import java.io.Serializable;
import javax.annotation.CheckForNull;

/**
 * List returned by {@link ImmutableCollection#asList} that delegates {@code contains} checks to the
 * backing collection.
 *
 * @author Jared Levy
 * @author Louis Wasserman
 */
@GwtCompatible(serializable = true, emulated = true)
@SuppressWarnings("serial")
@ElementTypesAreNonnullByDefault
abstract class ImmutableAsList<E> extends ImmutableList<E> {

import java.util.Collections;
import java.util.List;

/**
 * An abstract {@code TestMultisetGenerator} for generating multisets containing enum values.
 *
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class TestEnumMultisetGenerator implements TestMultisetGenerator<AnEnum> {
  @Override
  public SampleElements<AnEnum> samples() {

import com.google.common.collect.testing.SampleElements;
import com.google.common.collect.testing.SampleElements.Strings;
import java.util.List;

/**
 * Create multisets of strings for tests.
 *
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class TestStringMultisetGenerator implements TestMultisetGenerator<String> {
  @Override
  public SampleElements<String> samples() {

import java.util.Collections;
import java.util.List;
import java.util.SortedSet;

/**
 * Create string sets for testing collections that are sorted by natural ordering.
 *
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class TestStringSortedSetGenerator extends TestStringSetGenerator
    implements TestSortedSetGenerator<String> {

  @Override

import java.util.ArrayList;
import java.util.List;

/**
 * Creates, based on your criteria, a JUnit test suite that exhaustively tests a queue
 * implementation.
 *
 * @author Jared Levy
 */
@GwtIncompatible
public final class QueueTestSuiteBuilder<E>
    extends AbstractCollectionTestSuiteBuilder<QueueTestSuiteBuilder<E>, E> {

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Multiset implementation that uses hashing for key and entry access.
 *
 * @author Kevin Bourrillion
 * @author Jared Levy
 * @since 2.0
 */
@GwtCompatible(serializable = true, emulated = true)
@ElementTypesAreNonnullByDefault
public final class HashMultiset<E extends @Nullable Object> extends AbstractMapBasedMultiset<E> {

import java.util.Collections;
import java.util.List;

/**
 * An abstract {@code TestMultisetGenerator} for generating multisets containing enum values.
 *
 * @author Jared Levy
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class TestEnumMultisetGenerator implements TestMultisetGenerator<AnEnum> {
  @Override
  public SampleElements<AnEnum> samples() {

import java.util.Arrays;
import java.util.Map;
import java.util.Map.Entry;

/**
 * Generators of various {@link com.google.common.collect.BiMap}s and derived collections.
 *
 * @author Jared Levy
 * @author Hayward Chan
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public class BiMapGenerators {
  public static class ImmutableBiMapGenerator extends TestStringBiMapGenerator {
    @Override

 * limitations under the License.
 */

package com.google.common.collect;

import java.util.HashMap;

/**
 * GWT emulation of {@link RegularImmutableBiMap}.
 *
 * @author Jared Levy
 * @author Hayward Chan
 */
@ElementTypesAreNonnullByDefault
@SuppressWarnings("serial")
class RegularImmutableBiMap<K, V> extends ImmutableBiMap<K, V> {
  static final RegularImmutableBiMap<Object, Object> EMPTY =

package com.google.common.collect;

import com.google.common.annotations.GwtCompatible;
import java.util.Collection;

/**
 * Implementation of {@link ImmutableListMultimap} with no entries.
 *
 * @author Jared Levy
 */
@GwtCompatible(serializable = true)
@ElementTypesAreNonnullByDefault
class EmptyImmutableListMultimap extends ImmutableListMultimap<Object, Object> {