ImmutableMap.Builder::combine,
        ImmutableMap.Builder::buildOrThrow);
  }

  static <T extends @Nullable Object, K, V> Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
      Function<? super T, ? extends K> keyFunction,
      Function<? super T, ? extends V> valueFunction,
      BinaryOperator<V> mergeFunction) {
    checkNotNull(keyFunction);
    checkNotNull(valueFunction);
    checkNotNull(mergeFunction);

@GwtCompatible
final class ExplicitOrdering<T> extends Ordering<T> implements Serializable {
  final ImmutableMap<T, Integer> rankMap;

  ExplicitOrdering(List<T> valuesInOrder) {
    this(Maps.indexMap(valuesInOrder));
  }

  ExplicitOrdering(ImmutableMap<T, Integer> rankMap) {
    this.rankMap = rankMap;
  }

  @Override
  public int compare(T left, T right) {

@GwtCompatible
final class ExplicitOrdering<T> extends Ordering<T> implements Serializable {
  final ImmutableMap<T, Integer> rankMap;

  ExplicitOrdering(List<T> valuesInOrder) {
    this(Maps.indexMap(valuesInOrder));
  }

  ExplicitOrdering(ImmutableMap<T, Integer> rankMap) {
    this.rankMap = rankMap;
  }

  @Override
  public int compare(T left, T right) {

          + "enim, at feugiat leo magna nec libero. Mauris quis odio eget nisl rutrum cursus nec "
          + "eget augue. Sed nec arcu sem. In hac habitasse platea dictumst.";

  static final ImmutableMap<String, String> TEST_STRINGS =
      ImmutableMap.<String, String>builder()
          .put("empty", "")
          .put("1 char", "0")
          .put("1 word", "hello")
          .put("2 words", "hello world")

   *
   * @since 2.0
   */
  public static final class Builder<B> {
    /** Creates a new builder. */
    public Builder() {}

    private final ImmutableMap.Builder<Class<? extends B>, B> mapBuilder = ImmutableMap.builder();

    /**
     * Associates {@code key} with {@code value} in the built map. Duplicate keys are not allowed,
     * and will cause {@link #build} to fail.
     */

    Map<Number, Number> map5 = ImmutableMap.<Number, Number>of(1, 2);
    Map<Number, Integer> map6 = ImmutableMap.<Number, Integer>of(1, 2);
    Map<Integer, Object> map7 = ImmutableMap.<Integer, Object>of(1, 2);
    Map<Integer, Number> map8 = ImmutableMap.<Integer, Number>of(1, 2);
    Map<Integer, Integer> map9 = ImmutableMap.<Integer, Integer>of(1, 2);
    Map<? extends Number, ? extends Number> map0 = ImmutableMap.of(1, 2);

import com.google.common.collect.ImmutableMap;
import com.google.common.escape.testing.EscaperAsserts;
import java.io.IOException;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;

/**
 * @author David Beaumont
 */
@GwtCompatible
@NullMarked
public class ArrayBasedUnicodeEscaperTest extends TestCase {
  private static final ImmutableMap<Character, String> NO_REPLACEMENTS = ImmutableMap.of();

   *
   * @since 2.0
   */
  public static final class Builder<B> {
    /** Creates a new builder. */
    public Builder() {}

    private final ImmutableMap.Builder<Class<? extends B>, B> mapBuilder = ImmutableMap.builder();

    /**
     * Associates {@code key} with {@code value} in the built map. Duplicate keys are not allowed,
     * and will cause {@link #build} to fail.
     */

  static CharEscaper createSimpleCharEscaper(ImmutableMap<Character, char[]> replacementMap) {
    return new CharEscaper() {
      @Override
      protected char @Nullable [] escape(char c) {
        return replacementMap.get(c);
      }
    };
  }

  // A trivial non-optimized escaper for testing.
  static UnicodeEscaper createSimpleUnicodeEscaper(ImmutableMap<Integer, char[]> replacementMap) {

final class ImmutableEnumMap<K extends Enum<K>, V> extends IteratorBasedImmutableMap<K, V> {
  static <K extends Enum<K>, V> ImmutableMap<K, V> asImmutable(EnumMap<K, V> map) {
    switch (map.size()) {
      case 0:
        return ImmutableMap.of();
      case 1:
        Entry<K, V> entry = getOnlyElement(map.entrySet());
        return ImmutableMap.of(entry.getKey(), entry.getValue());
      default:
        return new ImmutableEnumMap<>(map);
    }
  }