ONOS-1479 - GUI Topology Overlay Work - (WIP)
- Implemented initial ability to have overlay modify the summary panel data.

Change-Id: I0d6bd6d62f0e0d5ba9d901a47271044e0c8d0c89
diff --git a/core/api/src/main/java/org/onosproject/ui/UiTopoOverlay.java b/core/api/src/main/java/org/onosproject/ui/UiTopoOverlay.java
index 999067a..a36d510 100644
--- a/core/api/src/main/java/org/onosproject/ui/UiTopoOverlay.java
+++ b/core/api/src/main/java/org/onosproject/ui/UiTopoOverlay.java
@@ -17,6 +17,7 @@
 
 package org.onosproject.ui;
 
+import org.onosproject.ui.topo.PropertyPanel;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -75,4 +76,13 @@
      */
     public void destroy() {
     }
+
+    /**
+     * Callback to modify the contents of the summary panel.
+     * This default implementation does nothing.
+     *
+     * @param pp property panel model of summary data
+     */
+    public void modifySummary(PropertyPanel pp) {
+    }
 }