public static Equivalence<Object> identity() {
    return Identity.INSTANCE;
  }

  static final class Equals extends Equivalence<Object> implements Serializable {

    static final Equals INSTANCE = new Equals();

    @Override
    protected boolean doEquivalent(Object a, Object b) {
      return a.equals(b);
    }

    @Override
    protected int doHash(Object o) {
      return o.hashCode();
    }

    }

    @Override
    public boolean equals(@CheckForNull Object other) {
      if (!(other instanceof ParameterizedType)) {
        return false;
      }
      ParameterizedType that = (ParameterizedType) other;
      return getRawType().equals(that.getRawType())
          && Objects.equal(getOwnerType(), that.getOwnerType())
          && Arrays.equals(getActualTypeArguments(), that.getActualTypeArguments());
    }

    @Secured({ ROLE })
    public HtmlResponse upgradeFrom(final UpgradeForm form) {
        validate(form, messages -> {}, this::asIndexHtml);
        verifyToken(this::asIndexHtml);

        if (VERSION_13_0.equals(form.targetVersion)) {
            try {
                upgradeFrom13_0();
                upgradeFrom13_1();
                upgradeFrom13_2();
                upgradeFrom13_3();
                upgradeFrom13_4();

                    && extension.equals(that.extension)
                    && version.equals(that.version)
                    && context.equals(that.context)
                    && localRepo.equals(that.localRepo)
                    && Objects.equals(workspace, that.workspace)
                    && repositories.equals(that.repositories);
        }

        @Override
        public int hashCode() {

     */
    private static boolean isTestArtifact(Artifact artifact) {
        return ("test-jar".equals(artifact.getProperty("type", "")))
                || ("jar".equals(artifact.getExtension()) && "tests".equals(artifact.getClassifier()));
    }

    private File findInProjectLocalRepository(Artifact artifact) {
        Path target = getArtifactPath(artifact);

            configProps.put(JDK_HTTP_TRANSPORTER_PRIORITY_KEY, RESOLVER_MAX_PRIORITY);
        } else if (MAVEN_RESOLVER_TRANSPORT_APACHE.equals(transport)
                || MAVEN_RESOLVER_TRANSPORT_NATIVE.equals(transport)) {
            if (MAVEN_RESOLVER_TRANSPORT_NATIVE.equals(transport)) {
                logger.warn(
                        "Transport name '{}' is DEPRECATED/RENAMED, use '{}' instead",

   * the first are ignored.
   */
  public static <E> ImmutableSet<E> of(E e1, E e2) {
    return construct(2, e1, e2);
  }

  /**
   * Returns an immutable set containing the given elements, minus duplicates, in the order each was
   * first specified. That is, if multiple elements are {@linkplain Object#equals equal}, all except
   * the first are ignored.
   */

          if (previousKeyIndex == BYTE_MASK) { // -1 signed becomes 255 unsigned
            hashTable[h] = (byte) outKeyIndex;
            break;
          } else if (key.equals(alternatingKeysAndValues[previousKeyIndex])) {
            duplicateKey =
                new Builder.DuplicateKey(
                    key, value, requireNonNull(alternatingKeysAndValues[previousKeyIndex ^ 1]));

        Model model = project.getModel().getDelegate();
        String packaging = model.getPackaging();
        String originalPackaging = project.getOriginalModel().getPackaging();
        if (POM_PACKAGING.equals(packaging) && !BOM_PACKAGING.equals(originalPackaging)) {
            return buildPom(session, project, src);
        } else {
            return buildNonPom(session, project, src);
        }
    }

        List<RemoteRepository> newRepositories =
                Collections.singletonList(ArtifactDescriptorUtils.toRemoteRepository(repository));

        if (ProjectBuildingRequest.RepositoryMerging.REQUEST_DOMINANT.equals(repositoryMerging)) {
            repositories = remoteRepositoryManager.aggregateRepositories(session, repositories, newRepositories, true);
        } else {
            pomRepositories =