* example, the code:
   *
   * {@snippet :
   * Map<String, Boolean> options =
   *     ImmutableMap.of("verbose", true, "sort", false);
   * EntryTransformer<String, Boolean, String> flagPrefixer =
   *     new EntryTransformer<String, Boolean, String>() {
   *       public String transformEntry(String key, Boolean value) {
   *         return value ? key : "no" + key;
   *       }
   *     };

    }

    @Override
    public Model read(Reader reader, boolean strict, InputSource source) throws IOException, XmlPullParserException {
        return super.read(reader, strict, source);
    }

    @Override
    public Model read(Reader reader, boolean strict) throws IOException, XmlPullParserException {
        return super.read(reader, strict);
    }

    @Override

    }

    @Override
    public boolean isDebugEnabled() {
        return logger.isDebugEnabled();
    }

    @Override
    public boolean isInfoEnabled() {
        return logger.isInfoEnabled();
    }

    @Override
    public boolean isWarnEnabled() {
        return logger.isWarnEnabled();
    }

    @Override
    public boolean isErrorEnabled() {

    assertThat(primitives)
        .containsExactly(
            boolean.class,
            byte.class,
            char.class,
            double.class,
            float.class,
            int.class,
            long.class,
            short.class,
            void.class);

    assertThrows(UnsupportedOperationException.class, () -> primitives.remove(boolean.class));
  }

  public void testAllWrapperTypes() {

    return Maps.valueIterator(multimap.entries().iterator());
  }

  @Override
  public boolean contains(@Nullable Object o) {
    return multimap.containsValue(o);
  }

  @Override
  public int size() {
    return multimap.size();
  }

  @Override
  public boolean remove(@Nullable Object o) {
    Predicate<? super Entry<K, V>> entryPredicate = multimap.entryPredicate();

        this.proxy = proxy;
    }

    @Override
    public boolean isBlacklisted() {
        return false;
    }

    @Override
    public void setBlacklisted(boolean blackListed) {
        // no op
    }

    @Override
    public boolean isUniqueVersion() {
        return true;
    }

    @Override
    public boolean isProjectAware() {
        return false;
    }

    @Override

@GwtCompatible
public abstract class SortedMapInterfaceTest<K, V> extends MapInterfaceTest<K, V> {

  protected SortedMapInterfaceTest(
      boolean allowsNullKeys,
      boolean allowsNullValues,
      boolean supportsPut,
      boolean supportsRemove,
      boolean supportsClear) {
    super(allowsNullKeys, allowsNullValues, supportsPut, supportsRemove, supportsClear);
  }

  @Override

@GwtCompatible
public abstract class SortedMapInterfaceTest<K, V> extends MapInterfaceTest<K, V> {

  protected SortedMapInterfaceTest(
      boolean allowsNullKeys,
      boolean allowsNullValues,
      boolean supportsPut,
      boolean supportsRemove,
      boolean supportsClear) {
    super(allowsNullKeys, allowsNullValues, supportsPut, supportsRemove, supportsClear);
  }

  @Override

  }

  public void testIsEmpty() {
    boolean unused = create().isEmpty();
  }

  public void testRemove() {
    create().remove(null);
  }

  public void testClear() {
    create().clear();
  }

  public void testContainsKey() {
    boolean unused = create().containsKey(null);
  }

  public void testContainsValue() {
    boolean unused = create().containsValue(null);
  }

 * @author Omar Darwish
 * @param <N> Node parameter type
 * @param <V> Value parameter type
 */
class StandardValueGraph<N, V> extends AbstractValueGraph<N, V> {
  private final boolean isDirected;
  private final boolean allowsSelfLoops;
  private final ElementOrder<N> nodeOrder;

  final MapIteratorCache<N, GraphConnections<N, V>> nodeConnections;

  long edgeCount; // must be updated when edges are added or removed