feat: add factory method to init builder from an extising configuation

Signed-off-by: Chris Laprun <[email protected]>

Author: metacosm

Diff for: operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/ResourceConfiguration.java

@@ -4,6 +4,7 @@
 import java.util.Collections;
 import java.util.Optional;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 import io.fabric8.kubernetes.api.model.HasMetadata;
 import io.fabric8.kubernetes.client.informers.cache.ItemStore;
@@ -103,7 +104,7 @@ static void failIfNotValid(Set<String> namespaces) {
 
   static Set<String> ensureValidNamespaces(Collection<String> namespaces) {
     if (namespaces != null && !namespaces.isEmpty()) {
-      return Set.copyOf(namespaces);
+      return namespaces.stream().map(String::trim).collect(Collectors.toSet());
     } else {
       return Constants.DEFAULT_NAMESPACES_SET;
     }

Diff for: operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/dependent/kubernetes/InformerConfigHolder.java

@@ -66,6 +66,15 @@ public static <R extends HasMetadata> InformerConfigHolder<R>.Builder builder(
     return new InformerConfigHolder().builder;
   }
 
+  @SuppressWarnings({"rawtypes", "unchecked"})
+  public static <R extends HasMetadata> InformerConfigHolder<R>.Builder builder(
+      InformerConfigHolder<R> original) {
+    return new InformerConfigHolder(original.name, original.namespaces,
+        original.followControllerNamespacesOnChange, original.labelSelector, original.onAddFilter,
+        original.onUpdateFilter, original.onDeleteFilter, original.genericFilter,
+        original.itemStore, original.informerListLimit).builder;
+  }
+
   public String getName() {
     return name;
   }