Moves RegistrationStateChangeListener to ProtocolProviderServiceSipImpl.

For readability, it makes sense to have the class
(ProtocolProviderServiceSipImpl) calling
SipStackSharing.addSipListener(listener) also call
SipStackSharing.removeSipListener(listener).

src/net/java/sip/communicator/impl/protocol/sip/ProtocolProviderServiceSipImpl.java

@@ -39,7 +39,8 @@
  */
 public class ProtocolProviderServiceSipImpl
   extends AbstractProtocolProviderService
-  implements SipListener
+  implements SipListener,
+             RegistrationStateChangeListener
 {
     private static final Logger logger =
         Logger.getLogger(ProtocolProviderServiceSipImpl.class);
@@ -290,6 +291,9 @@ public void register(SecurityAuthority authority)
         }
 
         sipStackSharing.addSipListener(this);
+        // be warned when we will unregister, so that we can
+        // then remove us as SipListener
+        this.addRegistrationStateChangeListener(this);
 
         // Enable the user name modification. Setting this property to true we'll
         // allow the user to change the user name stored in the given authority.
@@ -2292,4 +2296,21 @@ private InetAddress getIntendedDestination(String host)
 
         return destinationInetAddress;
     }
+
+    /**
+     * Stops dispatching SIP messages to a SIP protocol provider service
+     * once it's been unregistered.
+     *
+     * @param event the change event in the registration state of a provider.
+     */
+    public void registrationStateChanged(RegistrationStateChangeEvent event)
+    {
+        if(event.getNewState() == RegistrationState.UNREGISTERED)
+        {
+            ProtocolProviderServiceSipImpl listener
+                = (ProtocolProviderServiceSipImpl) event.getProvider();
+            this.sipStackSharing.removeSipListener(listener);
+            listener.removeRegistrationStateChangeListener(this);
+        }
+    }
 }

src/net/java/sip/communicator/impl/protocol/sip/SipStackSharing.java

@@ -33,8 +33,7 @@
  * @author Sebastien Mazy
  */
 public class SipStackSharing
-    implements SipListener,
-               RegistrationStateChangeListener
+    implements SipListener
 {
     /**
      * Logger for this class.
@@ -127,7 +126,6 @@ public void addSipListener(ProtocolProviderServiceSipImpl listener)
             if(this.listeners.size() == 0)
                 startListening();
             this.listeners.add(listener);
-            listener.addRegistrationStateChangeListener(this);
             logger.trace(this.listeners.size() + " listeners now");
         }
     }
@@ -139,7 +137,7 @@ public void addSipListener(ProtocolProviderServiceSipImpl listener)
      *
      * @param listener possible target to remove for the dispatching process.
      */
-    private void removeSipListener(ProtocolProviderServiceSipImpl listener)
+    public void removeSipListener(ProtocolProviderServiceSipImpl listener)
     {
         synchronized(this.listeners)
         {
@@ -165,23 +163,6 @@ private Set<ProtocolProviderServiceSipImpl> getSipListeners()
         }
     }
 
-    /**
-     * Stops dispatching SIP messages to a SIP protocol provider service
-     * once it's been unregistered.
-     *
-     * @param event the change event in the registration state of a provider.
-     */
-    public void registrationStateChanged(RegistrationStateChangeEvent event)
-    {
-        if(event.getNewState() == RegistrationState.UNREGISTERED)
-        {
-            ProtocolProviderServiceSipImpl listener
-                = (ProtocolProviderServiceSipImpl) event.getProvider();
-            this.removeSipListener(listener);
-            listener.removeRegistrationStateChangeListener(this);
-        }
-    }
-
     /**
      * Returns the JAIN-SIP <tt>ListeningPoint</tt> associated to the given
      * transport string.