refactor: simplify (#795)

Author: metacosm

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/reconciler/DefaultContext.java

@@ -4,7 +4,6 @@
 
 import io.fabric8.kubernetes.api.model.HasMetadata;
 import io.javaoperatorsdk.operator.processing.Controller;
-import io.javaoperatorsdk.operator.processing.event.source.ResourceEventSource;
 
 public class DefaultContext<P extends HasMetadata> implements Context {
 
@@ -25,9 +24,8 @@ public Optional<RetryInfo> getRetryInfo() {
 
   @Override
   public <T> Optional<T> getSecondaryResource(Class<T> expectedType, String eventSourceName) {
-    final Optional<ResourceEventSource<P, T>> eventSource =
-        controller.getEventSourceManager().getResourceEventSourceFor(expectedType, eventSourceName);
-    return eventSource.isEmpty() ? Optional.empty()
-        : eventSource.get().getAssociated(primaryResource);
+    return controller.getEventSourceManager()
+        .getResourceEventSourceFor(expectedType, eventSourceName)
+        .flatMap(es -> es.getAssociated(primaryResource));
   }
 }