* href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>. The {@link
 * #delegate()} method must be overridden to return the instance being decorated.
 *
 * <p>This class does <i>not</i> forward the {@code hashCode} and {@code equals} methods through to
 * the backing object, but relies on {@code Object}'s implementation. This is necessary to preserve

        return this.first.equals(that.first) && this.second.equals(that.second);
      }
      return false;
    }

    @Override
    public int hashCode() {
      return 31 * first.hashCode() + second.hashCode();
    }

    @Override
    public String toString() {
      return first + ".andThen(" + second + ")";
    }

    private static final long serialVersionUID = 0L;
  }

        assertEquals(0, c1.compareTo(c2), "expected " + v1 + " == " + v2);
        assertEquals(0, c2.compareTo(c1), "expected " + v2 + " == " + v1);
        assertEquals(c1.hashCode(), c2.hashCode(), "expected same hashcode for " + v1 + " and " + v2);
        assertEquals(c1, c2, "expected " + v1 + ".equals( " + v2 + " )");
        assertEquals(c2, c1, "expected " + v2 + ".equals( " + v1 + " )");
    }

        }
      }
      return true;
    }

    // Because we happen to use the same formula. If that changes, just don't override this.
    @Override
    public int hashCode() {
      return parent.hashCode();
    }

    @Override
    public String toString() {
      return parent.toString();
    }
  }

  /**

        }
      }
      return true;
    }

    // Because we happen to use the same formula. If that changes, just don't override this.
    @Override
    public int hashCode() {
      return parent.hashCode();
    }

    @Override
    public String toString() {
      return parent.toString();
    }
  }

  /**

  /** An implementation of {@link List#hashCode()}. */
  static int hashCodeImpl(List<?> list) {
    // TODO(lowasser): worth optimizing for RandomAccess?
    int hashCode = 1;
    for (Object o : list) {
      hashCode = 31 * hashCode + (o == null ? 0 : o.hashCode());

      hashCode = ~~hashCode;
      // needed to deal with GWT integer overflow
    }
    return hashCode;
  }

    }

    @Override
    public boolean equals(@Nullable Object obj) {
      return this == obj || (obj instanceof Element && ((Element) obj).hash == hash);
    }

    @Override
    public int hashCode() {
      return hash;
    }

    @Override
    public int compareTo(Element that) {
      return Integer.compare(hash, that.hash);
    }

    @Override
    public String toString() {

            Objects.equals(parameters, that.parameters) &&
            Objects.equals(returnType, that.returnType);
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), name, ownerClass, parameters, returnType);
    }

    public ClassMetaData getOwnerClass() {
        return ownerClass;
    }

    public TypeMetaData getReturnType() {

        RangeMap<?, ?> rangeMap = (RangeMap<?, ?>) o;
        return asMapOfRanges().equals(rangeMap.asMapOfRanges());
      }
      return false;
    }

    @Override
    public int hashCode() {
      return asMapOfRanges().hashCode();
    }

    @Override
    public String toString() {
      return asMapOfRanges().toString();
    }

    class SubRangeMapAsMap extends AbstractMap<Range<K>, V> {

    @Test
    void testHashCode() {
        ArtifactVersion v1 = newArtifactVersion("1");
        ArtifactVersion v2 = newArtifactVersion("1.0");
        assertTrue(v1.equals(v2));
        assertEquals(v1.hashCode(), v2.hashCode());
    }

    @Test
    void testEqualsNullSafe() {
        assertFalse(newArtifactVersion("1").equals(null));
    }

    @Test
    void testEqualsTypeSafe() {