abstract static class FlatMapSpliterator<
          InElementT extends @Nullable Object,
          OutElementT extends @Nullable Object,
          OutSpliteratorT extends Spliterator<OutElementT>>
      implements Spliterator<OutElementT> {
    /** Factory for constructing {@link FlatMapSpliterator} instances. */
    interface Factory<InElementT extends @Nullable Object, OutSpliteratorT extends Spliterator<?>> {

   *
   * <p>The serialized output consists of the number of entries, first key, first value, second key,
   * second value, and so on.
   */
  static <K extends @Nullable Object, V extends @Nullable Object> void writeMap(
      Map<K, V> map, ObjectOutputStream stream) throws IOException {
    stream.writeInt(map.size());
    for (Map.Entry<K, V> entry : map.entrySet()) {
      stream.writeObject(entry.getKey());

      standardClear();
    }

    @Override
    public boolean contains(Object object) {
      return standardContains(object);
    }

    @Override
    public boolean containsAll(Collection<?> collection) {
      return standardContainsAll(collection);
    }

    @Override
    public boolean remove(Object object) {
      return standardRemove(object);
    }

    @Override

            @Override
            void doInterpolate(Object target, InterpolateObjectAction ctx) throws IllegalAccessException {
                @SuppressWarnings("unchecked")
                Map<Object, Object> m = (Map<Object, Object>) field.get(target);
                if (m == null || m.isEmpty()) {
                    return;
                }

                for (Map.Entry<Object, Object> entry : m.entrySet()) {

    }

    private static class TestIngester extends Ingester {
        int processCalled = 0;

        @Override
        public Map<String, Object> process(Map<String, Object> target, DataStoreParams paramMap) {
            processCalled++;
            Map<String, Object> result = new HashMap<>(target);
            result.put("status", "processed");
            return result;
        }
    }

        .addEqualityGroup(
            entry,
            Tables.<@Nullable Object, @Nullable Object, @Nullable Object>immutableCell(
                null, null, null))
        .addEqualityGroup(
            Tables.<String, @Nullable Object, @Nullable Object>immutableCell("bar", null, null))
        .addEqualityGroup(
            Tables.<@Nullable Object, Integer, @Nullable Object>immutableCell(null, 2, null))
        .addEqualityGroup(

				"x-amz-object-lock-legal-hold":        "on",
				"x-amz-object-lock-mode":              "governance",
				"x-amz-object-lock-retain-until-date": "2020-02-01",
			},
			expected:        map[string]string{},
			filterRetention: true,
			filterLegalHold: true,
		},
		{
			metadata: map[string]string{
				"x-amz-object-lock-legal-hold":        "on",
				"x-amz-object-lock-mode":              "governance",

			wants:    objInfos[:3],
			wantExpired: []ObjectToDelete{
				{ObjectV: ObjectV{ObjectName: obj, VersionID: objInfos[3].VersionID}},
				{ObjectV: ObjectV{ObjectName: obj, VersionID: objInfos[4].VersionID}},
			},
		},
		{
			objInfos:    allVersExpObjInfos,
			wants:       nil,
			wantExpired: []ObjectToDelete{{ObjectV: ObjectV{ObjectName: obj, VersionID: allVersExpObjInfos[0].VersionID}}},
		},
		{

        }
        return (T) arg;
    }

    private Object convertPrimitiveWrapper(final Object arg) {
        return NumberConversionUtil.convertPrimitiveWrapper(propertyType, arg);
    }

    private Object convertNumber(final Object arg) {
        return NumberConversionUtil.convertNumber(propertyType, arg);
    }

    private Object convertDate(final Object arg) {
        if (propertyType == java.util.Date.class) {

		}

		return nil
	}

	prefix = retainSlash(prefix)

	for object := range clnt.ListObjects(cctx, bucket, minio.ListObjectsOptions{
		Prefix:    prefix,
		Recursive: false,
	}) {
		if object.Err != nil {
			return object.Err
		}

		if object.Key == prefix {
			continue
		}

		isDir := strings.HasSuffix(object.Key, SlashSeparator)
		info := minioFileInfo{