--- a/flys-client/ChangeLog	Fri Feb 18 15:42:29 2011 +0000
+++ b/flys-client/ChangeLog	Mon Feb 21 07:03:13 2011 +0000
@@ -1,3 +1,10 @@
+2011-02-21  Ingo Weinzierl <ingo@intevation.de>
+
+	* src/main/java/de/intevation/flys/client/client/ui/CollectionView.java:
+	  This view implements the HasCollectionChangeHandlers interface -
+	  CollectionChangeHandler can register to this class and retrieve
+	  notifications when the collection of this view changes.
+
 2011-02-18  Ingo Weinzierl <ingo@intevation.de>
 
 	* src/main/java/de/intevation/flys/client/client/event/CollectionChangeHandler.java,

--- a/flys-client/src/main/java/de/intevation/flys/client/client/ui/CollectionView.java	Fri Feb 18 15:42:29 2011 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/client/ui/CollectionView.java	Mon Feb 21 07:03:13 2011 +0000
@@ -1,5 +1,8 @@
 package de.intevation.flys.client.client.ui;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import com.google.gwt.core.client.GWT;
 import com.google.gwt.i18n.client.DateTimeFormat;
 import com.google.gwt.user.client.rpc.AsyncCallback;
@@ -16,10 +19,14 @@
 
 import de.intevation.flys.client.shared.model.Artifact;
 import de.intevation.flys.client.shared.model.Collection;
+import de.intevation.flys.client.shared.model.DefaultCollection;
 
 import de.intevation.flys.client.client.Config;
 import de.intevation.flys.client.client.FLYS;
 import de.intevation.flys.client.client.FLYSMessages;
+import de.intevation.flys.client.client.event.HasCollectionChangeHandlers;
+import de.intevation.flys.client.client.event.CollectionChangeEvent;
+import de.intevation.flys.client.client.event.CollectionChangeHandler;
 import de.intevation.flys.client.client.services.ArtifactService;
 import de.intevation.flys.client.client.services.ArtifactServiceAsync;
 
@@ -27,7 +34,9 @@
 /**
  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
  */
-public class CollectionView extends Window {
+public class CollectionView
+extends      Window
+implements   CollectionChangeHandler, HasCollectionChangeHandlers {
 
     /** The ArtifactService used to communicate with the Artifact server. */
     protected ArtifactServiceAsync artifactService =
@@ -39,13 +48,12 @@
     /** The FLYS instance used to call services.*/
     protected FLYS flys;
 
+    /** The list of ValueChangeHandlers.*/
+    protected List<CollectionChangeHandler> handlers;
+
     /** The collection to be displayed.*/
     protected Collection collection;
 
-    /** TODO The artifact needs to be removed here after the Collection stuff in
-     * the server has been finished! */
-    protected Artifact artifact;
-
     /** The parameter tab.*/
     protected Tab parameterTab;
 
@@ -63,6 +71,10 @@
         this.flys       = flys;
         this.collection = collection;
 
+        this.handlers = new ArrayList<CollectionChangeHandler>();
+
+        addCollectionChangeHandler(this);
+
         init();
     }
 
@@ -90,13 +102,38 @@
 
 
     /**
+     * This method registers a new ValueChangeHandler.
+     *
+     * @param handler The new ValueChangeHandler.
+     */
+    public void addCollectionChangeHandler(CollectionChangeHandler handler) {
+        if (handler != null) {
+            handlers.add(handler);
+        }
+    }
+
+
+    /**
+     * This method calls the <code>onValueChange()</code> method of all
+     * registered ValueChangeHanders.
+     */
+    protected void fireCollectionChangeEvent(
+        Collection old, Collection newCol)
+    {
+        for (CollectionChangeHandler handler: handlers) {
+            handler.onCollectionChange(new CollectionChangeEvent(old, newCol));
+        }
+    }
+
+
+    /**
      * This method returns true, if the Collection is new and no plugins has
      * been chosen.
      *
      * @return true, if the Collection is new.
      */
     public boolean isNew() {
-        return true;
+        return collection.getArtifactLength() == 0 ? true : false;
     }
 
 
@@ -137,7 +174,10 @@
 
                         public void onSuccess(Artifact artifact) {
                             GWT.log("Successfully created a new artifact.");
-                            setArtifact(artifact);
+                            Collection c = new DefaultCollection("TODO");
+                            c.addArtifact(artifact);
+
+                            setCollection(c);
                         }
                 });
             }
@@ -151,19 +191,25 @@
 
 
     /**
-     * Set the current artifact.
+     * Set the current collection.
      *
-     * @param artifact The new artifact.
+     * @param collection The new collection.
      */
-    protected void setArtifact(Artifact artifact) {
-        this.artifact = artifact;
+    protected void setCollection(Collection collection) {
+        Collection tmp  = this.collection;
+        this.collection = collection;
 
+        fireCollectionChangeEvent(tmp, this.collection);
+    }
+
+
+    public void onCollectionChange(CollectionChangeEvent event) {
         updateView();
     }
 
 
     protected void updateView() {
-        GWT.log("Update the view of the artifact: " + artifact.getUuid());
+        GWT.log("Update view of the collection: " + collection.identifier());
         // TODO display the artifact information / data
     }
 }