Fixing some NPE's in FPP-Node (e.g. when Asset is outside of the root path)

This closes jme-core PR #421

Author: MeFisto94

jme3-core/src/com/jme3/gde/core/filters/FilterPostProcessorNode.java

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2009-2010 jMonkeyEngine
+ *  Copyright (c) 2009-2016 jMonkeyEngine
  *  All rights reserved.
  * 
  *  Redistribution and use in source and binary forms, with or without
@@ -45,6 +45,8 @@
 import java.util.List;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import javax.swing.Action;
 import org.openide.nodes.AbstractNode;
 import org.openide.nodes.Children;
@@ -63,8 +65,9 @@
 public class FilterPostProcessorNode extends AbstractNode {
 
     private FilterDataObject dataObject;
-    private static Image smallImage = IconList.eyeOpen.getImage();
+    private final static Image smallImage = IconList.eyeOpen.getImage();
     private FilterPostProcessor fpp;
+    private static final Logger logger = Logger.getLogger(FilterPostProcessorNode.class.getName());
 
     public FilterPostProcessorNode(FilterDataObject dataObject) {
         super(new FilterChildren(dataObject), Lookups.singleton(new FilterIndexSupport()));
@@ -74,7 +77,6 @@ public FilterPostProcessorNode(FilterDataObject dataObject) {
         setName(dataObject.getName());
         getLookup().lookup(FilterIndexSupport.class).setFilterPostProcessorNode(this);
         ((FilterChildren) getChildren()).setFilterPostProcessorNode(this);
-
     }
 
     @Override
@@ -89,7 +91,9 @@ public Image getOpenedIcon(int type) {
 
     public FilterPostProcessor getFilterPostProcessor() {
         if (fpp == null) {
-            this.fpp = dataObject.loadAsset();
+            fpp = dataObject.loadAsset();
+            if (fpp == null)
+                logger.log(Level.SEVERE, "Cannot load Filter. Maybe it's not in the Asset Path?");
         }
         return fpp;
     }
@@ -130,7 +134,9 @@ public void addFilter(final Filter filter) {
         SceneApplication.getApplication().enqueue(new Callable<Object>() {
 
             public Object call() throws Exception {
-                getFilterPostProcessor().addFilter(filter);
+                FilterPostProcessor fp = getFilterPostProcessor();
+                if (fp != null)
+                    fp.addFilter(filter);
                 return null;
             }
         });
@@ -142,7 +148,10 @@ public void removeFilter(final Filter filter) {
         SceneApplication.getApplication().enqueue(new Callable<Object>() {
 
             public Object call() throws Exception {
-                getFilterPostProcessor().removeFilter(filter);
+                FilterPostProcessor fp = getFilterPostProcessor();
+                if (fp != null)
+                    fp.removeFilter(filter);
+                
                 return null;
             }
         });
@@ -163,8 +172,8 @@ public void run() {
     public Action[] getActions(boolean context) {
 //        return super.getActions(context);
         return new Action[]{
-            new NewFilterPopup(this)
-        };
+                    new NewFilterPopup(this)
+                };
     }
 
     public static class FilterChildren extends Children.Keys<Object> {
@@ -184,7 +193,9 @@ public void setFilterPostProcessorNode(FilterPostProcessorNode node) {
         @Override
         protected void addNotify() {
             super.addNotify();
-            setKeys(createKeys());
+            List<Object> keys = createKeys();
+            if (keys != null)
+                setKeys(keys);
         }
 
         protected void doRefresh() {
@@ -201,7 +212,11 @@ protected List<Object> createKeys() {
 
                     public List<Object> call() throws Exception {
                         List<Object> keys = new LinkedList<Object>();
-                        for (Iterator it = node.getFilterPostProcessor().getFilterIterator(); it.hasNext();) {
+                        FilterPostProcessor fp = node.getFilterPostProcessor();
+                        if (fp == null) /* e.g. Filter not in Asset Path */
+                            return null;
+                        
+                        for (Iterator it = fp.getFilterIterator(); it.hasNext();) {
                             Filter filter = (Filter) it.next();
                             keys.add(filter);
                         }
@@ -219,10 +234,15 @@ public List<Object> call() throws Exception {
         @Override
         protected Node[] createNodes(Object t) {
             Filter filter = (Filter) t;
-            //get JmeFilter, the only FilterNode spi
-            FilterNode di = Lookup.getDefault().lookup(FilterNode.class); 
-            Node[] ret = di.createNodes(filter, dataObject, readOnly);
-            return ret;
+            for (FilterNode di : Lookup.getDefault().lookupAll(FilterNode.class)) {
+                if (di.getExplorerObjectClass().getName().equals(filter.getClass().getName())) {
+                    Node[] ret = di.createNodes(filter, dataObject, readOnly);
+                    if (ret != null) {
+                        return ret;
+                    }
+                }
+            }
+            return new Node[]{};
         }
     }
 }