import static java.lang.Long.rotateRight;

import com.google.common.annotations.VisibleForTesting;

/**
 * Implementation of Geoff Pike's fingerprint2011 hash function. See {@link Hashing#fingerprint2011}
 * for information on the behaviour of the algorithm.
 *
 * <p>On Intel Core2 2.66, on 1000 bytes, fingerprint2011 takes 0.9 microseconds compared to
 * fingerprint at 4.0 microseconds and md5 at 4.5 microseconds.
 *

   * <a href="https://en.wikipedia.org/wiki/Hash_function">hash function</a>.
   *
   * @since 31.1
   */
  public static HashFunction fingerprint2011() {
    return Fingerprint2011.FINGERPRINT_2011;
  }

  /**
   * Assigns to {@code hashCode} a "bucket" in the range {@code [0, buckets)}, in a uniform manner

    HashTestUtils.check2BitAvalanche(Hashing.fingerprint2011(), 100, 0.4);
    HashTestUtils.checkAvalanche(Hashing.fingerprint2011(), 100, 0.4);
    HashTestUtils.checkNo2BitCharacteristics(Hashing.fingerprint2011());
    HashTestUtils.checkNoFunnels(Hashing.fingerprint2011());
    HashTestUtils.assertInvariants(Hashing.fingerprint2011());
    assertThat(Hashing.fingerprint2011().toString()).isEqualTo("Hashing.fingerprint2011()");
  }