Introduce packet.Element

Re-work filetransfer/bytestream stanza toXML() method to use
XmlStringBuilder. Move the ELEMENT and NAMESPACE definitions in the
right place, ie. the stanza class.

smack-core/src/main/java/org/jivesoftware/smack/packet/Element.java

@@ -0,0 +1,39 @@
+/**
+ *
+ * Copyright © 2014 Florian Schmaus
+ *
+ * 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.smack.packet;
+
+/**
+ * Interface to represent a XML element. This is similar to {@link PacketExtension}, but does not
+ * carry a namespace and is usually included as child element of an packet extension.
+ */
+public interface Element {
+
+    /**
+     * Returns the root element name.
+     *
+     * @return the element name.
+     */
+    public String getElementName();
+
+    /**
+     * Returns the XML representation of the PacketExtension.
+     *
+     * @return the packet extension as XML.
+     */
+    public CharSequence toXML();
+}

smack-core/src/main/java/org/jivesoftware/smack/packet/IQ.java

@@ -40,6 +40,8 @@ import org.jivesoftware.smack.util.XmlStringBuilder;
  */
 public abstract class IQ extends Packet {
 
+    public static final String QUERY_ELEMENT = "query";
+
     private Type type = Type.get;
 
     public IQ() {

smack-core/src/main/java/org/jivesoftware/smack/packet/PacketExtension.java

@@ -28,14 +28,7 @@ package org.jivesoftware.smack.packet;
  * @see org.jivesoftware.smack.provider.PacketExtensionProvider
  * @author Matt Tucker
  */
-public interface PacketExtension {
+public interface PacketExtension extends Element {
-
-    /**
-     * Returns the root element name.
-     *
-     * @return the element name.
-     */
-    public String getElementName();
 
     /**
      * Returns the root element XML namespace.
@@ -44,10 +37,4 @@ public interface PacketExtension {
      */
     public String getNamespace();
 
-    /**
-     * Returns the XML representation of the PacketExtension.
-     *
-     * @return the packet extension as XML.
-     */
-    public CharSequence toXML();
 }

smack-core/src/main/java/org/jivesoftware/smack/util/XmlStringBuilder.java

@@ -16,6 +16,7 @@
  */
 package org.jivesoftware.smack.util;
 
+import org.jivesoftware.smack.packet.Element;
 import org.jivesoftware.smack.packet.PacketExtension;
 
 public class XmlStringBuilder implements Appendable, CharSequence {
@@ -32,6 +33,11 @@ public class XmlStringBuilder implements Appendable, CharSequence {
         prelude(pe);
     }
 
+    public XmlStringBuilder(Element e) {
+        this();
+        halfOpenElement(e.getElementName());
+    }
+
     /**
      * Does nothing if content is null.
      *
@@ -83,8 +89,8 @@ public class XmlStringBuilder implements Appendable, CharSequence {
         return this;
     }
 
-    public XmlStringBuilder closeElement(PacketExtension pe) {
+    public XmlStringBuilder closeElement(Element e) {
-        closeElement(pe.getElementName());
+        closeElement(e.getElementName());
         return this;
     }
 

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/InBandBytestreamManager.java

@@ -131,11 +131,6 @@ public class InBandBytestreamManager implements BytestreamManager {
         });
     }
 
-    /**
-     * The XMPP namespace of the In-Band Bytestream
-     */
-    public static final String NAMESPACE = "http://jabber.org/protocol/ibb";
-
     /**
      * Maximum block size that is allowed for In-Band Bytestreams
      */

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/InBandBytestreamSession.java

@@ -451,8 +451,8 @@ public class InBandBytestreamSession implements BytestreamSession {
                 public void processPacket(Packet packet) throws NotConnectedException {
                     // get data packet extension
                     DataPacketExtension data = (DataPacketExtension) packet.getExtension(
-                                    DataPacketExtension.ELEMENT_NAME,
+                                    DataPacketExtension.ELEMENT,
-                                    InBandBytestreamManager.NAMESPACE);
+                                    DataPacketExtension.NAMESPACE);
 
                     /*
                      * check if sequence was not used already (see XEP-0047 Section 2.2)
@@ -514,8 +514,8 @@ public class InBandBytestreamSession implements BytestreamSession {
                 public void processPacket(Packet packet) {
                     // get data packet extension
                     DataPacketExtension data = (DataPacketExtension) packet.getExtension(
-                                    DataPacketExtension.ELEMENT_NAME,
+                                    DataPacketExtension.ELEMENT,
-                                    InBandBytestreamManager.NAMESPACE);
+                                    DataPacketExtension.NAMESPACE);
 
                     // check if encoded data is valid
                     if (data.getDecodedData() == null) {
@@ -563,8 +563,8 @@ public class InBandBytestreamSession implements BytestreamSession {
             }
 
             // stanza contains data packet extension
-            PacketExtension packetExtension = packet.getExtension(DataPacketExtension.ELEMENT_NAME,
+            PacketExtension packetExtension = packet.getExtension(DataPacketExtension.ELEMENT,
-                            InBandBytestreamManager.NAMESPACE);
+                            DataPacketExtension.NAMESPACE);
             if (packetExtension == null || !(packetExtension instanceof DataPacketExtension)) {
                 return false;
             }

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/packet/Close.java

@@ -17,7 +17,7 @@
 package org.jivesoftware.smackx.bytestreams.ibb.packet;
 
 import org.jivesoftware.smack.packet.IQ;
-import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager;
+import org.jivesoftware.smack.util.XmlStringBuilder;
 
 /**
  * Represents a request to close an In-Band Bytestream.
@@ -26,6 +26,8 @@ import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager;
  */
 public class Close extends IQ {
 
+    public static final String ELEMENT = "close";
+
     /* unique session ID identifying this In-Band Bytestream */
     private final String sessionID;
 
@@ -52,17 +54,13 @@ public class Close extends IQ {
     }
 
     @Override
-    public String getChildElementXML() {
+    public XmlStringBuilder getChildElementXML() {
-        StringBuilder buf = new StringBuilder();
+        XmlStringBuilder xml = new XmlStringBuilder();
-        buf.append("<close ");
+        xml.halfOpenElement(ELEMENT);
-        buf.append("xmlns=\"");
+        xml.xmlnsAttribute(DataPacketExtension.NAMESPACE);
-        buf.append(InBandBytestreamManager.NAMESPACE);
+        xml.attribute("sid", sessionID);
-        buf.append("\" ");
+        xml.closeEmptyElement();
-        buf.append("sid=\"");
+        return xml;
-        buf.append(sessionID);
-        buf.append("\"");
-        buf.append("/>");
-        return buf.toString();
     }
 
 }

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/packet/Data.java

@@ -17,6 +17,7 @@
 package org.jivesoftware.smackx.bytestreams.ibb.packet;
 
 import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smack.util.XmlStringBuilder;
 
 /**
  * Represents a chunk of data sent over an In-Band Bytestream encapsulated in an
@@ -60,8 +61,9 @@ public class Data extends IQ {
         return this.dataPacketExtension;
     }
 
-    public String getChildElementXML() {
+    @Override
-        return this.dataPacketExtension.toXML();
+    public XmlStringBuilder getChildElementXML() {
+        return dataPacketExtension.toXML();
     }
 
 }

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/packet/DataPacketExtension.java

@@ -18,7 +18,7 @@ package org.jivesoftware.smackx.bytestreams.ibb.packet;
 
 import org.jivesoftware.smack.packet.PacketExtension;
 import org.jivesoftware.smack.util.StringUtils;
-import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager;
+import org.jivesoftware.smack.util.XmlStringBuilder;
 
 /**
  * Represents a chunk of data of an In-Band Bytestream within an IQ stanza or a
@@ -31,7 +31,12 @@ public class DataPacketExtension implements PacketExtension {
     /**
      * The element name of the data packet extension.
      */
-    public final static String ELEMENT_NAME = "data";
+    public final static String ELEMENT = "data";
+
+    /**
+     * The XMPP namespace of the In-Band Bytestream
+     */
+    public static final String NAMESPACE = "http://jabber.org/protocol/ibb";
 
     /* unique session ID identifying this In-Band Bytestream */
     private final String sessionID;
@@ -121,32 +126,22 @@ public class DataPacketExtension implements PacketExtension {
     }
 
     public String getElementName() {
-        return ELEMENT_NAME;
+        return ELEMENT;
     }
 
     public String getNamespace() {
-        return InBandBytestreamManager.NAMESPACE;
+        return NAMESPACE;
     }
 
-    public String toXML() {
+    @Override
-        StringBuilder buf = new StringBuilder();
+    public XmlStringBuilder toXML() {
-        buf.append("<");
+        XmlStringBuilder xml = new XmlStringBuilder(this);
-        buf.append(getElementName());
+        xml.attribute("seq", Long.toString(seq));
-        buf.append(" ");
+        xml.attribute("sid", sessionID);
-        buf.append("xmlns=\"");
+        xml.rightAngelBracket();
-        buf.append(InBandBytestreamManager.NAMESPACE);
+        xml.append(data);
-        buf.append("\" ");
+        xml.closeElement(this);
-        buf.append("seq=\"");
+        return xml;
-        buf.append(seq);
-        buf.append("\" ");
-        buf.append("sid=\"");
-        buf.append(sessionID);
-        buf.append("\">");
-        buf.append(data);
-        buf.append("</");
-        buf.append(getElementName());
-        buf.append(">");
-        return buf.toString();
     }
 
 }

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/ibb/packet/Open.java

@@ -19,7 +19,7 @@ package org.jivesoftware.smackx.bytestreams.ibb.packet;
 import java.util.Locale;
 
 import org.jivesoftware.smack.packet.IQ;
-import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager;
+import org.jivesoftware.smack.util.XmlStringBuilder;
 import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager.StanzaType;
 
 /**
@@ -29,6 +29,8 @@ import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager.StanzaTyp
  */
 public class Open extends IQ {
 
+    public static final String ELEMENT = "open";
+
     /* unique session ID identifying this In-Band Bytestream */
     private final String sessionID;
 
@@ -109,23 +111,15 @@ public class Open extends IQ {
     }
 
     @Override
-    public String getChildElementXML() {
+    public XmlStringBuilder getChildElementXML() {
-        StringBuilder buf = new StringBuilder();
+        XmlStringBuilder xml = new XmlStringBuilder();
-        buf.append("<open ");
+        xml.halfOpenElement(ELEMENT);
-        buf.append("xmlns=\"");
+        xml.xmlnsAttribute(DataPacketExtension.NAMESPACE);
-        buf.append(InBandBytestreamManager.NAMESPACE);
+        xml.attribute("block-size", Integer.toString(blockSize));
-        buf.append("\" ");
+        xml.attribute("sid", sessionID);
-        buf.append("block-size=\"");
+        xml.attribute("stanza", stanza.toString().toLowerCase(Locale.US));
-        buf.append(blockSize);
+        xml.closeEmptyElement();
-        buf.append("\" ");
+        return xml;
-        buf.append("sid=\"");
-        buf.append(sessionID);
-        buf.append("\" ");
-        buf.append("stanza=\"");
-        buf.append(stanza.toString().toLowerCase(Locale.US));
-        buf.append("\"");
-        buf.append("/>");
-        return buf.toString();
     }
 
 }

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/Socks5BytestreamManager.java

@@ -125,11 +125,6 @@ public final class Socks5BytestreamManager implements BytestreamManager {
         });
     }
 
-    /**
-     * The XMPP namespace of the SOCKS5 Bytestream
-     */
-    public static final String NAMESPACE = "http://jabber.org/protocol/bytestreams";
-
     /* prefix used to generate session IDs */
     private static final String SESSION_ID_PREFIX = "js5_";
 
@@ -322,7 +317,7 @@ public final class Socks5BytestreamManager implements BytestreamManager {
 
         // check if service discovery is not already disposed by connection shutdown
         if (serviceDiscoveryManager != null) {
-            serviceDiscoveryManager.removeFeature(NAMESPACE);
+            serviceDiscoveryManager.removeFeature(Bytestream.NAMESPACE);
         }
 
     }
@@ -540,7 +535,7 @@ public final class Socks5BytestreamManager implements BytestreamManager {
      * @throws NotConnectedException 
      */
     private boolean supportsSocks5(String targetJID) throws NoResponseException, XMPPErrorException, NotConnectedException {
-        return ServiceDiscoveryManager.getInstanceFor(connection).supportsFeature(targetJID, NAMESPACE);
+        return ServiceDiscoveryManager.getInstanceFor(connection).supportsFeature(targetJID, Bytestream.NAMESPACE);
     }
 
     /**
@@ -732,9 +727,7 @@ public final class Socks5BytestreamManager implements BytestreamManager {
      */
     private void enableService() {
         ServiceDiscoveryManager manager = ServiceDiscoveryManager.getInstanceFor(this.connection);
-        if (!manager.includesFeature(NAMESPACE)) {
+        manager.addFeature(Bytestream.NAMESPACE);
-            manager.addFeature(NAMESPACE);
-        }
     }
 
     /**

smack-extensions/src/main/java/org/jivesoftware/smackx/bytestreams/socks5/packet/Bytestream.java

@@ -21,8 +21,9 @@ import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 
+import org.jivesoftware.smack.packet.Element;
 import org.jivesoftware.smack.packet.IQ;
-import org.jivesoftware.smack.packet.PacketExtension;
+import org.jivesoftware.smack.util.XmlStringBuilder;
 
 /**
  * A packet representing part of a SOCKS5 Bytestream negotiation.
@@ -30,6 +31,10 @@ import org.jivesoftware.smack.packet.PacketExtension;
  * @author Alexander Wenckus
  */
 public class Bytestream extends IQ {
+    /**
+     * The XMPP namespace of the SOCKS5 Bytestream
+     */
+    public static final String NAMESPACE = "http://jabber.org/protocol/bytestreams";
 
     private String sessionID;
 
@@ -213,48 +218,51 @@ public class Bytestream extends IQ {
         this.toActivate = new Activate(targetID);
     }
 
-    public String getChildElementXML() {
+    @Override
-        StringBuilder buf = new StringBuilder();
+    public XmlStringBuilder getChildElementXML() {
+        XmlStringBuilder xml = new XmlStringBuilder();
+        xml.openElement(IQ.QUERY_ELEMENT);
+        xml.xmlnsAttribute(NAMESPACE);
 
-        buf.append("<query xmlns=\"http://jabber.org/protocol/bytestreams\"");
+        switch(getType()) {
-        if (this.getType().equals(IQ.Type.set)) {
+        case set:
             if (getSessionID() != null) {
-                buf.append(" sid=\"").append(getSessionID()).append("\"");
+                xml.attribute("sid", getSessionID());
             }
             if (getMode() != null) {
-                buf.append(" mode = \"").append(getMode()).append("\"");
+                xml.attribute("mode", getMode());
             }
-            buf.append(">");
+            xml.rightAngelBracket();
             if (getToActivate() == null) {
                 for (StreamHost streamHost : getStreamHosts()) {
-                    buf.append(streamHost.toXML());
+                    xml.append(streamHost.toXML());
                 }
             }
             else {
-                buf.append(getToActivate().toXML());
+                xml.append(getToActivate().toXML());
             }
-        }
+            break;
-        else if (this.getType().equals(IQ.Type.result)) {
+        case result:
-            buf.append(">");
+            xml.rightAngelBracket();
             if (getUsedHost() != null) {
-                buf.append(getUsedHost().toXML());
+                xml.append(getUsedHost().toXML());
             }
             // A result from the server can also contain stream hosts
             else if (countStreamHosts() > 0) {
                 for (StreamHost host : streamHosts) {
-                    buf.append(host.toXML());
+                    xml.append(host.toXML());
                 }
             }
+            break;
+        case get:
+            xml.closeEmptyElement();
+            return xml;
+        default:
+            throw new IllegalStateException();
         }
-        else if (this.getType().equals(IQ.Type.get)) {
+        xml.closeElement(IQ.QUERY_ELEMENT);
-            return buf.append("/>").toString();
-        }
-        else {
-            return null;
-        }
-        buf.append("</query>");
 
-        return buf.toString();
+        return xml;
     }
 
     /**
@@ -263,9 +271,7 @@ public class Bytestream extends IQ {
      * 
      * @author Alexander Wenckus
      */
-    public static class StreamHost implements PacketExtension {
+    public static class StreamHost implements Element {
-
-        public static String NAMESPACE = "";
 
         public static String ELEMENTNAME = "streamhost";
 
@@ -322,29 +328,22 @@ public class Bytestream extends IQ {
             return port;
         }
 
-        public String getNamespace() {
-            return NAMESPACE;
-        }
-
         public String getElementName() {
             return ELEMENTNAME;
         }
 
-        public String toXML() {
+        @Override
-            StringBuilder buf = new StringBuilder();
+        public XmlStringBuilder toXML() {
-
+            XmlStringBuilder xml = new XmlStringBuilder(this);
-            buf.append("<").append(getElementName()).append(" ");
+            xml.attribute("jid", getJID());
-            buf.append("jid=\"").append(getJID()).append("\" ");
+            xml.attribute("host", getAddress());
-            buf.append("host=\"").append(getAddress()).append("\" ");
             if (getPort() != 0) {
-                buf.append("port=\"").append(getPort()).append("\"");
+                xml.attribute("port", Integer.toString(getPort()));
+            } else {
+                xml.attribute("zeroconf", "_jabber.bytestreams");
             }
-            else {
+            xml.closeEmptyElement();
-                buf.append("zeroconf=\"_jabber.bytestreams\"");
+            return xml;
-            }
-            buf.append("/>");
-
-            return buf.toString();
         }
     }
 
@@ -354,9 +353,7 @@ public class Bytestream extends IQ {
      * 
      * @author Alexander Wenckus
      */
-    public static class StreamHostUsed implements PacketExtension {
+    public static class StreamHostUsed implements Element {
-
-        public String NAMESPACE = "";
 
         public static String ELEMENTNAME = "streamhost-used";
 
@@ -380,20 +377,16 @@ public class Bytestream extends IQ {
             return JID;
         }
 
-        public String getNamespace() {
-            return NAMESPACE;
-        }
-
         public String getElementName() {
             return ELEMENTNAME;
         }
 
-        public String toXML() {
+        @Override
-            StringBuilder buf = new StringBuilder();
+        public XmlStringBuilder toXML() {
-            buf.append("<").append(getElementName()).append(" ");
+            XmlStringBuilder xml = new XmlStringBuilder(this);
-            buf.append("jid=\"").append(getJID()).append("\" ");
+            xml.attribute("jid", getJID());
-            buf.append("/>");
+            xml.closeEmptyElement();
-            return buf.toString();
+            return xml;
         }
     }
 
@@ -402,9 +395,7 @@ public class Bytestream extends IQ {
      * 
      * @author Alexander Wenckus
      */
-    public static class Activate implements PacketExtension {
+    public static class Activate implements Element {
-
-        public String NAMESPACE = "";
 
         public static String ELEMENTNAME = "activate";
 
@@ -428,20 +419,17 @@ public class Bytestream extends IQ {
             return target;
         }
 
-        public String getNamespace() {
-            return NAMESPACE;
-        }
-
         public String getElementName() {
             return ELEMENTNAME;
         }
 
-        public String toXML() {
+        @Override
-            StringBuilder buf = new StringBuilder();
+        public XmlStringBuilder toXML() {
-            buf.append("<").append(getElementName()).append(">");
+            XmlStringBuilder xml = new XmlStringBuilder(this);
-            buf.append(getTarget());
+            xml.rightAngelBracket();
-            buf.append("</").append(getElementName()).append(">");
+            xml.escape(getTarget());
-            return buf.toString();
+            xml.closeElement(this);
+            return xml;
         }
     }
 

smack-extensions/src/main/java/org/jivesoftware/smackx/disco/ServiceDiscoveryManager.java

@@ -405,8 +405,10 @@ public class ServiceDiscoveryManager extends Manager {
      */
     public void addFeature(String feature) {
         synchronized (features) {
-            features.add(feature);
+            if (!features.contains(feature)) {
-            renewEntityCapsVersion();
+                features.add(feature);
+                renewEntityCapsVersion();
+            }
         }
     }
 

smack-extensions/src/main/java/org/jivesoftware/smackx/filetransfer/FileTransferNegotiator.java

@@ -34,8 +34,8 @@ import org.jivesoftware.smack.XMPPException.XMPPErrorException;
 import org.jivesoftware.smack.packet.IQ;
 import org.jivesoftware.smack.packet.Packet;
 import org.jivesoftware.smack.packet.XMPPError;
-import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager;
+import org.jivesoftware.smackx.bytestreams.ibb.packet.DataPacketExtension;
-import org.jivesoftware.smackx.bytestreams.socks5.Socks5BytestreamManager;
+import org.jivesoftware.smackx.bytestreams.socks5.packet.Bytestream;
 import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
 import org.jivesoftware.smackx.si.packet.StreamInitiation;
 import org.jivesoftware.smackx.xdata.Form;
@@ -103,9 +103,9 @@ public class FileTransferNegotiator extends Manager {
 
         List<String> namespaces = new ArrayList<String>();
         namespaces.addAll(Arrays.asList(NAMESPACE));
-        namespaces.add(InBandBytestreamManager.NAMESPACE);
+        namespaces.add(DataPacketExtension.NAMESPACE);
         if (!IBB_ONLY) {
-            namespaces.add(Socks5BytestreamManager.NAMESPACE);
+            namespaces.add(Bytestream.NAMESPACE);
         }
 
         for (String namespace : namespaces) {
@@ -130,9 +130,9 @@ public class FileTransferNegotiator extends Manager {
 
         List<String> namespaces = new ArrayList<String>();
         namespaces.addAll(Arrays.asList(NAMESPACE));
-        namespaces.add(InBandBytestreamManager.NAMESPACE);
+        namespaces.add(DataPacketExtension.NAMESPACE);
         if (!IBB_ONLY) {
-            namespaces.add(Socks5BytestreamManager.NAMESPACE);
+            namespaces.add(Bytestream.NAMESPACE);
         }
 
         for (String namespace : namespaces) {
@@ -150,9 +150,9 @@ public class FileTransferNegotiator extends Manager {
      */
     public static Collection<String> getSupportedProtocols() {
         List<String> protocols = new ArrayList<String>();
-        protocols.add(InBandBytestreamManager.NAMESPACE);
+        protocols.add(DataPacketExtension.NAMESPACE);
         if (!IBB_ONLY) {
-            protocols.add(Socks5BytestreamManager.NAMESPACE);
+            protocols.add(Bytestream.NAMESPACE);
         }
         return Collections.unmodifiableList(protocols);
     }
@@ -227,10 +227,10 @@ public class FileTransferNegotiator extends Manager {
         boolean isIBB = false;
         for (FormField.Option option : field.getOptions()) {
             variable = option.getValue();
-            if (variable.equals(Socks5BytestreamManager.NAMESPACE) && !IBB_ONLY) {
+            if (variable.equals(Bytestream.NAMESPACE) && !IBB_ONLY) {
                 isByteStream = true;
             }
-            else if (variable.equals(InBandBytestreamManager.NAMESPACE)) {
+            else if (variable.equals(DataPacketExtension.NAMESPACE)) {
                 isIBB = true;
             }
         }
@@ -354,10 +354,10 @@ public class FileTransferNegotiator extends Manager {
         boolean isByteStream = false;
         boolean isIBB = false;
         for (String variable : field.getValues()) {
-            if (variable.equals(Socks5BytestreamManager.NAMESPACE) && !IBB_ONLY) {
+            if (variable.equals(Bytestream.NAMESPACE) && !IBB_ONLY) {
                 isByteStream = true;
             }
-            else if (variable.equals(InBandBytestreamManager.NAMESPACE)) {
+            else if (variable.equals(DataPacketExtension.NAMESPACE)) {
                 isIBB = true;
             }
         }
@@ -385,9 +385,9 @@ public class FileTransferNegotiator extends Manager {
         FormField field = new FormField(STREAM_DATA_FIELD_NAME);
         field.setType(FormField.TYPE_LIST_SINGLE);
         if (!IBB_ONLY) {
-            field.addOption(new FormField.Option(Socks5BytestreamManager.NAMESPACE));
+            field.addOption(new FormField.Option(Bytestream.NAMESPACE));
         }
-        field.addOption(new FormField.Option(InBandBytestreamManager.NAMESPACE));
+        field.addOption(new FormField.Option(DataPacketExtension.NAMESPACE));
         form.addField(field);
         return form;
     }

smack-extensions/src/main/java/org/jivesoftware/smackx/filetransfer/IBBTransferNegotiator.java

@@ -32,6 +32,7 @@ import org.jivesoftware.smack.packet.Packet;
 import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager;
 import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamRequest;
 import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamSession;
+import org.jivesoftware.smackx.bytestreams.ibb.packet.DataPacketExtension;
 import org.jivesoftware.smackx.bytestreams.ibb.packet.Open;
 import org.jivesoftware.smackx.si.packet.StreamInitiation;
 
@@ -92,7 +93,7 @@ public class IBBTransferNegotiator extends StreamNegotiator {
     }
 
     public String[] getNamespaces() {
-        return new String[] { InBandBytestreamManager.NAMESPACE };
+        return new String[] { DataPacketExtension.NAMESPACE };
     }
 
     InputStream negotiateIncomingStream(Packet streamInitiation) throws NotConnectedException {

smack-extensions/src/main/java/org/jivesoftware/smackx/filetransfer/Socks5TransferNegotiator.java

@@ -97,7 +97,7 @@ public class Socks5TransferNegotiator extends StreamNegotiator {
 
     @Override
     public String[] getNamespaces() {
-        return new String[] { Socks5BytestreamManager.NAMESPACE };
+        return new String[] { Bytestream.NAMESPACE };
     }
 
     @Override

smack-extensions/src/test/java/org/jivesoftware/smackx/bytestreams/ibb/InBandBytestreamSessionMessageTest.java

@@ -99,7 +99,7 @@ public class InBandBytestreamSessionMessageTest {
 
             public void verify(Message request, IQ response) {
                 DataPacketExtension dpe = (DataPacketExtension) request.getExtension(
-                                DataPacketExtension.ELEMENT_NAME, InBandBytestreamManager.NAMESPACE);
+                                DataPacketExtension.ELEMENT, DataPacketExtension.NAMESPACE);
                 assertEquals(lastSeq++, dpe.getSeq());
             }
 

smack-extensions/src/test/java/org/jivesoftware/smackx/bytestreams/ibb/packet/DataPacketExtensionTest.java

@@ -93,7 +93,7 @@ public class DataPacketExtensionTest {
             .asString(outputProperties);
 
         DataPacketExtension data = new DataPacketExtension("i781hf64", 0, "DATA");
-        assertXMLEqual(control, data.toXML());
+        assertXMLEqual(control, data.toXML().toString());
     }
 
 }

smack-extensions/src/test/java/org/jivesoftware/smackx/bytestreams/ibb/packet/DataTest.java

@@ -18,13 +18,13 @@ package org.jivesoftware.smackx.bytestreams.ibb.packet;
 
 import static org.custommonkey.xmlunit.XMLAssert.assertXMLEqual;
 import static org.junit.Assert.assertEquals;
-
 import static org.mockito.Mockito.*;
 
 import java.util.Properties;
 
 import org.jivesoftware.smack.packet.IQ;
 import org.jivesoftware.smack.util.StringUtils;
+import org.jivesoftware.smack.util.XmlStringBuilder;
 import org.jivesoftware.smackx.bytestreams.ibb.packet.Data;
 import org.jivesoftware.smackx.bytestreams.ibb.packet.DataPacketExtension;
 import org.junit.Test;
@@ -72,12 +72,14 @@ public class DataTest {
             .asString(outputProperties);
 
         DataPacketExtension dpe = mock(DataPacketExtension.class);
-        String dataTag = XMLBuilder.create("data")
+        XmlStringBuilder dataTag = new XmlStringBuilder();
-            .a("xmlns", "http://jabber.org/protocol/ibb")
+        dataTag.halfOpenElement(DataPacketExtension.ELEMENT);
-            .a("seq", "0")
+        dataTag.xmlnsAttribute(DataPacketExtension.NAMESPACE);
-            .a("sid", "i781hf64")
+        dataTag.attribute("seq", "0");
-            .t(encodedData)
+        dataTag.attribute("sid", "i781hf64");
-            .asString(outputProperties);
+        dataTag.rightAngelBracket();
+        dataTag.escape(encodedData);
+        dataTag.closeElement(DataPacketExtension.ELEMENT);
         when(dpe.toXML()).thenReturn(dataTag);
         Data data = new Data(dpe);
         data.setFrom("romeo@montague.lit/orchard");

smack-extensions/src/test/java/org/jivesoftware/smackx/bytestreams/socks5/Socks5ByteStreamManagerTest.java

@@ -127,11 +127,11 @@ public class Socks5ByteStreamManagerTest {
         Socks5BytestreamManager byteStreamManager = Socks5BytestreamManager.getBytestreamManager(connection);
         ServiceDiscoveryManager discoveryManager = ServiceDiscoveryManager.getInstanceFor(connection);
 
-        assertTrue(discoveryManager.includesFeature(Socks5BytestreamManager.NAMESPACE));
+        assertTrue(discoveryManager.includesFeature(Bytestream.NAMESPACE));
 
         byteStreamManager.disableService();
 
-        assertFalse(discoveryManager.includesFeature(Socks5BytestreamManager.NAMESPACE));
+        assertFalse(discoveryManager.includesFeature(Bytestream.NAMESPACE));
     }
 
     /**
@@ -182,7 +182,7 @@ public class Socks5ByteStreamManagerTest {
 
         // build discover info that supports the SOCKS5 feature
         DiscoverInfo discoverInfo = Socks5PacketUtils.createDiscoverInfo(targetJID, initiatorJID);
-        discoverInfo.addFeature(Socks5BytestreamManager.NAMESPACE);
+        discoverInfo.addFeature(Bytestream.NAMESPACE);
 
         // return that SOCKS5 is supported if target is queried
         protocol.addResponse(discoverInfo, Verification.correspondingSenderReceiver,
@@ -233,7 +233,7 @@ public class Socks5ByteStreamManagerTest {
 
         // build discover info that supports the SOCKS5 feature
         DiscoverInfo discoverInfo = Socks5PacketUtils.createDiscoverInfo(targetJID, initiatorJID);
-        discoverInfo.addFeature(Socks5BytestreamManager.NAMESPACE);
+        discoverInfo.addFeature(Bytestream.NAMESPACE);
 
         // return that SOCKS5 is supported if target is queried
         protocol.addResponse(discoverInfo, Verification.correspondingSenderReceiver,
@@ -297,7 +297,7 @@ public class Socks5ByteStreamManagerTest {
 
         // build discover info that supports the SOCKS5 feature
         DiscoverInfo discoverInfo = Socks5PacketUtils.createDiscoverInfo(targetJID, initiatorJID);
-        discoverInfo.addFeature(Socks5BytestreamManager.NAMESPACE);
+        discoverInfo.addFeature(Bytestream.NAMESPACE);
 
         // return that SOCKS5 is supported if target is queried
         protocol.addResponse(discoverInfo, Verification.correspondingSenderReceiver,
@@ -388,7 +388,7 @@ public class Socks5ByteStreamManagerTest {
 
         // build discover info that supports the SOCKS5 feature
         DiscoverInfo discoverInfo = Socks5PacketUtils.createDiscoverInfo(targetJID, initiatorJID);
-        discoverInfo.addFeature(Socks5BytestreamManager.NAMESPACE);
+        discoverInfo.addFeature(Bytestream.NAMESPACE);
 
         // return that SOCKS5 is supported if target is queried
         protocol.addResponse(discoverInfo, Verification.correspondingSenderReceiver,
@@ -478,7 +478,7 @@ public class Socks5ByteStreamManagerTest {
 
         // build discover info that supports the SOCKS5 feature
         DiscoverInfo discoverInfo = Socks5PacketUtils.createDiscoverInfo(targetJID, initiatorJID);
-        discoverInfo.addFeature(Socks5BytestreamManager.NAMESPACE);
+        discoverInfo.addFeature(Bytestream.NAMESPACE);
 
         // return that SOCKS5 is supported if target is queried
         protocol.addResponse(discoverInfo, Verification.correspondingSenderReceiver,
@@ -560,7 +560,7 @@ public class Socks5ByteStreamManagerTest {
 
         // build discover info that supports the SOCKS5 feature
         DiscoverInfo discoverInfo = Socks5PacketUtils.createDiscoverInfo(targetJID, initiatorJID);
-        discoverInfo.addFeature(Socks5BytestreamManager.NAMESPACE);
+        discoverInfo.addFeature(Bytestream.NAMESPACE);
 
         // return that SOCKS5 is supported if target is queried
         protocol.addResponse(discoverInfo, Verification.correspondingSenderReceiver,
@@ -654,7 +654,7 @@ public class Socks5ByteStreamManagerTest {
 
         // build discover info that supports the SOCKS5 feature
         DiscoverInfo discoverInfo = Socks5PacketUtils.createDiscoverInfo(targetJID, initiatorJID);
-        discoverInfo.addFeature(Socks5BytestreamManager.NAMESPACE);
+        discoverInfo.addFeature(Bytestream.NAMESPACE);
 
         // return that SOCKS5 is supported if target is queried
         protocol.addResponse(discoverInfo, Verification.correspondingSenderReceiver,
@@ -773,7 +773,7 @@ public class Socks5ByteStreamManagerTest {
 
         // build discover info that supports the SOCKS5 feature
         DiscoverInfo discoverInfo = Socks5PacketUtils.createDiscoverInfo(targetJID, initiatorJID);
-        discoverInfo.addFeature(Socks5BytestreamManager.NAMESPACE);
+        discoverInfo.addFeature(Bytestream.NAMESPACE);
 
         // return that SOCKS5 is supported if target is queried
         protocol.addResponse(discoverInfo, Verification.correspondingSenderReceiver,
@@ -1003,7 +1003,7 @@ public class Socks5ByteStreamManagerTest {
     private void createResponses(Verification<Bytestream, Bytestream> streamHostUsedVerification) {
         // build discover info that supports the SOCKS5 feature
         DiscoverInfo discoverInfo = Socks5PacketUtils.createDiscoverInfo(targetJID, initiatorJID);
-        discoverInfo.addFeature(Socks5BytestreamManager.NAMESPACE);
+        discoverInfo.addFeature(Bytestream.NAMESPACE);
 
         // return that SOCKS5 is supported if target is queried
         protocol.addResponse(discoverInfo, Verification.correspondingSenderReceiver,