feat: add retrieval of RegisteredController by name (#2829)

* feat: add retrieval of RegisteredController by name

Signed-off-by: Chris Laprun <claprun@redhat.com>

Author: metacosm

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/RuntimeInfo.java

@@ -5,6 +5,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import io.fabric8.kubernetes.api.model.HasMetadata;
 import io.javaoperatorsdk.operator.health.EventSourceHealthIndicator;
 import io.javaoperatorsdk.operator.health.InformerWrappingEventSourceHealthIndicator;
 import io.javaoperatorsdk.operator.processing.event.source.controller.ControllerEventSource;
@@ -22,14 +23,15 @@ public class RuntimeInfo {
   private final Operator operator;
 
   public RuntimeInfo(Operator operator) {
-    this.registeredControllers = operator.getRegisteredControllers();
+    this.registeredControllers = Collections.unmodifiableSet(operator.getRegisteredControllers());
     this.operator = operator;
   }
 
   public boolean isStarted() {
     return operator.isStarted();
   }
 
+  @SuppressWarnings("unused")
   public Set<RegisteredController> getRegisteredControllers() {
     checkIfStarted();
     return registeredControllers;
@@ -80,4 +82,23 @@ public Map<String, Map<String, EventSourceHealthIndicator>> unhealthyEventSource
     }
     return res;
   }
+
+  /**
+   * Retrieves the {@link RegisteredController} associated with the specified controller name or
+   * {@code null} if no such controller is registered.
+   *
+   * @param controllerName the name of the {@link RegisteredController} to retrieve
+   * @return the {@link RegisteredController} associated with the specified controller name or
+   *     {@code null} if no such controller is registered
+   * @since 5.1.2
+   */
+  @SuppressWarnings({"unchecked", "unused"})
+  public RegisteredController<? extends HasMetadata> getRegisteredController(
+      String controllerName) {
+    checkIfStarted();
+    return registeredControllers.stream()
+        .filter(rc -> rc.getConfiguration().getName().equals(controllerName))
+        .findFirst()
+        .orElse(null);
+  }
 }