private static final String FAMILY_DOS = "dos";

    /**
     * OS family that can be tested for. {@value}
     */
    private static final String FAMILY_MAC = "mac";

    /**
     * OS family that can be tested for. {@value}
     */
    private static final String FAMILY_TANDEM = "tandem";

    /**
     * OS family that can be tested for. {@value}
     */
    private static final String FAMILY_UNIX = "unix";

    /**

            return false;
        }

        boolean active = ensureAtLeastOneNonNull(os);

        String actualOsName = context.getSystemProperties().get("os.name").toLowerCase(Locale.ENGLISH);
        String actualOsArch = context.getSystemProperties().get("os.arch").toLowerCase(Locale.ENGLISH);
        String actualOsVersion = context.getSystemProperties().get("os.version").toLowerCase(Locale.ENGLISH);

            s = new File(new File(basedir, s).toURI().normalize()).getAbsolutePath();
        }

        return s;
    }

    private String stripBasedirToken(String s) {
        if (s != null) {
            String basedirExpr = null;
            for (String expression : BASEDIR_EXPRESSIONS) {
                if (s.startsWith(expression)) {
                    basedirExpr = expression;
                    break;

    }

    private static int getRelationOrder(String value, RangeValue rangeValue, boolean isLeft) {
        if (rangeValue.value.isEmpty()) {
            return isLeft ? 1 : -1;
        }

        value = FILTER_1.matcher(value).replaceAll("");

        List<String> valueTokens = new ArrayList<>(Arrays.asList(FILTER_2.split(value)));

 */
final class PluginsMetadata extends MavenMetadata {
    static final class PluginInfo {
        final String groupId;

        private final String artifactId;

        private final String goalPrefix;

        private final String name;

        PluginInfo(String groupId, String artifactId, String goalPrefix, String name) {
            this.groupId = groupId;
            this.artifactId = artifactId;

        return groupId + ":" + artifactId;
    }

    public static String key(Artifact artifact) {
        return key(artifact.getGroupId(), artifact.getArtifactId(), artifact.getVersion());
    }

    public static String key(String groupId, String artifactId, String version) {
        notBlank(groupId, "groupId can neither be null, empty nor blank");

     */
    @Deprecated
    public DuplicateProjectException(String message, Exception e) {
        super(message, e);
        this.projectId = null;
        this.existingProjectFile = null;
        this.conflictingProjectFile = null;
    }

    public DuplicateProjectException(
            String projectId, File existingProjectFile, File conflictingProjectFile, String message) {

        assertEquals(expectedNode, resolvedNode, "Resolution node");
    }

    protected Artifact createArtifact(String id, String version) throws InvalidVersionSpecificationException {
        return createArtifact(id, version, Artifact.SCOPE_COMPILE);
    }

    protected Artifact createArtifact(String id, String version, String scope)
            throws InvalidVersionSpecificationException {

            }
        }
        return null;
    }

    private boolean isProjectContext(String context) {
        return context != null && context.startsWith("project");
    }

    private static boolean isAny(String str) {
        return "*".equals(str);
    }

    private static boolean matches(String pattern, String str) {
        if (isAny(pattern)) {
            return true;

    public boolean isSnapshot(String version) {
        return checkSnapshot(version);
    }

    public static boolean checkSnapshot(String version) {
        return version.endsWith(SNAPSHOT) || SNAPSHOT_TIMESTAMP.matcher(version).matches();
    }

    @Override
    public VersionConstraint parseVersionConstraint(String constraint) {
        requireNonNull(constraint, "constraint");