public void prepareContents() throws Exception {
    mapsImpl = mapEnums.get(implName);
    elems = new CollectionBenchmarkSampleData(elements);
    contents = new HashMap<>();
    for (Element key : elems.getValuesInSet()) {
      contents.put(key, key);
    }
    map = mapsImpl.create(contents);
  }

  @Benchmark
  @Footprint(exclude = Element.class)
  public Map<Element, Element> create() throws Exception {

  @BeforeExperiment
  void setUp() {
    CollectionBenchmarkSampleData sampleData =
        new CollectionBenchmarkSampleData(true, random, 0.8, size);
    setToTest = (Set<Element>) impl.create(sampleData.getValuesInSet());
  }

  @Benchmark
  int iteration(int reps) {
    int x = 0;

    for (int i = 0; i < reps; i++) {
      for (Element y : setToTest) {
        x ^= System.identityHashCode(y);
      }
    }

    this.random = checkNotNull(random);
    this.hitRate = hitRate;
    this.size = size;

    this.valuesInSet = createData();
    this.queries = createQueries(valuesInSet, 1024);
  }

  Set<Element> getValuesInSet() {
    return valuesInSet;
  }

  Element[] getQueries() {
    return queries;
  }

  private Element[] createQueries(Set<Element> elementsInSet, int numQueries) {

    this.random = checkNotNull(random);
    this.hitRate = hitRate;
    this.size = size;

    this.valuesInSet = createData();
    this.queries = createQueries(valuesInSet, 1024);
  }

  Set<Element> getValuesInSet() {
    return valuesInSet;
  }

  Element[] getQueries() {
    return queries;
  }

  private Element[] createQueries(Set<Element> elementsInSet, int numQueries) {