checkState(this.removalListener == null);

    // safely limiting the kinds of caches this can produce
    @SuppressWarnings("unchecked")
    CacheBuilder<K1, V1> me = (CacheBuilder<K1, V1>) this;
    me.removalListener = checkNotNull(listener);
    return me;
  }

  // Make a safe contravariant cast now so we don't have to do it over and over.
  @SuppressWarnings("unchecked")

 * creation methods appear to adhere doggedly to the original intent of the "mapped" address: all
 * "mapped" addresses return {@link Inet4Address} objects.
 *
 * <p>For added safety, it is common for IPv6 network operators to filter all packets where either
 * the source or destination address appears to be a "compat" or "mapped" address. Filtering

sa
sa-east-1.elasticbeanstalk.com
sa.au
sa.com
sa.cr
sa.edu.au
sa.gov.au
sa.gov.pl
sa.it
sa.ngrok.io
saarland
sabae.fukui.jp
sadist.jp
sado.niigata.jp
safe
safety
safety.aero
saga.jp
saga.saga.jp
sagae.yamagata.jp
sagamihara.kanagawa.jp
saigawa.fukuoka.jp
saijo.ehime.jp
saikai.nagasaki.jp
saiki.oita.jp
saitama.jp
saitama.saitama.jp

// saarland : dotSaarland GmbH
// https://www.iana.org/domains/root/db/saarland.html
saarland

// safe : Amazon Registry Services, Inc.
// https://www.iana.org/domains/root/db/safe.html
safe

// safety : Safety Registry Services, LLC.
// https://www.iana.org/domains/root/db/safety.html
safety

// sakura : SAKURA Internet Inc.
// https://www.iana.org/domains/root/db/sakura.html
sakura

  - [beta] PodDisruptionBudget has been promoted to beta, can be used to safely drain nodes while respecting application SLO's ([docs](http://kubernetes.io/docs/tasks/administer-cluster/safely-drain-node/)) ([kubernetes/features#85](https://github.com/kubernetes/enhancements/issues/85))
- **UI**

sa
sa-east-1.elasticbeanstalk.com
sa.au
sa.com
sa.cr
sa.edu.au
sa.gov.au
sa.gov.pl
sa.it
sa.ngrok.io
saarland
sabae.fukui.jp
sadist.jp
sado.niigata.jp
safe
safety
safety.aero
saga.jp
saga.saga.jp
sagae.yamagata.jp
sagamihara.kanagawa.jp
saigawa.fukuoka.jp
saijo.ehime.jp
saikai.nagasaki.jp
saiki.oita.jp
saitama.jp
saitama.saitama.jp

  /**
   * Returns an {@link Escaper} instance that escapes special characters in a string so it can
   * safely be included in an XML document as element content. See section <a
   * href="http://www.w3.org/TR/2008/REC-xml-20081126/#syntax">2.4</a> of the XML specification.
   *
   * <p><b>Note:</b> Double and single quotes are not escaped, so it is <b>not safe</b> to use this

 *
 * <p>This class is not thread safe.
 *
 * @author Ben Yu
 */
abstract class TypeVisitor {

  private final Set<Type> visited = new HashSet<>();

  /**
   * Visits the given types. Null types are ignored. This allows subclasses to call {@code
   * visit(parameterizedType.getOwnerType())} safely without having to check nulls.
   */

   */
  @SuppressWarnings("unchecked") // Safe as long as the javadocs are followed
  static <K, V> ImmutableMapEntry<K, V>[] createEntryArray(int size) {
    return (ImmutableMapEntry<K, V>[]) new ImmutableMapEntry<?, ?>[size];
  }

  ImmutableMapEntry(K key, V value) {
    super(key, value);
    checkEntryNotNull(key, value);
  }

  // Redeclare methods to make them `final`, just to be extra-safe.

  @Override
  @ParametricNullness

 * evicted or manually invalidated. The common way to build instances is using {@link CacheBuilder}.
 *
 * <p>Implementations of this interface are expected to be thread-safe, and can be safely accessed
 * by multiple concurrent threads.
 *
 * @param <K> the type of the cache's keys, which are not permitted to be null
 * @param <V> the type of the cache's values, which are not permitted to be null