public FallbackHandlingResourceHasher(ResourceHasher delegate) {
        this.delegate = delegate;
    }

    @Override
    public void appendConfigurationToHasher(Hasher hasher) {
        delegate.appendConfigurationToHasher(hasher);
        hasher.putString(this.getClass().getName());
    }

    @Nullable
    @Override
    public HashCode hash(RegularFileSnapshotContext snapshotContext) throws IOException {

/**
 * Output stream decorator that hashes data written to the stream.
 * Inspired by the Google Guava project.
 */
public final class HashingOutputStream extends FilterOutputStream {
    private final PrimitiveHasher hasher;

    public HashingOutputStream(HashFunction hashFunction, OutputStream out) {
        super(checkNotNull(out));
        this.hasher = checkNotNull(hashFunction.newPrimitiveHasher());
    }

Michael Anthony Knyszek <******@****.***> 1717451199 +0000

Harshavardhana <******@****.***> 1653656419 -0700

        return zipEntryContext.getEntry().withInputStream(Hashing::hashStream);
    }

    @Override
    public void appendConfigurationToHasher(Hasher hasher) {
        hasher.putString(getClass().getName());
    }

 *
 * @author Qian Huang
 * @since 16.0
 */
@Beta
@ElementTypesAreNonnullByDefault
public final class HashingInputStream extends FilterInputStream {
  private final Hasher hasher;

  /**
   * Creates an input stream that hashes using the given {@link HashFunction} and delegates all data
   * read from it to the underlying {@link InputStream}.
   *

 *
 * @author Qian Huang
 * @since 16.0
 */
@Beta
@ElementTypesAreNonnullByDefault
public final class HashingInputStream extends FilterInputStream {
  private final Hasher hasher;

  /**
   * Creates an input stream that hashes using the given {@link HashFunction} and delegates all data
   * read from it to the underlying {@link InputStream}.
   *

// Map.Lookup require updates to the hasher, so a full Mutex lock (not a
// read-lock) is require around all Map operations if a shared
// hasher is accessed from multiple threads.
//
// If SetHasher is not called, the Map will create a private hasher at
// the first call to Insert.
func (m *Map) SetHasher(hasher Hasher) {
	m.hasher = hasher
}

// Delete removes the entry with the given key, if any.

 *
 * @author Nick Piepmeier
 * @since 16.0
 */
@Beta
@ElementTypesAreNonnullByDefault
public final class HashingOutputStream extends FilterOutputStream {
  private final Hasher hasher;

  /**
   * Creates an output stream that hashes using the given {@link HashFunction}, and forwards all
   * data written to it to the underlying {@link OutputStream}.
   *

            }
            Hasher hasher = Hashing.newHasher();
            hasher.putHash(DIR_SIGNATURE);
            for (FileSystemLocationSnapshot child : children) {
                hasher.putString(child.getName());
                hasher.putHash(child.getHash());
            }
            return new DirectorySnapshot(absolutePath, name, accessType, hasher.hash(), children);
        }
    }