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()

        if (g == 0) {
            int a = compareStrings(md.artifactId, vmd.artifactId);
            if (a == 0) {
                if (compareVersion) {
                    int v = compareStrings(md.version, vmd.version);
                    if (v == 0) {
                        if (compareScope) {
                            String s1 = ArtifactScopeEnum.checkScope(md.artifactScope)

        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;
                    }
                }
            }

                if (isCompatible(request, ver)) {
                    version = ver;
                    repo = versions.versions.get(version);
                    break;
                }
            }

            if (version == null) {
                for (Version v : snapshots) {
                    String ver = v.toString();
                    if (isCompatible(request, ver)) {

        if (policy == null) {
            throw new GraphConflictResolutionException("no GraphConflictResolutionPolicy injected");
        }

        if (graph == null) {
            return null;
        }

        final MetadataGraphVertex entry = graph.getEntry();
        if (entry == null) {
            return null;
        }

        if (graph.isEmpty()) {

            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);