--- a/flys-client/ChangeLog	Thu Mar 10 13:42:15 2011 +0000
+++ b/flys-client/ChangeLog	Thu Mar 10 13:49:48 2011 +0000
@@ -1,3 +1,9 @@
+2011-03-10  Ingo Weinzierl <ingo@intevation.de>
+
+	* src/main/java/de/intevation/flys/client/client/ui/CollectionView.java:
+	  Integrated the mechnism to listen on paramer changes. The CollectionView
+	  is both: a HasParameterChangeHandler and a ParameterChangeHandler.
+
 2011-03-10  Ingo Weinzierl <ingo@intevation.de>
 
 	* src/main/java/de/intevation/flys/client/client/ui/SelectProvider.java:

--- a/flys-client/src/main/java/de/intevation/flys/client/client/ui/CollectionView.java	Thu Mar 10 13:42:15 2011 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/client/ui/CollectionView.java	Thu Mar 10 13:49:48 2011 +0000
@@ -27,11 +27,14 @@
 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.HasParameterChangeHandler;
 import de.intevation.flys.client.client.event.HasStepForwardHandlers;
 import de.intevation.flys.client.client.event.CollectionChangeEvent;
+import de.intevation.flys.client.client.event.CollectionChangeHandler;
+import de.intevation.flys.client.client.event.ParameterChangeEvent;
+import de.intevation.flys.client.client.event.ParameterChangeHandler;
 import de.intevation.flys.client.client.event.StepForwardEvent;
 import de.intevation.flys.client.client.event.StepForwardHandler;
-import de.intevation.flys.client.client.event.CollectionChangeHandler;
 import de.intevation.flys.client.client.services.ArtifactService;
 import de.intevation.flys.client.client.services.ArtifactServiceAsync;
 import de.intevation.flys.client.client.services.StepForwardService;
@@ -47,6 +50,7 @@
 public class CollectionView
 extends      Window
 implements   CollectionChangeHandler, HasCollectionChangeHandlers,
+             HasParameterChangeHandler, ParameterChangeHandler,
              StepForwardHandler
 {
     /** The ArtifactService used to communicate with the Artifact server. */
@@ -73,6 +77,9 @@
     /** The list of ValueChangeHandlers.*/
     protected List<CollectionChangeHandler> handlers;
 
+    /** The list of ParameterizationChangeHandler.*/
+    protected List<ParameterChangeHandler> parameterHandlers;
+
     /** The collection to be displayed.*/
     protected Collection collection;
 
@@ -101,13 +108,15 @@
         this.flys       = flys;
         this.collection = collection;
 
-        this.tabs          = new TabSet();
-        this.parameterTab  = new Tab(messages.winfo());
-        this.parameterList = new ParameterList();
-        this.handlers      = new ArrayList<CollectionChangeHandler>();
-        this.layout        = new VLayout();
+        this.tabs              = new TabSet();
+        this.parameterTab      = new Tab(messages.winfo());
+        this.parameterList     = new ParameterList();
+        this.handlers          = new ArrayList<CollectionChangeHandler>();
+        this.parameterHandlers = new ArrayList<ParameterChangeHandler>();
+        this.layout            = new VLayout();
 
         addCollectionChangeHandler(this);
+        addParameterChangeHandler(this);
 
         init();
     }
@@ -185,6 +194,18 @@
 
 
     /**
+     * This method registers a new ParameterChangeHandler.
+     *
+     * @param handler The new ParameterChangeHandler.
+     */
+    public void addParameterChangeHandler(ParameterChangeHandler handler) {
+        if (handler != null) {
+            parameterHandlers.add(handler);
+        }
+    }
+
+
+    /**
      * This method calls the <code>onValueChange()</code> method of all
      * registered ValueChangeHanders.
      */
@@ -198,6 +219,17 @@
 
 
     /**
+     * This method calls the <code>onParameterChange()</code> method of all
+     * registered ParameterChangeHandler.
+     */
+    protected void fireParameterChangeEvent(Artifact old, Artifact newArt) {
+        for (ParameterChangeHandler handler: parameterHandlers) {
+            handler.onParameterChange(new ParameterChangeEvent(old, newArt));
+        }
+    }
+
+
+    /**
      * This method returns true, if the Collection is new and no plugins has
      * been chosen.
      *
@@ -252,7 +284,6 @@
 
                         public void onSuccess(Artifact artifact) {
                             GWT.log("Successfully created a new artifact.");
-                            setArtifact(artifact);
 
                             forwardService.go(serverUrl, artifact, feedData,
                             new AsyncCallback<Artifact>() {
@@ -281,7 +312,23 @@
      * @param artifact The new artifact.
      */
     protected void setArtifact(Artifact artifact) {
+        Artifact tmp  = this.artifact;
         this.artifact = artifact;
+
+        fireParameterChangeEvent(tmp, this.artifact);
+    }
+
+
+    /**
+     * Implements the onCollectionChange() method to do update the GUI after the
+     * parameterization has changed.
+     *
+     * @param event The ParameterChangeEvent.
+     */
+    public void onParameterChange(ParameterChangeEvent event) {
+
+        // TODO IMPLEMENT ME
+        updateView();
     }
 
 
@@ -303,6 +350,12 @@
     }
 
 
+    /**
+     * This method is called if the user clicks on the 'next' button to advance
+     * to the next state.
+     *
+     * @param event The StepForwardEvent.
+     */
     public void onStepForward(StepForwardEvent event) {
         GWT.log("CollectionView - onStepForward()");
         GWT.log("TODO: IMPLEMENT FEED!");
@@ -313,8 +366,7 @@
      * Update the view (refresh the list of old and current data).
      */
     protected void updateView() {
-        GWT.log("Update view of the collection: " + collection.identifier());
-        Artifact artifact        = collection.getArtifact(0);
+        GWT.log("CollectionView.updateView()");
         ArtifactDescription desc = artifact.getArtifactDescription();
 
         Data currentData = desc.getCurrentData();