*     source-compatible</a> since 4.0)
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
/*
 * The type parameter is <T> rather than <T extends @Nullable> so that we can use T in the
 * doEquivalent and doHash methods to indicate that the parameter cannot be null.
 */
public abstract class Equivalence<T> implements BiPredicate<@Nullable T, @Nullable T> {
  /** Constructor for use by subclasses. */
  protected Equivalence() {}

 *     source-compatible</a> since 4.0)
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
/*
 * The type parameter is <T> rather than <T extends @Nullable> so that we can use T in the
 * doEquivalent and doHash methods to indicate that the parameter cannot be null.
 */
public abstract class Equivalence<T>
{
  /** Constructor for use by subclasses. */
  protected Equivalence() {}

  /**

  }

  @Override
  protected boolean doEquivalent(F a, F b) {
    return resultEquivalence.equivalent(function.apply(a), function.apply(b));
  }

  @Override
  protected int doHash(F a) {
    return resultEquivalence.hash(function.apply(a));
  }

  @Override
  public boolean equals(@CheckForNull Object obj) {
    if (obj == this) {
      return true;
    }

      if (!elementEquivalence.equivalent(iteratorA.next(), iteratorB.next())) {
        return false;
      }
    }

    return !iteratorA.hasNext() && !iteratorB.hasNext();
  }

  @Override
  protected int doHash(Iterable<T> iterable) {
    int hash = 78721;
    for (T element : iterable) {
      hash = hash * 24943 + elementEquivalence.hash(element);
    }
    return hash;
  }

  @Override

  }

  @Override
  protected boolean doEquivalent(F a, F b) {
    return resultEquivalence.equivalent(function.apply(a), function.apply(b));
  }

  @Override
  protected int doHash(F a) {
    return resultEquivalence.hash(function.apply(a));
  }

  @Override
  public boolean equals(@CheckForNull Object obj) {
    if (obj == this) {
      return true;
    }

      if (!elementEquivalence.equivalent(iteratorA.next(), iteratorB.next())) {
        return false;
      }
    }

    return !iteratorA.hasNext() && !iteratorB.hasNext();
  }

  @Override
  protected int doHash(Iterable<T> iterable) {
    int hash = 78721;
    for (T element : iterable) {
      hash = hash * 24943 + elementEquivalence.hash(element);
    }
    return hash;
  }

  @Override

    }

    @Override
    protected boolean doEquivalent(Object a, Object b) {
      return equivalentExpectations.get(a, b);
    }

    @Override
    protected int doHash(Object object) {
      return hashExpectations.get(object);
    }

    void checkRecording() {
      checkState(equivalentExpectations == null && hashExpectations == null);
    }
  }

    }

    @Override
    protected boolean doEquivalent(Object a, Object b) {
      return equivalentExpectations.get(a, b);
    }

    @Override
    protected int doHash(Object object) {
      return hashExpectations.get(object);
    }

    void checkRecording() {
      checkState(equivalentExpectations == null && hashExpectations == null);
    }
  }

    return new Equivalence<T>() {
      @Override
      protected boolean doEquivalent(T a, T b) {
        return false;
      }

      @Override
      protected int doHash(T t) {
        return 0;
      }

      final String string = paramString(Equivalence.class, generateInt());

      @Override
      public String toString() {
        return string;
      }

    return new Equivalence<T>() {
      @Override
      protected boolean doEquivalent(T a, T b) {
        return false;
      }

      @Override
      protected int doHash(T t) {
        return 0;
      }

      final String string = paramString(Equivalence.class, generateInt());

      @Override
      public String toString() {
        return string;
      }