Added disco support

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@2142 b35dd754-fafc-0310-a699-88a17e54d16e

build/resources/META-INF/smack.providers

@@ -44,4 +44,18 @@
         <className>org.jivesoftware.smackx.GroupChatInvitation$Provider</className>
     </extensionProvider>	
 
+    <!-- Service Discovery # Items -->
+    <iqProvider> 
+        <elementName>query</elementName> 
+        <namespace>http://jabber.org/protocol/disco#items</namespace> 
+        <className>org.jivesoftware.smackx.provider.DiscoverItemsProvider</className> 
+    </iqProvider>
+
+    <!-- Service Discovery # Info -->
+    <iqProvider> 
+        <elementName>query</elementName> 
+        <namespace>http://jabber.org/protocol/disco#info</namespace> 
+        <className>org.jivesoftware.smackx.provider.DiscoverInfoProvider</className> 
+    </iqProvider>
+
 </smackProviders>

source/org/jivesoftware/smackx/XHTMLManager.java

@@ -54,7 +54,10 @@ package org.jivesoftware.smackx;
 
 import java.util.Iterator;
 
+import org.jivesoftware.smack.XMPPConnection;
+import org.jivesoftware.smack.XMPPException;
 import org.jivesoftware.smack.packet.Message;
+import org.jivesoftware.smackx.packet.DiscoverInfo;
 import org.jivesoftware.smackx.packet.XHTMLExtension;
 
 /**
@@ -66,6 +69,8 @@ import org.jivesoftware.smackx.packet.XHTMLExtension;
  */
 public class XHTMLManager {
 
+    private final static String namespace = "http://jabber.org/protocol/xhtml-im";
+
     /**
      * Returns an Iterator for the XHTML bodies in the message. Returns null if 
      * the message does not contain an XHTML extension.
@@ -74,8 +79,7 @@ public class XHTMLManager {
      * @return an Iterator for the bodies in the message or null if none.
      */
     public static Iterator getBodies(Message message) {
-        XHTMLExtension xhtmlExtension =
+        XHTMLExtension xhtmlExtension = (XHTMLExtension) message.getExtension("html", namespace);
-            (XHTMLExtension) message.getExtension("html", "http://jabber.org/protocol/xhtml-im");
         if (xhtmlExtension != null)
             return xhtmlExtension.getBodies();
         else
@@ -89,8 +93,7 @@ public class XHTMLManager {
      * @param body the string to add as an XHTML body to the message
      */
     public static void addBody(Message message, String body) {
-        XHTMLExtension xhtmlExtension =
+        XHTMLExtension xhtmlExtension = (XHTMLExtension) message.getExtension("html", namespace);
-            (XHTMLExtension) message.getExtension("html", "http://jabber.org/protocol/xhtml-im");
         if (xhtmlExtension == null) {
             // Create an XHTMLExtension and add it to the message
             xhtmlExtension = new XHTMLExtension();
@@ -107,7 +110,54 @@ public class XHTMLManager {
      * @return a boolean indicating whether the message is an XHTML message
      */
     public static boolean isXHTMLMessage(Message message) {
-        return message.getExtension("html", "http://jabber.org/protocol/xhtml-im") != null;
+        return message.getExtension("html", namespace) != null;
     }
 
+    /**
+     * Enables or disables the XHTML support on a given connection.<p>
+     *  
+     * Before starting to send XHTML messages to a user, check that the user can handle XHTML
+     * messages. Enable the XHTML support to indicate that this client handles XHTML messages.  
+     *
+     * @param connection the connection where the service will be enabled or disabled
+     * @param enabled indicates if the service will be enabled or disabled 
+     */
+    public synchronized static void setServiceEnabled(XMPPConnection connection, boolean enabled) {
+        if (isServiceEnabled(connection) == enabled)
+            return;
+
+        if (enabled) {
+            ServiceDiscoveryManager.getInstanceFor(connection).addFeature(namespace);
+        } else {
+            ServiceDiscoveryManager.getInstanceFor(connection).removeFeature(namespace);
+        }
+    }
+
+    /**
+     * Returns true if the XHTML support is enabled for the given connection.
+     *
+     * @param connection the connection to look for XHTML support
+     * @return a boolean indicating if the XHTML support is enabled for the given connection
+     */
+    public static boolean isServiceEnabled(XMPPConnection connection) {
+        return ServiceDiscoveryManager.getInstanceFor(connection).includesFeature(namespace);
+    }
+
+    /**
+     * Returns true if the specified user handles XHTML messages.
+     *
+     * @param connection the connection to use to perform the service discovery
+     * @param userID the user to check. A fully qualified xmpp ID, e.g. jdoe@example.com
+     * @return a boolean indicating whether the specified user handles XHTML messages
+     */
+    public static boolean isServiceEnabled(XMPPConnection connection, String userID) {
+        try {
+            DiscoverInfo result =
+                ServiceDiscoveryManager.getInstanceFor(connection).discoverInfo(userID);
+            return result.containsFeature(namespace);
+        } catch (XMPPException e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
 }