// An IPAddress must reference a parent object.
  // +required
  optional ParentReference parentRef = 1;
}

// ParentReference describes a reference to a parent object.
message ParentReference {
  // Group is the group of the object being referenced.
  // +optional
  optional string group = 1;

  // Resource is the resource of the object being referenced.
  // +required

        this.metadataResolver = Objects.requireNonNull(metadataResolver, "metadataResolver cannot be null");
        this.syncContextFactory = Objects.requireNonNull(syncContextFactory, "syncContextFactory cannot be null");
        this.repositoryEventDispatcher =
                Objects.requireNonNull(repositoryEventDispatcher, "repositoryEventDispatcher cannot be null");

	delErrs := make([]error, len(objects))

	// The result of delete objects
	delObjects := make([]DeletedObject, len(objects))

	// A map between a set and its associated objects
	objSetMap := make(map[int][]delObj)

	// Group objects by set index
	for i, object := range objects {
		index := s.getHashedSetIndex(object.ObjectName)

     */
    static boolean isInScope(Artifact artifact, Artifact nodeArtifact) {
        return Objects.equals(artifact.getGroupId(), nodeArtifact.getGroupId())
                && Objects.equals(artifact.getArtifactId(), nodeArtifact.getArtifactId())
                && Objects.equals(artifact.getVersion(), nodeArtifact.getVersion());
    }

  optional string resource = 1;

  // responseKind describes the group, version, and kind of the serialization schema for the object type this endpoint typically returns.
  // APIs may return other objects types at their discretion, such as error conditions, requests for alternate representations, or other operation specific behavior.

    Ordering<Number> unusedF = numbers.compound(objects).compound(objects); // bad IDEA
    Ordering<Number> unusedG = objects.compound(numbers).compound(objects);
    Ordering<Number> unusedH = objects.compound(objects).compound(numbers);

    Ordering<Number> unusedI = numbers.compound(objects.compound(objects));
    Ordering<Number> unusedJ = objects.compound(numbers.compound(objects)); // bad IDEA

    Ordering<Number> unusedF = numbers.compound(objects).compound(objects); // bad IDEA
    Ordering<Number> unusedG = objects.compound(numbers).compound(objects);
    Ordering<Number> unusedH = objects.compound(objects).compound(numbers);

    Ordering<Number> unusedI = numbers.compound(objects.compound(objects));
    Ordering<Number> unusedJ = objects.compound(numbers.compound(objects)); // bad IDEA

  //   allows any non-core object, as well as PersistentVolumeClaim objects.
  // * While dataSource ignores disallowed values (dropping them), dataSourceRef
  //   preserves all values, and generates an error if a disallowed value is
  //   specified.
  // * While dataSource only allows local objects, dataSourceRef allows objects
  //   in any namespaces.

     */
    final class Key<T> {

        private final Class<T> type;
        private final Object id;

        private Key(Class<T> type, Object id) {
            this.type = type;
            this.id = id;
        }

        public Class<T> type() {
            return type;
        }

        @Override
        public boolean equals(Object o) {

    return ordering.compare(function.apply(left), function.apply(right));
  }

  @Override
  public boolean equals(@CheckForNull Object object) {
    if (object == this) {
      return true;
    }
    if (object instanceof ByFunctionOrdering) {
      ByFunctionOrdering<?, ?> that = (ByFunctionOrdering<?, ?>) object;
      return this.function.equals(that.function) && this.ordering.equals(that.ordering);
    }
    return false;
  }