}

// CreateMultipartMetadata adds the multipart flag entry to metadata
// and returns modified metadata. It allocates a new metadata map if
// metadata is nil.
func CreateMultipartMetadata(metadata map[string]string) map[string]string {
	if metadata == nil {
		return map[string]string{MetaMultipart: ""}
	}
	metadata[MetaMultipart] = ""
	return metadata
}

    private static class CacheEntry<T> {

        long expiration;
        Map<String, T> map;

        CacheEntry(final long ttl) {
            this.expiration = System.currentTimeMillis() + ttl * 1000L;
            this.map = new ConcurrentHashMap<>();
        }
    }

    private static class NegativeCacheEntry<T> extends CacheEntry<T> {

        /**

        "\\W+public static final Version V_(\\d+)_(\\d+)_(\\d+)(_alpha\\d+|_beta\\d+|_rc\\d+)? .*"
    );

    private final Version currentVersion;
    private final Map<Integer, List<Version>> groupByMajor;
    private final Map<Version, UnreleasedVersionInfo> unreleased;

    public class UnreleasedVersionInfo {
        public final Version version;
        public final String branch;

	}
}

var prefixUsageCache = cachevalue.New[map[string]uint64]()

// loadPrefixUsageFromBackend returns prefix usages found in passed buckets
//
//	e.g.:  /testbucket/prefix => 355601334
func loadPrefixUsageFromBackend(ctx context.Context, objAPI ObjectLayer, bucket string) (map[string]uint64, error) {
	z, ok := objAPI.(*erasureServerPools)
	if !ok {
		// Prefix usage is empty
		return map[string]uint64{}, nil
	}

    //                                                                   Map Communication
    //                                                                   =================
    @Override
    public void acceptPrimaryKeyMap(Entity entity, Map<String, ? extends Object> primaryKeyMap) {
    }

    @Override
    public void acceptAllColumnMap(Entity entity, Map<String, ? extends Object> allColumnMap) {
    }

    @Override

    //                                                                   Map Communication
    //                                                                   =================
    @Override
    public void acceptPrimaryKeyMap(Entity entity, Map<String, ? extends Object> primaryKeyMap) {
    }

    @Override
    public void acceptAllColumnMap(Entity entity, Map<String, ? extends Object> allColumnMap) {
    }

    @Override

    }

    @Override
    public Map<R, V> column(C columnKey) {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.column(columnKey);
    }

    @Override
    public Set<C> columnKeySet() {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.columnKeySet();
    }

    @Override
    public Map<C, Map<R, V>> columnMap() {
      assertTrue(Thread.holdsLock(mutex));

    }

    /**
     * Constructs an instance with the same mappings as the specified {@link Map}.
     *
     * @param map
     *            the map whose mappings are to be placed in this map
     */
    public ArrayMap(final Map<? extends K, ? extends V> map) {
        this((int) (map.size() / LOAD_FACTOR) + 1);
        putAll(map);
    }

    @Override
    public int size() {
        return size;
    }

    }

    @Override
    protected Map<String, Object> createTestParam(int id) {
        final Map<String, Object> requestBody = new HashMap<>();
        final String keyProp = NAME_PREFIX + id;
        requestBody.put(KEY_PROPERTY, keyProp);
        return requestBody;
    }

    private static final String NEW_SUFFIX = "_new";

    @Override
    protected Map<String, Object> getUpdateMap() {

    extends AbstractMapBasedMultimap<K, V> implements ListMultimap<K, V> {
  /**
   * Creates a new multimap that uses the provided map.
   *
   * @param map place to store the mapping from each key to its corresponding values
   */
  protected AbstractListMultimap(Map<K, Collection<V>> map) {
    super(map);
  }

  @Override
  abstract List<V> createCollection();