*/
@GwtCompatible
abstract class AbstractMultiset<E extends @Nullable Object> extends AbstractCollection<E>
    implements Multiset<E> {
  // Query Operations

  @Override
  public boolean isEmpty() {
    return entrySet().isEmpty();
  }

  @Override
  public boolean contains(@Nullable Object element) {
    return count(element) > 0;
  }

  // Modification Operations
  @CanIgnoreReturnValue
  @Override

     * @return true if the document matches the expression, false otherwise
     */
    public boolean match(final Map<String, Object> map) {

        if (map == null || map.isEmpty() || matchExpression == null) {
            return false;
        }

        final Object value = ComponentUtil.getScriptEngineFactory().getScriptEngine(scriptType).evaluate(matchExpression, map);

    private static final Logger logger = LogManager.getLogger(WebAuthentication.class);

    private WebConfig webConfig;

    public WebAuthenticationConfig getWebAuthenticationConfig() {
        if (StringUtil.isEmpty(getUsername())) {
            throw new CrawlerSystemException(
                    "Username is empty in WebAuthentication configuration. A valid username must be provided for authentication.");
        }

      Key key = new Key(1);
      String value = key.toString();
      assertThat(cache.getUnchecked(key)).isSameInstanceAs(value);
      assertThat(cache.asMap().isEmpty()).isFalse();
      cache.invalidateAll();
      assertThat(cache.size()).isEqualTo(0);
      assertThat(cache.asMap().isEmpty()).isTrue();
      assertThat(cache.asMap().containsKey(key)).isFalse();
      assertThat(cache.asMap().containsValue(value)).isFalse();
    }
  }

    }

    /**
     *
     */
    @Test
    public void testIsEmpty() {
        assertTrue(StringUtil.isEmpty(null));
        assertTrue(StringUtil.isEmpty(""));
        assertFalse(StringUtil.isEmpty(" "));
    }

    /**
     *
     */
    @Test
    public void testIsNotEmpty() {
        assertFalse(StringUtil.isNotEmpty(null));

import static java.text.DateFormat.SHORT;
import static java.text.DateFormat.getDateInstance;
import static org.codelibs.core.collection.MultiIterator.iterable;
import static org.codelibs.core.lang.StringUtil.isEmpty;
import static org.codelibs.core.lang.StringUtil.isNotEmpty;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotNull;

import java.text.DateFormat;
import java.text.ParsePosition;

  }

  @Override
  public int size() {
    synchronized (lock) {
      return cachingHashMap.size();
    }
  }

  @Override
  public boolean isEmpty() {
    synchronized (lock) {
      return cachingHashMap.isEmpty();
    }
  }

  @Override
  public @Nullable V get(@Nullable Object key) {
    Timestamped<V> value;
    synchronized (lock) {
      checkNotNull(key);

        if (!loaded.isEmpty()) {
            result.add(new CoreExtensions(file, loaded));
        }

        // user
        file = context.userHomeDirectory.resolve(eff.get(Constants.MAVEN_USER_EXTENSIONS));
        loaded = readCoreExtensionsDescriptorFromFile(file, true);
        if (!loaded.isEmpty()) {
            result.add(new CoreExtensions(file, loaded));
        }

    bimap = EnumHashBiMap.create(emptyBimap);
    assertTrue(bimap.isEmpty());

    /* Map can be empty if it's an EnumBiMap. */
    Map<Currency, Country> emptyBimap2 = EnumBiMap.create(Currency.class, Country.class);
    EnumHashBiMap<Currency, Country> bimap2 = EnumHashBiMap.create(emptyBimap2);
    assertTrue(bimap2.isEmpty());
  }

  public void testEnumHashBiMapConstructor() {

  }

  @Override
  public @Nullable K higherKey(K key) {
    return delegate.higherKey(checkValid(key));
  }

  @Override
  public boolean isEmpty() {
    return delegate.isEmpty();
  }

  @Override
  public NavigableSet<K> keySet() {
    return navigableKeySet();
  }

  @Override
  public @Nullable Entry<K, V> lastEntry() {