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

        return groupId + ":" + artifactId + ":" + version;
    }

    private static void notBlank(String str, String message) {

        assertEquals("PrunedTag [tag=a, id=null, css=test, attrName=null, attrValue=null]", tags[0].toString());

        tags = PrunedTag.parse("a[target=_blank]");
        assertEquals(1, tags.length);
        assertEquals("PrunedTag [tag=a, id=null, css=null, attrName=target, attrValue=_blank]", tags[0].toString());

        tags = PrunedTag.parse("a.link,div#123");
        assertEquals(2, tags.length);

    }


    /**
     * 
     * @return whether the SID is blank (all sub-authorities zero)
     */
    public boolean isBlank () {
        boolean blank = true;
        for ( int sub : this.sub_authority )
            blank = blank && ( sub == 0 );
        return blank;
    }


    /**
     * 
     * @return domain SID
     */
    @Override

                         * blank password initializes signing.
                         */
                        if (transport.isSignatureSetupRequired( auth )) {
                            if( auth.hashesExternal && NtlmPasswordAuthentication.DEFAULT_PASSWORD != NtlmPasswordAuthentication.BLANK ) {
                                /* preauthentication
                                 */

        return false;
    }

    public ArtifactRepository getRepository() {
        return null;
    }

    public void setRepository(ArtifactRepository remoteRepository) {
        // intentionally blank
    }

 *
 * @author Jon Noack
 */
@GwtIncompatible
@ElementTypesAreNonnullByDefault
final class CompactHashing {
  private CompactHashing() {}

  /** Indicates blank table entries. */
  static final byte UNSET = 0;

  /** Number of bits used to store the numbers of hash table bits (max 30). */
  private static final int HASH_TABLE_BITS_MAX_BITS = 5;

 *
 * @author Jon Noack
 */
@GwtIncompatible
@ElementTypesAreNonnullByDefault
final class CompactHashing {
  private CompactHashing() {}

  /** Indicates blank table entries. */
  static final byte UNSET = 0;

  /** Number of bits used to store the numbers of hash table bits (max 30). */
  private static final int HASH_TABLE_BITS_MAX_BITS = 5;

        final String fileName = artifact.getFileName();
        final String url = artifact.getUrl();
        if (StringUtil.isBlank(url)) {
            throw new PluginException("url is blank: " + artifact.getName());
        }
        if (url.startsWith("http:") || url.startsWith("https:")) {
            try (final CurlResponse response = createCurlRequest(url).execute()) {

            System.arraycopy( e8, 0, e, i * 8, 8 );
        }
    }

    static String DEFAULT_DOMAIN;
    static String DEFAULT_USERNAME;
    static String DEFAULT_PASSWORD;
    static final String BLANK = "";

    public static final NtlmPasswordAuthentication ANONYMOUS = new NtlmPasswordAuthentication("", "", "");

    static void initDefaults() {
        if (DEFAULT_DOMAIN != null) return;

        attrExpiration = sizeExpiration =
                System.currentTimeMillis() + attrExpirationPeriod;
    }

    private SmbComBlankResponse blank_resp() {
        if( blank_resp == null ) {
            blank_resp = new SmbComBlankResponse();
        }
        return blank_resp;
    }
    void resolveDfs(ServerMessageBlock request) throws SmbException {
        if (request instanceof SmbComClose)
            return;