/**
 * An abstract implementation of {@link Hasher}, which only requires subtypes to implement {@link
 * #putByte}. Subtypes may provide more efficient implementations, however.
 *
 * @author Dimitris Andreou
 */
@ElementTypesAreNonnullByDefault
abstract class AbstractHasher implements Hasher {
  @Override
  @CanIgnoreReturnValue
  public final Hasher putBoolean(boolean b) {
    return putByte(b ? (byte) 1 : (byte) 0);

// 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.

  private final ByteBuffer scratch = ByteBuffer.allocate(8).order(ByteOrder.LITTLE_ENDIAN);

  /** Updates this hasher with the given byte. */
  protected abstract void update(byte b);

  /** Updates this hasher with the given bytes. */
  protected void update(byte[] b) {
    update(b, 0, b.length);
  }

  /** Updates this hasher with {@code len} bytes starting at {@code off} in the given buffer. */

        transform.applyConfigurationTo(hasher);
        return hasher.hash();
    }

    private static ClasspathFileHasher createFileHasherWithConfig(HashCode configHash, ClasspathFileHasher fileHasher) {
        return sourceSnapshot -> {
            Hasher hasher = Hashing.newHasher();
            hasher.putHash(configHash);
            hasher.putHash(fileHasher.hashOf(sourceSnapshot));

    @Override
    boolean filter(ZipEntryContext context) {
        return !context.getEntry().isDirectory();
    }

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

    @Override
    Optional<HashCode> tryHash(RegularFileSnapshotContext snapshotContext) {
        return Optional.of(snapshotContext)

  private final ByteBuffer scratch = ByteBuffer.allocate(8).order(ByteOrder.LITTLE_ENDIAN);

  /** Updates this hasher with the given byte. */
  protected abstract void update(byte b);

  /** Updates this hasher with the given bytes. */
  protected void update(byte[] b) {
    update(b, 0, b.length);
  }

  /** Updates this hasher with {@code len} bytes starting at {@code off} in the given buffer. */

    @Override
    public void appendToHasher(Hasher hasher) {
        hasher.putString(LambdaImplementationSnapshot.class.getName());
        hasher.putString(classIdentifier);
        hasher.putHash(classLoaderHash);
        hasher.putString(functionalInterfaceClass);
        hasher.putString(implClass);
        hasher.putString(implMethodName);
        hasher.putString(implMethodSignature);
        hasher.putInt(implMethodKind);
    }

        return entries;
    }

    @Override
    public void appendToHasher(Hasher hasher) {
        hasher.putString("Map");
        hasher.putInt(entries.size());
        for (MapEntrySnapshot<T> entry : entries) {
            entry.getKey().appendToHasher(hasher);
            entry.getValue().appendToHasher(hasher);
        }
    }

    @Override
    public boolean equals(Object obj) {

    }

    @Override
    public void appendConfigurationToHasher(Hasher hasher) {
        super.appendConfigurationToHasher(hasher);
        hasher.putString(getClass().getName());
        propertiesFilePatterns.forEach(hasher::putString);
        propertiesFileFilters.values().forEach(resourceEntryFilter -> resourceEntryFilter.appendConfigurationToHasher(hasher));
    }

    @Override

            default:
                throw new IllegalArgumentException();
        }
    }

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

    @Nullable
    @Override
    public HashCode hash(FileSystemLocationSnapshot snapshot) throws IOException {