private @Nullable EnumSet<E> set;

    void add(E e) {
      if (set == null) {
        set = EnumSet.of(e);
      } else {
        set.add(e);
      }
    }

    EnumSetAccumulator<E> combine(EnumSetAccumulator<E> other) {
      if (this.set == null) {
        return other;
      } else if (other.set == null) {
        return this;
      } else {
        this.set.addAll(other.set);

        pageSize = getDefaultPageSize();
        currentPageNumber = getDefaultCurrentPageNumber();

        id = null;
        term = null;
        query = null;
        maxSize = null;
        boost = null;
        createdBy = null;
        createdTime = null;
        versionNo = null;

    }

    /**
     * Returns the default current page number.
     *

        if (createdBy != null) {
            addFieldToSource(sourceMap, "createdBy", createdBy);
        }
        if (createdTime != null) {
            addFieldToSource(sourceMap, "createdTime", createdTime);
        }
        if (name != null) {
            addFieldToSource(sourceMap, "name", name);
        }
        if (sortOrder != null) {
            addFieldToSource(sourceMap, "sortOrder", sortOrder);

    } catch (RuntimeException tolerated) {
      // GWT's HashMap.entrySet().removeAll(null) doesn't throws NPE.
    }
  }

  @Override
  public void testEntrySetRetainAllNullFromEmpty() {
    try {
      super.testEntrySetRetainAllNullFromEmpty();
    } catch (RuntimeException tolerated) {
      // GWT's HashMap.entrySet().retainAll(null) doesn't throws NPE.
    }
  }

  @Override

 * whose next element can always be derived from the previous element. Null elements are not
 * supported, nor is the {@link #remove()} method.
 *
 * <p>Example:
 *
 * {@snippet :
 * Iterator<Integer> powersOfTwo =
 *     new AbstractSequentialIterator<Integer>(1) {
 *       protected Integer computeNext(Integer previous) {
 *         return (previous == 1 << 30) ? null : previous * 2;
 *       }
 *     };
 * }
 *

        final MethodDesc methodDesc = beanDesc.getMethodDescNoException(name);
        if (methodDesc == null) {
            return null;
        }
        final Object value = methodDesc.invoke(annotation);
        if (value == null || "".equals(value)) {
            return null;
        }
        return value;
    }

        ElevateWord elevateWord2 =
                new ElevateWord("hoge", 2.0f, Collections.singletonList("hoge"), Collections.singletonList("content"), null, null);
        ElevateWord elevateWord3 =
                new ElevateWord("fuga", 2.0f, Collections.singletonList("fuga"), Collections.singletonList("content"), null, null);

   */

  /**
   * Creates a new instance with {@code null} as its detail message and no cause.
   *
   * @deprecated Prefer {@linkplain ExecutionError(Error)} a constructor that accepts a cause: Users
   *     of this class typically expect for instances to have a non-null cause. At the moment, you
   *     can <i>usually</i> still preserve behavior by passing an explicit {@code null} cause. Note,

  private Set<DurationSpec> expireAfterAccesses = Sets.newHashSet((DurationSpec) null);
  private Set<DurationSpec> refreshes = Sets.newHashSet((DurationSpec) null);
  private Set<Strength> keyStrengths = Sets.newHashSet((Strength) null);
  private Set<Strength> valueStrengths = Sets.newHashSet((Strength) null);

  @CanIgnoreReturnValue
  CacheBuilderFactory withConcurrencyLevels(Set<Integer> concurrencyLevels) {

      // null?  no problem
    }

    public static void staticOneArgJsr305NullableCorrectlyDoesNotThrowNpe(
        @javax.annotation.Nullable String s) {
      // null?  no problem
    }

    public static void staticOneArgNullableCorrectlyDoesNotThrowNpe(@Nullable String s) {
      // null?  no problem
    }