}

    /** Creates a class loader with the given base URL as its classpath. */
    URLClassLoader newLoader(URL base) {
      // We use the bootstrap class loader as the parent because Finalizer by design uses
      // only standard Java classes. That also means that FinalizableReferenceQueueTest
      // doesn't pick up the wrong version of the Finalizer class.
      return new URLClassLoader(new URL[] {base}, null);
    }

    }

    /** Creates a class loader with the given base URL as its classpath. */
    URLClassLoader newLoader(URL base) {
      // We use the bootstrap class loader as the parent because Finalizer by design uses
      // only standard Java classes. That also means that FinalizableReferenceQueueTest
      // doesn't pick up the wrong version of the Finalizer class.
      return new URLClassLoader(new URL[] {base}, null);
    }

@ElementTypesAreNonnullByDefault
abstract class AbstractMapBasedMultimap<K extends @Nullable Object, V extends @Nullable Object>
    extends AbstractMultimap<K, V> implements Serializable {
  /*
   * Here's an outline of the overall design.
   *
   * The map variable contains the collection of values associated with each
   * key. When a key-value pair is added to a multimap that didn't previously
   * contain any values for that key, a new collection generated by

 *
 * <ul>
 *   <li>a → 1
 *   <li>a → 2
 *   <li>b → 3
 * </ul>
 *
 * <p><b>Important:</b> although the first interpretation resembles how most multimaps are
 * <i>implemented</i>, the design of the {@code Multimap} API is based on the <i>second</i> form.
 * So, using the multimap shown above as an example, the {@link #size} is {@code 3}, not {@code 2},

  /*
   * This is an implementation of ImmutableMap optimized especially for Android, which does not like
   * objects per entry.  Instead we use an open-addressed hash table.  This design is basically
   * equivalent to RegularImmutableSet, save that instead of having a hash table containing the
   * elements directly and null for empty positions, we store indices of the keys in the hash table,

 * interpretation of the edge value as its multiplicity.)
 *
 * <h3>Building a {@code ValueGraph}</h3>
 *
 * <p>The implementation classes that {@code common.graph} provides are not public, by design. To
 * create an instance of one of the built-in implementations of {@code ValueGraph}, use the {@link
 * ValueGraphBuilder} class:
 *
 * <pre>{@code

  //    Imagine:
  //    guard.lock();
  //    try { /* monitor locked and guard satisfied here */ }
  //    finally { guard.unlock(); }
  // Here are Justin's design notes about this:
  //
  // This idea has come up from time to time, and I think one of my
  // earlier versions of Monitor even did something like this. I ended
  // up strongly favoring the current interface.
  //

   * Format</a> ({@code crw} files), a widely-used "raw image" format for cameras. It is found in
   * {@code /etc/mime.types}, e.g. in <a href=
   * "http://anonscm.debian.org/gitweb/?p=collab-maint/mime-support.git;a=blob;f=mime.types;hb=HEAD"
   * >Debian 3.48-1</a>.
   *
   * @since 15.0
   */
  public static final MediaType CRW = createConstant(IMAGE_TYPE, "x-canon-crw");

 * extensions with parallel edges. If you need parallel edges, use {@link Network}.
 *
 * <h3>Building a {@code Graph}</h3>
 *
 * <p>The implementation classes that {@code common.graph} provides are not public, by design. To
 * create an instance of one of the built-in implementations of {@code Graph}, use the {@link
 * GraphBuilder} class:
 *
 * <pre>{@code
 * MutableGraph<Integer> graph = GraphBuilder.undirected().build();
 * }</pre>

@ElementTypesAreNonnullByDefault
abstract class AbstractMapBasedMultimap<K extends @Nullable Object, V extends @Nullable Object>
    extends AbstractMultimap<K, V> implements Serializable {
  /*
   * Here's an outline of the overall design.
   *
   * The map variable contains the collection of values associated with each
   * key. When a key-value pair is added to a multimap that didn't previously
   * contain any values for that key, a new collection generated by