}

  @LazyInit private transient @Nullable Map<R, Map<C, V>> rowMap;

  @Override
  public Map<R, Map<C, V>> rowMap() {
    Map<R, Map<C, V>> result = rowMap;
    return (result == null) ? rowMap = createRowMap() : result;
  }

  Map<R, Map<C, V>> createRowMap() {
    return new RowMap();
  }

  @WeakOuter
  class RowMap extends ViewCachingAbstractMap<R, Map<C, V>> {
    @Override

import java.lang.annotation.RetentionPolicy;
import java.util.Map;
import java.util.Set;

/**
 * Optional features of classes derived from {@code Map}.
 *
 * @author George van den Driessche
 */
@SuppressWarnings("rawtypes") // maybe avoidable if we rework the whole package?
@GwtCompatible
public enum MapFeature implements Feature<Map> {
  /**

  }

  public void testCopyOf_map_empty() {
    Map<Class<?>, Object> in = emptyMap();
    ClassToInstanceMap<Object> map = ImmutableClassToInstanceMap.copyOf(in);
    assertTrue(map.isEmpty());
    assertThat(map).isSameInstanceAs(ImmutableClassToInstanceMap.of());
    assertThat(ImmutableClassToInstanceMap.copyOf(map)).isSameInstanceAs(map);
  }

  public void testOf_zero() {

        hoge.setA("A");
        hoge.setB(true);
        hoge.setC(3);
        final Map<String, Object> map = newHashMap();
        BeanUtil.copyBeanToMap(hoge, map);
        assertThat(map, is(notNullValue()));
        assertThat(map.get("a"), is((Object) "A"));
        assertThat(map.get("b"), is((Object) true));
        assertThat(map.get("c"), is((Object) 3));
    }

    /**
     * @throws Exception
     */

    MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(createMapMaker());

    assertThat(map.keyStrength()).isEqualTo(Strength.STRONG);
    assertThat(map.valueStrength()).isEqualTo(Strength.STRONG);
    assertThat(map.keyEquivalence).isEqualTo(map.keyStrength().defaultEquivalence());
    assertThat(map.valueEquivalence()).isEqualTo(map.valueStrength().defaultEquivalence());

    assertThat(map.entryHelper)

    MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(createMapMaker());

    assertThat(map.keyStrength()).isEqualTo(Strength.STRONG);
    assertThat(map.valueStrength()).isEqualTo(Strength.STRONG);
    assertThat(map.keyEquivalence).isEqualTo(map.keyStrength().defaultEquivalence());
    assertThat(map.valueEquivalence()).isEqualTo(map.valueStrength().defaultEquivalence());

    assertThat(map.entryHelper)

        Map<String, String> phases = new LinkedHashMap<>();
        for (Map.Entry<String, LifecyclePhase> e : lphases.entrySet()) {
            phases.put(e.getKey(), e.getValue().toString());
        }
        return phases;
    }

    @Deprecated
    public void setPhases(Map<String, String> phases) {
        Map<String, LifecyclePhase> lphases = new LinkedHashMap<>();
        for (Map.Entry<String, String> e : phases.entrySet()) {

        dataStoreParams.put("key3", null);

        Map<String, Object> map = dataStoreParams.asMap();

        assertNotNull(map);
        assertEquals(3, map.size());
        assertEquals("value1", map.get("key1"));
        assertEquals(123, map.get("key2"));
        assertNull(map.get("key3"));

        // Verify that returned map is a copy
        map.put("key4", "value4");

     */
    public static ParameterizedClassDesc createParameterizedClassDesc(final Field field, final Map<TypeVariable<?>, Type> map) {
        assertArgumentNotNull("field", field);
        assertArgumentNotNull("map", map);

        return createParameterizedClassDesc(field.getGenericType(), map);
    }

    /**

    IntHolder holderB = new IntHolder(2);
    Map<String, IntHolder> map = ImmutableSortedMap.of("a", holderA, "b", holderB);
    holderA.value = 3;
    assertTrue(map.entrySet().contains(immutableEntry("a", new IntHolder(3))));
    Map<String, Integer> intMap = ImmutableSortedMap.of("a", 3, "b", 2);
    assertEquals(intMap.hashCode(), map.entrySet().hashCode());
    assertEquals(intMap.hashCode(), map.hashCode());
  }

  @J2ktIncompatible