fix: potential NPE

Signed-off-by: Chris Laprun <metacosm@gmail.com>

Author: metacosm

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/source/controller/ResourceEvent.java

@@ -25,8 +25,8 @@
 
 public class ResourceEvent extends Event {
 
-  protected final ResourceAction action;
-  protected final HasMetadata resource;
+  private final ResourceAction action;
+  private final HasMetadata resource;
 
   public ResourceEvent(ResourceAction action, ResourceID resourceID, HasMetadata resource) {
     super(resourceID);

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/source/informer/ExtendedResourceEvent.java

@@ -44,12 +44,10 @@ public Optional<HasMetadata> getPreviousResource() {
   @Override
   public String toString() {
     return "ExtendedResourceEvent{"
-        + "previousResourceVersion="
-        + previousResource.getMetadata().getResourceVersion()
+        + getPreviousResource().map(r -> "previousResourceVersion=" + r.getMetadata().getResourceVersion()).orElse("")
         + ", action="
-        + action
-        + ", resourceVersion="
-        + resource.getMetadata().getResourceVersion()
+        + getAction()
+        + getResource().map(r -> ", resourceVersion=" + r.getMetadata().getResourceVersion()).orElse("")
         + ", relatedCustomResourceName="
         + relatedCustomResource.getName()
         + '}';