized (listeningSocket) {
+                listeningSocket.notify();
+            }
+        }
+
+        public int getPort() {
+            return listeningSocket.getLocalPort();
+        }
+
+        ProxyProcess(ServerSocket listeningSocket) {
+            thread = new Thread(this, "File Transfer Connection Listener");
+            this.listeningSocket = listeningSocket;
+        }
+
+        public Socket getSocket(String digest) {
+            synchronized (connectionMap) {
+                return connectionMap.get(digest);
+            }
+        }
+
+        public void addTransfer() {
+            synchronized (this) {
+                if (transfers == -1) {
+                    transfers = 1;
+                    this.notify();
+                }
+                else {
+                    transfers++;
+                }
+            }
+        }
+
+        public void removeTransfer() {
+            synchronized (this) {
+                transfers--;
+            }
+        }
+    }
+}

source/org/jivesoftware/smackx/filetransfer/StreamNegotiator.java

@@ -54,7 +54,8 @@ public abstract class StreamNegotiator {
      * @return The response to be forwarded to the initator.
      */
     public StreamInitiation createInitiationAccept(
-            StreamInitiation streamInitiationOffer, String [] namespaces) {
+            StreamInitiation streamInitiationOffer, String[] namespaces)
+    {
         StreamInitiation response = new StreamInitiation();
         response.setTo(streamInitiationOffer.getFrom());
         response.setFrom(streamInitiationOffer.getTo());
@@ -64,8 +65,8 @@ public abstract class StreamNegotiator {
         DataForm form = new DataForm(Form.TYPE_SUBMIT);
         FormField field = new FormField(
                 FileTransferNegotiator.STREAM_DATA_FIELD_NAME);
-        for (int i = 0; i < namespaces.length; i++) {
+        for (String namespace : namespaces) {
-            field.addValue(namespaces[i]);
+            field.addValue(namespace);
         }
         form.addField(field);
 
@@ -160,5 +161,4 @@ public abstract class StreamNegotiator {
      */
     public abstract void cleanup();
 
-
 }

source/org/jivesoftware/smackx/packet/Bytestream.java

@@ -33,9 +33,9 @@ public class Bytestream extends IQ {
 
     private String sessionID;
 
-    private Mode mode = Mode.TCP;
+    private Mode mode = Mode.tcp;
 
-    private final List streamHosts = new ArrayList();
+    private final List<StreamHost> streamHosts = new ArrayList<StreamHost>();
 
     private StreamHostUsed usedHost;
 
@@ -63,7 +63,7 @@ public class Bytestream extends IQ {
      * Set the session ID related to the Byte Stream. The session ID is a unique
      * identifier used to differentiate between stream negotations.
      *
-     * @param sessionID
+     * @param sessionID the unique session ID that identifies the transfer.
      */
     public void setSessionID(final String sessionID) {
         this.sessionID = sessionID;
@@ -83,7 +83,7 @@ public class Bytestream extends IQ {
      * Set the transport mode. This should be put in the initiation of the
      * interaction.
      *
-     * @param mode
+     * @param mode the transport mode, either UDP or TCP
      * @see Mode
      */
     public void setMode(final Mode mode) {
@@ -145,7 +145,7 @@ public class Bytestream extends IQ {
      *
      * @return Returns the list of stream hosts contained in the packet.
      */
-    public Collection getStreamHosts() {
+    public Collection<StreamHost> getStreamHosts() {
         return Collections.unmodifiableCollection(streamHosts);
     }
 
@@ -158,9 +158,10 @@ public class Bytestream extends IQ {
      *         if there is none.
      */
     public StreamHost getStreamHost(final String JID) {
-        StreamHost host;
+        if(JID == null) {
-        for (Iterator it = streamHosts.iterator(); it.hasNext();) {
+            return null;
-            host = (StreamHost) it.next();
+        }
+        for (StreamHost host : streamHosts) {
             if (host.getJID().equals(JID)) {
                 return host;
             }
@@ -233,8 +234,9 @@ public class Bytestream extends IQ {
                 buf.append(" mode = \"").append(getMode()).append("\"");
             buf.append(">");
             if (getToActivate() == null) {
-                for (Iterator it = getStreamHosts().iterator(); it.hasNext();)
+                for (StreamHost streamHost : getStreamHosts()) {
-                    buf.append(((StreamHost) it.next()).toXML());
+                    buf.append(streamHost.toXML());
+                }
             }
             else {
                 buf.append(getToActivate().toXML());
@@ -246,8 +248,8 @@ public class Bytestream extends IQ {
                 buf.append(getUsedHost().toXML());
             // A result from the server can also contain stream hosts
             else if (countStreamHosts() > 0) {
-                for (Iterator it = getStreamHosts().iterator(); it.hasNext();) {
+                for (StreamHost host : streamHosts) {
-                    buf.append(((StreamHost) it.next()).toXML());
+                    buf.append(host.toXML());
                 }
             }
         }
@@ -456,32 +458,28 @@ public class Bytestream extends IQ {
      *
      * @author Alexander Wenckus
      */
-    public static class Mode {
+    public enum Mode {
 
         /**
          * A TCP based stream.
          */
-        public static Mode TCP = new Mode("tcp");
+        tcp,
 
         /**
          * A UDP based stream.
          */
-        public static Mode UDP = new Mode("udp");
+        udp;
 
-        private final String modeString;
+        public static Mode fromName(String name) {
+            Mode mode;
+            try {
+                mode = Mode.valueOf(name);
+            }
+            catch(Exception ex) {
+                mode = tcp;
+            }
 
-        private Mode(final String mode) {
+            return mode;
-            this.modeString = mode;
-        }
-
-        public String toString() {
-            return modeString;
-        }
-
-        public boolean equals(final Object obj) {
-            if (!(obj instanceof Mode))
-                return false;
-            return modeString.equals(((Mode) obj).modeString);
         }
     }
 }

source/org/jivesoftware/smackx/provider/BytestreamsProvider.java

@@ -33,21 +33,10 @@ public class BytestreamsProvider implements IQProvider {
 
 	/*
 	 * (non-Javadoc)
-	 * 
+	 *
-	 * @see org.jivesoftware.smack.provider.IQProvider#parseIQ(org.xmlpull.v1.XmlPullParser)
-	 */
-	/*
-	 * (non-Javadoc)
-	 * 
-	 * @see org.jivesoftware.smack.provider.IQProvider#parseIQ(org.xmlpull.v1.XmlPullParser)
-	 */
-	/*
-	 * (non-Javadoc)
-	 * 
 	 * @see org.jivesoftware.smack.provider.IQProvider#parseIQ(org.xmlpull.v1.XmlPullParser)
 	 */
 	public IQ parseIQ(XmlPullParser parser) throws Exception {
-		// StringBuilder buf = new StringBuilder();
 		boolean done = false;
 
 		Bytestream toReturn = new Bytestream();
@@ -95,8 +84,7 @@ public class BytestreamsProvider implements IQProvider {
 			}
 		}
 
-		toReturn.setMode((mode == "udp" ? Bytestream.Mode.UDP
+		toReturn.setMode((Bytestream.Mode.fromName(mode)));
-				: Bytestream.Mode.TCP));
 		toReturn.setSessionID(id);
 		return toReturn;
 	}