Announce support for vcard-temp/XEP-54

Add VCardManager to setup the vcard-temp feature. Fixes SMACK-414.

extensions/src/main/java/org/jivesoftware/smackx/vcardtemp/VCardManager.java

@@ -0,0 +1,48 @@
+/**
+ *
+ * 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.smackx.vcardtemp;
+
+import org.jivesoftware.smack.ConnectionCreationListener;
+import org.jivesoftware.smack.XMPPConnection;
+import org.jivesoftware.smack.XMPPException;
+import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
+
+public class VCardManager {
+    public static final String NAMESPACE = "vcard-temp";
+    public static final String ELEMENT = "vCard";
+
+    static {
+        XMPPConnection.addConnectionCreationListener(new ConnectionCreationListener() {
+            @Override
+            public void connectionCreated(XMPPConnection connection) {
+                ServiceDiscoveryManager.getInstanceFor(connection).addFeature(NAMESPACE);
+            }
+        });
+    }
+
+    /**
+     * Returns true if the given entity understands the vCard-XML format and allows the exchange of such.
+     * 
+     * @param jid
+     * @param connection
+     * @return true if the given entity understands the vCard-XML format and exchange.
+     * @throws XMPPException If there was an exception while determining the support.
+     */
+    public static boolean isSupported(String jid, XMPPConnection connection) throws XMPPException {
+        return ServiceDiscoveryManager.getInstanceFor(connection).supportsFeature(jid, NAMESPACE);
+    }
+}

extensions/src/main/java/org/jivesoftware/smackx/vcardtemp/packet/VCard.java

@@ -37,6 +37,7 @@ import org.jivesoftware.smack.XMPPConnection;
 import org.jivesoftware.smack.XMPPException;
 import org.jivesoftware.smack.packet.IQ;
 import org.jivesoftware.smack.util.StringUtils;
+import org.jivesoftware.smackx.vcardtemp.VCardManager;
 
 /**
  * A VCard class for use with the
@@ -692,7 +693,7 @@ public class VCard extends IQ {
         }
 
         public void write() {
-            appendTag("vCard", "xmlns", "vcard-temp", hasContent(), new ContentBuilder() {
+            appendTag(VCardManager.ELEMENT, "xmlns", VCardManager.NAMESPACE, hasContent(), new ContentBuilder() {
                 public void addTagContent() {
                     buildActualContent();
                 }

extensions/src/main/resources/org.jivesoftware.smackx/extensions.xml

@@ -11,5 +11,6 @@
         <className>org.jivesoftware.smackx.ping.PingManager</className>
         <className>org.jivesoftware.smackx.privacy.PrivacyListManager</className>
         <className>org.jivesoftware.smackx.time.EntityTimeManager</className>
+        <className>org.jivesoftware.smackx.vcardtemp.VCardManager</className>
     </startupClasses>
 </smack>