From acf514530798b148ab9f0781ce3f78c1c09da4c4 Mon Sep 17 00:00:00 2001
From: jsimomaa <jani.simomaa@gmail.com>
Date: Sat, 16 Nov 2019 07:14:48 +0200
Subject: [PATCH] Dynamic visualisations UI - check for NPE's

gitlab #59

Change-Id: I21d1ab3375e5c462bab07a6001a907ee8ae8841b
---
 .../DynamicVisualisationsUI.java              | 33 +++++++++++--------
 1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/org.simantics.district.network.ui/src/org/simantics/district/network/ui/visualisations/DynamicVisualisationsUI.java b/org.simantics.district.network.ui/src/org/simantics/district/network/ui/visualisations/DynamicVisualisationsUI.java
index bb608eaa..055b503a 100644
--- a/org.simantics.district.network.ui/src/org/simantics/district/network/ui/visualisations/DynamicVisualisationsUI.java
+++ b/org.simantics.district.network.ui/src/org/simantics/district/network/ui/visualisations/DynamicVisualisationsUI.java
@@ -162,15 +162,18 @@ public class DynamicVisualisationsUI {
                 String item = templateSelectionCombo.getItem(templateSelectionCombo.getSelectionIndex());
                 for (NamedResource template : visualisations) {
                     if (item.equals(template.getName())) {
-                        Simantics.getSession().asyncRequest(new WriteRequest() {
-                            
-                            @Override
-                            public void perform(WriteGraph graph) throws DatabaseException {
-                                Resource vf = DynamicVisualisations.getVisualisationFolder(graph, parentResource);
-                                DynamicVisualisations.setActiveVisualisation(graph, vf, template.getResource());
-                            }
-                        });
-                        break;
+                        if (parentResource != null) {
+                            Resource res = parentResource;
+                            Simantics.getSession().asyncRequest(new WriteRequest() {
+                                
+                                @Override
+                                public void perform(WriteGraph graph) throws DatabaseException {
+                                    Resource vf = DynamicVisualisations.getVisualisationFolder(graph, res);
+                                    DynamicVisualisations.setActiveVisualisation(graph, vf, template.getResource());
+                                }
+                            });
+                            break;
+                        }
                     }
                 }
             }
@@ -1354,13 +1357,17 @@ public class DynamicVisualisationsUI {
     private void updateListening() {
         if (visualisationsListener != null)
             visualisationsListener.dispose();
-        visualisationsListener = new VisualisationsListener(this);
-        Simantics.getSession().asyncRequest(new DynamicVisualisationsRequest(parentResource), visualisationsListener);
+        if (parentResource != null) {
+            visualisationsListener = new VisualisationsListener(this);
+            Simantics.getSession().asyncRequest(new DynamicVisualisationsRequest(parentResource), visualisationsListener);
+        }
         
         if (listener != null)
             listener.dispose();
-        listener = new VisualisationListener(this);
-        Simantics.getSession().asyncRequest(new ActiveDynamicVisualisationsRequest(parentResource), listener);
+        if (parentResource != null) {
+            listener = new VisualisationListener(this);
+            Simantics.getSession().asyncRequest(new ActiveDynamicVisualisationsRequest(parentResource), listener);
+        }
     }
 
     private static class VisualisationsListener implements Listener<Collection<NamedResource>> {
-- 
2.45.2