import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Skeleton implementation of {@link HashFunction} in terms of {@link #newHasher()}.
 *
 * <p>TODO(lowasser): make public
 */
@Immutable
@ElementTypesAreNonnullByDefault
abstract class AbstractHashFunction implements HashFunction {
  @Override
  public <T extends @Nullable Object> HashCode hashObject(

  // From http://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#Mac
  private static final ImmutableTable<String, SecretKey, HashFunction> ALGORITHMS =
      new ImmutableTable.Builder<String, SecretKey, HashFunction>()
          .put("HmacMD5", MD5_KEY, Hashing.hmacMd5(MD5_KEY))
          .put("HmacSHA1", SHA1_KEY, Hashing.hmacSha1(SHA1_KEY))

@ElementTypesAreNonnullByDefault
abstract class AbstractCompositeHashFunction extends AbstractHashFunction {

  @SuppressWarnings("Immutable") // array not modified after creation
  final HashFunction[] functions;

  AbstractCompositeHashFunction(HashFunction... functions) {
    for (HashFunction function : functions) {
      checkNotNull(function);
    }
    this.functions = functions;
  }

  /**

 * @author Dimitris Andreou
 */
@Immutable
@ElementTypesAreNonnullByDefault
final class Murmur3_128HashFunction extends AbstractHashFunction implements Serializable {
  static final HashFunction MURMUR3_128 = new Murmur3_128HashFunction(0);

  static final HashFunction GOOD_FAST_HASH_128 =
      new Murmur3_128HashFunction(Hashing.GOOD_FAST_HASH_SEED);

  // TODO(user): when the shortcuts are implemented, update BloomFilterStrategies

 * @author Dimitris Andreou
 */
@Immutable
@ElementTypesAreNonnullByDefault
final class Murmur3_128HashFunction extends AbstractHashFunction implements Serializable {
  static final HashFunction MURMUR3_128 = new Murmur3_128HashFunction(0);

  static final HashFunction GOOD_FAST_HASH_128 =
      new Murmur3_128HashFunction(Hashing.GOOD_FAST_HASH_SEED);

  // TODO(user): when the shortcuts are implemented, update BloomFilterStrategies

import javax.annotation.CheckForNull;

/**
 * {@link HashFunction} implementation of SipHash-c-d.
 *
 * @author Kurt Alfred Kluever
 * @author Jean-Philippe Aumasson
 * @author Daniel J. Bernstein
 */
@Immutable
@ElementTypesAreNonnullByDefault
final class SipHashFunction extends AbstractHashFunction implements Serializable {
  static final HashFunction SIP_HASH_24 =

 */
@Immutable
@ElementTypesAreNonnullByDefault
final class Murmur3_32HashFunction extends AbstractHashFunction implements Serializable {
  static final HashFunction MURMUR3_32 =
      new Murmur3_32HashFunction(0, /* supplementaryPlaneFix= */ false);
  static final HashFunction MURMUR3_32_FIXED =
      new Murmur3_32HashFunction(0, /* supplementaryPlaneFix= */ true);

 */
@Immutable
@ElementTypesAreNonnullByDefault
final class Murmur3_32HashFunction extends AbstractHashFunction implements Serializable {
  static final HashFunction MURMUR3_32 =
      new Murmur3_32HashFunction(0, /* supplementaryPlaneFix= */ false);
  static final HashFunction MURMUR3_32_FIXED =
      new Murmur3_32HashFunction(0, /* supplementaryPlaneFix= */ true);

  // k = 00 01 02 ...
  private static final long K0 = 0x0706050403020100L;
  private static final long K1 = 0x0f0e0d0c0b0a0908L;
  private static final HashFunction SIP_WITH_KEY = Hashing.sipHash24(K0, K1);
  private static final HashFunction SIP_WITHOUT_KEY = Hashing.sipHash24();

  // These constants were originally ported from https://www.131002.net/siphash/siphash24.c. See:

import javax.annotation.CheckForNull;

/**
 * {@link HashFunction} implementation of SipHash-c-d.
 *
 * @author Kurt Alfred Kluever
 * @author Jean-Philippe Aumasson
 * @author Daniel J. Bernstein
 */
@Immutable
@ElementTypesAreNonnullByDefault
final class SipHashFunction extends AbstractHashFunction implements Serializable {
  static final HashFunction SIP_HASH_24 =