/*
 * Copyright (C) 2012 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.hash;

import com.google.caliper.BeforeExperiment;
import com.google.caliper.Benchmark;
import com.google.caliper.Param;
import com.google.common.hash.HashFunction;

import java.util.Random;

/**
 * Benchmarks for comparing the various {@link HashFunction functions} that we provide.
 *
 * <p>Parameters for the benchmark are:
 * <ul>
 * <li>size: The length of the byte array to hash.
 * <li>hashFunctionEnum: The {@link HashFunction} to use for hashing.
 * </ul>
 *
 * @author Kurt Alfred Kluever
 */
public class HashFunctionBenchmark {

  // Use a statically configured random instance for all of the benchmarks
  private static final Random random = new Random(42);

  @Param({"10", "1000", "100000", "1000000"})
  private int size;

  @Param HashFunctionEnum hashFunctionEnum;

  private byte[] testBytes;

  @BeforeExperiment void setUp() {
    testBytes = new byte[size];
    random.nextBytes(testBytes);
  }

  @Benchmark int hashFunction(int reps) {
    HashFunction hashFunction = hashFunctionEnum.getHashFunction();
    int result = 37;
    for (int i = 0; i < reps; i++) {
      result ^= hashFunction.hashBytes(testBytes).asBytes()[0];
    }
    return result;
  }
}

@@ -745,52 +745,8 @@
 ram;
-%0Aimport com.google.common.hash.HashFunction;
 %0A%0Aim
@@ -1755,11 +1755,308 @@
 ult;%0A  %7D
+%0A%0A  @Benchmark int hashFunctionWithOffset(int reps) %7B%0A    HashFunction hashFunction = hashFunctionEnum.getHashFunction();%0A    int result = 37;%0A    for (int i = 0; i %3C reps; i++) %7B%0A      result %5E= hashFunction.hashBytes(testBytes, 1, testBytes.length - 1).asBytes()%5B0%5D;%0A    %7D%0A    return result;%0A  %7D
 %0A%7D%0A

Remove the array copy from Fingerprint2011.hashBytes(byte[], int, int) method.