if (protocolsCopy != this.protocols) {
          this.routeDatabase = null
        }

        // Assign as an unmodifiable list. This is effectively immutable.
        this.protocols = protocolsCopy.unmodifiable()
      }

    /**
     * Sets the verifier used to confirm that response certificates apply to requested hostnames for
     * HTTPS connections.
     *

   * suitable for testing that map entries cannot be modified via a nefarious implementation of
   * equals. This is used for testing unmodifiable collections of map entries; for example, it
   * should not be possible to access the raw (modifiable) map entry via a nefarious equals method.
   */
  public static <K extends @Nullable Object, V extends @Nullable Object>
      Entry<K, V> nefariousMapEntry(K key, V value) {

   * fewer than {@code k} have been offered, in the order specified by the factory used to create
   * this {@code TopKSelector}.
   *
   * <p>The returned list is an unmodifiable copy and will not be affected by further changes to
   * this {@code TopKSelector}. This method returns in O(k log k) time.
   */
  public List<T> topK() {

     * {@return all source root directories, including the disabled ones, for all languages and scopes}.
     * The iteration order is the order in which the sources are declared in the POM file.
     * The returned collection is unmodifiable.
     *
     * @see #addSourceRoot(SourceRoot)
     */
    public Collection<SourceRoot> getSourceRoots() {
        return Collections.unmodifiableCollection(sources);
    }

    /**

import okhttp3.internal.indexOfFirstNonAsciiWhitespace
import okhttp3.internal.indexOfLastNonAsciiWhitespace
import okhttp3.internal.publicsuffix.PublicSuffixDatabase
import okhttp3.internal.toCanonicalHost
import okhttp3.internal.unmodifiable
import okhttp3.internal.url.FRAGMENT_ENCODE_SET
import okhttp3.internal.url.FRAGMENT_ENCODE_SET_URI
import okhttp3.internal.url.PASSWORD_ENCODE_SET
import okhttp3.internal.url.PATH_SEGMENT_ENCODE_SET

  public abstract String toString();

  /**
   * Returns the value of each present instance from the supplied {@code optionals}, in order,
   * skipping over occurrences of {@link Optional#absent}. Iterators are unmodifiable and are
   * evaluated lazily.
   *
   * <p><b>Comparison to {@code java.util.Optional}:</b> this method has no equivalent in Java 8's
   * {@code Optional} class; use {@code

   * suitable for testing that map entries cannot be modified via a nefarious implementation of
   * equals. This is used for testing unmodifiable collections of map entries; for example, it
   * should not be possible to access the raw (modifiable) map entry via a nefarious equals method.
   */
  public static <K extends @Nullable Object, V extends @Nullable Object>
      Entry<K, V> nefariousMapEntry(K key, V value) {

 * ImmutableGraph<Integer> immutableGraph = ImmutableGraph.copyOf(graph);
 * }
 *
 * <p>Instances of {@link ImmutableGraph} do not implement {@link MutableGraph} (obviously!) and are
 * contractually guaranteed to be unmodifiable and thread-safe.
 *
 * <p>The Guava User Guide has <a
 * href="https://github.com/google/guava/wiki/GraphsExplained#building-graph-instances">more
 * information on (and examples of) building graphs</a>.
 *

 * ImmutableGraph<Integer> immutableGraph = ImmutableGraph.copyOf(graph);
 * }
 *
 * <p>Instances of {@link ImmutableGraph} do not implement {@link MutableGraph} (obviously!) and are
 * contractually guaranteed to be unmodifiable and thread-safe.
 *
 * <p>The Guava User Guide has <a
 * href="https://github.com/google/guava/wiki/GraphsExplained#building-graph-instances">more
 * information on (and examples of) building graphs</a>.
 *

 * }
 *
 * <p>Instances of {@link ImmutableValueGraph} do not implement {@link MutableValueGraph}
 * (obviously!) and are contractually guaranteed to be unmodifiable and thread-safe.
 *
 * <p>The Guava User Guide has <a
 * href="https://github.com/google/guava/wiki/GraphsExplained#building-graph-instances">more
 * information on (and examples of) building graphs</a>.
 *