[205668] Provide buddies example

https://bugs.eclipse.org/bugs/show_bug.cgi?id=205668

2 files changed, 38 insertions, 4 deletions

diff --git a/plugins/org.eclipse.net4j.buddies.ui/src/org/eclipse/net4j/buddies/internal/ui/views/BuddiesView.java b/plugins/org.eclipse.net4j.buddies.ui/src/org/eclipse/net4j/buddies/internal/ui/views/BuddiesView.java
index 48d81a8eea..744c1ee08d 100644
--- a/plugins/org.eclipse.net4j.buddies.ui/src/org/eclipse/net4j/buddies/internal/ui/views/BuddiesView.java
+++ b/plugins/org.eclipse.net4j.buddies.ui/src/org/eclipse/net4j/buddies/internal/ui/views/BuddiesView.java
@@ -66,7 +66,7 @@ public class BuddiesView extends ContainerView implements IListener
   {
     if (event instanceof IBuddiesManagerStateChangedEvent)
     {
-      session = IBuddiesManager.INSTANCE.getSession();
+      queryBuddiesManager();
       updateState();
     }
     else if (event instanceof IBuddyStateChangedEvent)
@@ -82,7 +82,7 @@ public class BuddiesView extends ContainerView implements IListener
   protected Control createUI(Composite parent)
   {
     Control control = super.createUI(parent);
-    session = IBuddiesManager.INSTANCE.getSession();
+    queryBuddiesManager();
     IBuddiesManager.INSTANCE.addListener(this);
     INSTANCE = this;
     updateState();
@@ -132,6 +132,23 @@ public class BuddiesView extends ContainerView implements IListener
     super.fillLocalPullDown(manager);
   }
 
+  protected void queryBuddiesManager()
+  {
+    IBuddySession oldSession = session;
+    session = IBuddiesManager.INSTANCE.getSession();
+    if (oldSession != null && oldSession != session)
+    {
+      oldSession.removeListener(this);
+      oldSession.getSelf().removeListener(this);
+    }
+
+    if (session != null && session != oldSession)
+    {
+      session.addListener(this);
+      session.getSelf().addListener(this);
+    }
+  }
+
   protected void updateState()
   {
     updateState(availableAction, IBuddy.State.AVAILABLE);
diff --git a/plugins/org.eclipse.net4j.buddies.ui/src/org/eclipse/net4j/buddies/internal/ui/views/CollaborationsView.java b/plugins/org.eclipse.net4j.buddies.ui/src/org/eclipse/net4j/buddies/internal/ui/views/CollaborationsView.java
index 4cd76ab5a9..520713fbe6 100644
--- a/plugins/org.eclipse.net4j.buddies.ui/src/org/eclipse/net4j/buddies/internal/ui/views/CollaborationsView.java
+++ b/plugins/org.eclipse.net4j.buddies.ui/src/org/eclipse/net4j/buddies/internal/ui/views/CollaborationsView.java
@@ -63,7 +63,7 @@ public class CollaborationsView extends ContainerView implements IListener
   {
     if (event instanceof IBuddiesManagerStateChangedEvent)
     {
-      session = IBuddiesManager.INSTANCE.getSession();
+      queryBuddiesManager();
       updateState();
     }
     else if (event instanceof IBuddyStateChangedEvent)
@@ -121,7 +121,7 @@ public class CollaborationsView extends ContainerView implements IListener
     rightControlData.bottom = new FormAttachment(100, 0);
     rightControl.setLayoutData(rightControlData);
 
-    session = IBuddiesManager.INSTANCE.getSession();
+    queryBuddiesManager();
     IBuddiesManager.INSTANCE.addListener(this);
     INSTANCE = this;
     updateState();
@@ -152,6 +152,23 @@ public class CollaborationsView extends ContainerView implements IListener
     super.fillLocalPullDown(manager);
   }
 
+  protected void queryBuddiesManager()
+  {
+    IBuddySession oldSession = session;
+    session = IBuddiesManager.INSTANCE.getSession();
+    if (oldSession != null && oldSession != session)
+    {
+      oldSession.removeListener(this);
+      oldSession.getSelf().removeListener(this);
+    }
+
+    if (session != null && session != oldSession)
+    {
+      session.addListener(this);
+      session.getSelf().addListener(this);
+    }
+  }
+
   protected void updateState()
   {
   }