String part2 = null;

        if (index < 0) {
            part1 = version;
        } else {
            part1 = version.substring(0, index);
            part2 = version.substring(index + 1);
        }

        if (part2 != null) {
            if (part2.length() == 1 || !part2.startsWith("0")) {
                buildNumber = tryParseInt(part2);
                if (buildNumber == null) {

     * if output directories are desired on the class-path or module-path.
     * This method can be invoked at most once.
     *
     * @param main the main output directory, or {@code null} if none
     * @param test the test output directory, or {@code null} if none
     * @param cache cache of module information about each dependency
     * @throws IOException if an error occurred while reading module information

                    }
                } else if (request.isForceUpdate()) {
                    update = true;
                } else if (localCopyLastModified != null && !policy.checkOutOfDate(localCopyLastModified)) {
                    update = false;

                    if (getLogger().isDebugEnabled()) {
                        getLogger()

        int result = groupId.compareTo(a.getGroupId());
        if (result == 0) {
            result = artifactId.compareTo(a.getArtifactId());
            if (result == 0) {
                result = type.compareTo(a.getType());
                if (result == 0) {
                    if (classifier == null) {
                        if (a.getClassifier() != null) {
                            result = 1;

            boolean isBlankParentUrl = true;

            if (parentUrl != null) {
                for (int i = 0; i < parentUrl.length(); i++) {
                    if (!Character.isWhitespace(parentUrl.charAt(i))) {
                        isBlankParentUrl = false;
                    }
                }
            }

            Model model;

            // TODO hack: don't rebuild model if it was already loaded during reactor resolution
            final WorkspaceReader workspace = session.getWorkspaceReader();
            if (workspace instanceof MavenWorkspaceReader) {
                model = ((MavenWorkspaceReader) workspace).findModel(pomArtifact);
                if (model != null) {
                    return model;
                }

        this.projectSelector = new ProjectSelector(); // if necessary switch to DI
    }

    @Override
    public Result<ProjectDependencyGraph> build(MavenSession session) {
        try {
            Result<ProjectDependencyGraph> result = sessionDependencyGraph(session);

            if (result == null) {
                final List<MavenProject> projects = getProjectsForMavenReactor(session);

    }

    /**
     * Extracts the extension descriptor (if any) from the specified JAR file.
     *
     * @param extensionJar The JAR file or directory to extract the descriptor from, must not be {@code null}.
     * @return The extracted descriptor or {@code null} if no descriptor was found.
     * @throws IOException If the descriptor is present but could not be parsed.
     */

     */
    @Nonnull
    <T> Optional<T> lookupOptional(Class<T> type);

    /**
     * Performs a lookup for optional typed component.
     *
     * @param type The component type.
     * @param name The component name.
     * @return Optional carrying component or empty optional if no such component.
     * @param <T> The component type.

            repository.setUrl(mirror.getUrl());

            if (mirror.getLayout() != null && !mirror.getLayout().isEmpty()) {
                repository.setLayout(original.getLayout());
            }

            repository.setBlocked(mirror.isBlocked());
        }
    }

    private void injectProxy(ProxySelector selector, List<ArtifactRepository> repositories) {
        if (repositories != null && selector != null) {