public interface Credentials {

    /**
     * 
     * @param type
     * @return instance for type, null if the type cannot be unwrapped
     */
    <T extends Credentials> T unwrap ( Class<T> type );


    /**
     * @return the domain the user account is in
     */
    String getUserDomain ();


    /**
     * @return whether these are anonymous credentials
     */
    boolean isAnonymous ();

    @Override
    protected Pattern getEncodingPattern() {
        return xmlEncodingPattern;
    }

    @Override
    protected Pattern getTagPattern() {
        return xmlTagPattern;
    }

    public Pattern getXmlEncodingPattern() {
        return xmlEncodingPattern;
    }

    public void setXmlEncodingPattern(final Pattern metaCharsetPattern) {

    return delegate.cancel(mayInterruptIfRunning);
  }

  @Override
  public boolean isCancelled() {
    return delegate.isCancelled();
  }

  @Override
  public boolean isDone() {
    return delegate.isDone();
  }

  @Override
  @ParametricNullness
  public V get() throws InterruptedException, ExecutionException {
    return delegate.get();
  }

  @Override

    //                                                                             =======
    @Override
    public ElevateWordToLabelDbm asDBMeta() {
        return ElevateWordToLabelDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "elevate_word_to_label";
    }

    // ===================================================================================

    //                                                                             =======
    @Override
    public GroupDbm asDBMeta() {
        return GroupDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "group";
    }

    // ===================================================================================

  @Override
  public int read(char[] cbuf, int off, int len) throws IOException {
    checkNotNull(cbuf);
    if (current == null) {
      return -1;
    }
    int result = current.read(cbuf, off, len);
    if (result == -1) {
      advance();
      return read(cbuf, off, len);
    }
    return result;
  }

  @Override
  public long skip(long n) throws IOException {
    Preconditions.checkArgument(n >= 0, "n is negative");

      MapMakerInternalMap<K, V, ? extends InternalEntry<K, V, ?>, ? extends Segment<K, V, ?, ?>>
          makeMap(MapMaker maker) {
    return MapMakerInternalMap.create(maker);
  }

  private static MapMaker createMapMaker() {
    MapMaker maker = new MapMaker();
    maker.useCustomMap = true;
    return maker;
  }

  // constructor tests

  public void testDefaults() {

      MapMakerInternalMap<K, V, ? extends InternalEntry<K, V, ?>, ? extends Segment<K, V, ?, ?>>
          makeMap(MapMaker maker) {
    return MapMakerInternalMap.create(maker);
  }

  private static MapMaker createMapMaker() {
    MapMaker maker = new MapMaker();
    maker.useCustomMap = true;
    return maker;
  }

  // constructor tests

  public void testDefaults() {

    /**
     * @return the errorData
     */
    public final byte[] getErrorData () {
        return this.errorData;
    }


    /**
     * @return the errorContextCount
     */
    public final byte getErrorContextCount () {
        return this.errorContextCount;
    }


    /**
     * @return the headerStart
     */
    public final int getHeaderStart () {
        return this.headerStart;

    public String[] getInputs() {
        return inputs;
    }

    public String getInputsValue() {
        if (inputs == null) {
            return StringUtil.EMPTY;
        }
        return String.join("\n", inputs);
    }

    public String[] getOutputs() {
        return outputs;
    }

    public String getOutputsValue() {
        if (outputs == null) {
            return StringUtil.EMPTY;
        }