* @return The updated source map.
     */
    public Map<String, Object> getUpdatedSource(final Map<String, Object> existingSource) {
        final Map<String, Object> map = new HashMap<>();
        map.put(FieldNames.TEXT, text);

        for (int i = 0; i < readings.length; i++) {
            final Object readingObj = existingSource.get(FieldNames.READING_PREFIX + i);
            if (readingObj instanceof List) {

      @GwtIncompatible // serialization
      Object writeReplace() {
        return super.writeReplace();
      }
    };
  }

  @Override
  public int size() {
    return axesSizeProduct[0];
  }

  @Override
  public boolean contains(@Nullable Object object) {
    if (!(object instanceof List)) {
      return false;
    }
    List<?> list = (List<?>) object;
    if (list.size() != axes.size()) {

   * result from the user invoking {@link Cache#put}, {@link LoadingCache#refresh}, {@link Map#put},
   * {@link Map#putAll}, {@link ConcurrentMap#replace(Object, Object)}, or {@link
   * ConcurrentMap#replace(Object, Object, Object)}.
   */
  REPLACED {
    @Override
    boolean wasEvicted() {
      return false;
    }
  },

  /**

    SettableFuture<String> settable = SettableFuture.create();
    ListenableFuture<?> f = settable;
    FutureCallback<@Nullable Object> callback =
        new FutureCallback<@Nullable Object>() {
          @Override
          public void onSuccess(@Nullable Object result) {}

          @Override
          public void onFailure(Throwable t) {}
        };
    addCallback(f, callback, directExecutor());
  }

   */
  protected NavigableSet<K> standardDescendingKeySet() {
    return descendingMap().navigableKeySet();
  }

  /**
   * A sensible definition of {@link #subMap(Object, Object)} in terms of {@link #subMap(Object,
   * boolean, Object, boolean)}. If you override {@code subMap(K, boolean, K, boolean)}, you may
   * wish to override {@code subMap} to forward to this implementation.
   */
  @Override

   */
  protected NavigableSet<K> standardDescendingKeySet() {
    return descendingMap().navigableKeySet();
  }

  /**
   * A sensible definition of {@link #subMap(Object, Object)} in terms of {@link #subMap(Object,
   * boolean, Object, boolean)}. If you override {@code subMap(K, boolean, K, boolean)}, you may
   * wish to override {@code subMap} to forward to this implementation.
   */
  @Override

/**
 * Implementation of {@link Multimaps#filterKeys(Multimap, Predicate)}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
class FilteredKeyMultimap<K extends @Nullable Object, V extends @Nullable Object>
    extends AbstractMultimap<K, V> implements FilteredMultimap<K, V> {
  final Multimap<K, V> unfiltered;
  final Predicate<? super K> keyPredicate;

/**
 * Implementation of {@link Multimaps#filterKeys(Multimap, Predicate)}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
class FilteredKeyMultimap<K extends @Nullable Object, V extends @Nullable Object>
    extends AbstractMultimap<K, V> implements FilteredMultimap<K, V> {
  final Multimap<K, V> unfiltered;
  final Predicate<? super K> keyPredicate;

    /**
     * Sets the value of the {@link Field}.
     *
     * @param target
     *            the target object. Must not be {@literal null}
     * @param value
     *            the value of the {@link Field}
     */
    void setFieldValue(Object target, Object value);

    /**
     * Sets the value of the static {@link Field}.
     *
     * @param value

     *            the property type
     * @param target
     *            the target object. Must not be {@literal null}
     * @return the property value
     */
    <T> T getValue(Object target);

    /**
     * Sets the value of the property.
     *
     * @param target
     *            the target object. Must not be {@literal null}
     * @param value
     *            the value to set to the property