--- a/flys-client/ChangeLog	Fri Feb 18 15:40:04 2011 +0000
+++ b/flys-client/ChangeLog	Fri Feb 18 15:42:29 2011 +0000
@@ -1,3 +1,11 @@
+2011-02-18  Ingo Weinzierl <ingo@intevation.de>
+
+	* src/main/java/de/intevation/flys/client/client/event/CollectionChangeHandler.java,
+	  src/main/java/de/intevation/flys/client/client/event/CollectionChangeEvent.java,
+	  src/main/java/de/intevation/flys/client/client/event/HasCollectionChangeHandlers.java:
+	  New. These interfaces and classes should be used to listen to changes in
+	  Collections.
+
 2011-02-18  Ingo Weinzierl <ingo@intevation.de>
 
 	* src/main/java/de/intevation/flys/client/shared/model/DefaultCollection.java,

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/client/event/CollectionChangeEvent.java	Fri Feb 18 15:42:29 2011 +0000
@@ -0,0 +1,29 @@
+package de.intevation.flys.client.client.event;
+
+import de.intevation.flys.client.shared.model.Collection;
+
+
+/**
+ * This events stores references to the old collection and the new one.
+ *
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public class CollectionChangeEvent {
+
+    protected Collection oldCollection;
+    protected Collection newCollection;
+
+    public CollectionChangeEvent(Collection old, Collection newArt) {
+        oldCollection = old;
+        newCollection = newArt;
+    }
+
+    public Collection getOldValue() {
+        return oldCollection;
+    }
+
+    public Collection getNewValue() {
+        return newCollection;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/client/event/CollectionChangeHandler.java	Fri Feb 18 15:42:29 2011 +0000
@@ -0,0 +1,18 @@
+package de.intevation.flys.client.client.event;
+
+
+/**
+ * Handler interface for CollectionChangeEvent events.
+ *
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public interface CollectionChangeHandler {
+
+    /**
+     * Called when a CollectionChangeEvent is fired.
+     *
+     * @param event The CollectionChangeEvent.
+     */
+    public void onCollectionChange(CollectionChangeEvent event);
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/client/event/HasCollectionChangeHandlers.java	Fri Feb 18 15:42:29 2011 +0000
@@ -0,0 +1,16 @@
+package de.intevation.flys.client.client.event;
+
+
+/**
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public interface HasCollectionChangeHandlers {
+
+    /**
+     * Adds a new CollectionChangeHandler.
+     *
+     * @param handler The new CollectionChangeHandler.
+     */
+    public void addCollectionChangeHandler(CollectionChangeHandler handler);
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :