private static final ImmutableSet<String> TOP_UNDER_REGISTRY_SUFFIX =
      ImmutableSet.of("google.com", "foo.Co.uk", "foo.ca.us.");

  private static final ImmutableSet<String> TOP_PRIVATE_DOMAIN =
      ImmutableSet.of("google.com", "foo.Co.uk", "foo.ca.us.", "foo.blogspot.com");

  private static final ImmutableSet<String> UNDER_TOP_UNDER_REGISTRY_SUFFIX =

  private static final ImmutableSet<String> TOP_UNDER_REGISTRY_SUFFIX =
      ImmutableSet.of("google.com", "foo.Co.uk", "foo.ca.us.");

  private static final ImmutableSet<String> TOP_PRIVATE_DOMAIN =
      ImmutableSet.of("google.com", "foo.Co.uk", "foo.ca.us.", "foo.blogspot.com");

  private static final ImmutableSet<String> UNDER_TOP_UNDER_REGISTRY_SUFFIX =

    registry.register(new ObjectSubscriber());
    assertEquals(3, Iterators.size(registry.getSubscribers("")));
    assertEquals(1, Iterators.size(registry.getSubscribers(new Object())));
    assertEquals(1, Iterators.size(registry.getSubscribers(1)));

    registry.register(new IntegerSubscriber());
    assertEquals(3, Iterators.size(registry.getSubscribers("")));

    registry.register(new ObjectSubscriber());
    assertEquals(3, Iterators.size(registry.getSubscribers("")));
    assertEquals(1, Iterators.size(registry.getSubscribers(new Object())));
    assertEquals(1, Iterators.size(registry.getSubscribers(1)));

    registry.register(new IntegerSubscriber());
    assertEquals(3, Iterators.size(registry.getSubscribers("")));

   * of the Mozilla Foundation's <a href="http://publicsuffix.org/">Public Suffix List</a> (PSL). A
   * registry suffix is one under which Internet users can directly register names via a domain name
   * registrar, and have such registrations lawfully protected by internet-governing bodies such as

    }

    stack.push(reverse(encoded.subSequence(start, idx)));

    if (c == '!' || c == '?' || c == ':' || c == ',') {
      // '!' represents an interior node that represents a REGISTRY entry in the map.
      // '?' represents a leaf node, which represents a REGISTRY entry in map.
      // ':' represents an interior node that represents a private entry in the map
      // ',' represents a leaf node, which represents a private entry in the map.

import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CopyOnWriteArraySet;
import javax.annotation.CheckForNull;

/**
 * Registry of subscribers to a single event bus.
 *
 * @author Colin Decker
 */
@ElementTypesAreNonnullByDefault
final class SubscriberRegistry {

  /**
   * All registered subscribers, indexed by event type.
   *

@GwtCompatible
public enum PublicSuffixType {

  /** Public suffix that is provided by a private company, e.g. "blogspot.com" */
  PRIVATE(':', ','),
  /** Public suffix that is backed by an ICANN-style domain name registry */
  REGISTRY('!', '?');

  /** The character used for an inner node in the trie encoding */
  private final char innerNodeCode;

  /** The character used for a leaf node in the trie encoding */