if (auth != null) {
            return;
        }
        auth = a;
    }

    /**
     * Gets the default NTLM authenticator.
     * @return the default authentication credentials provider
     */
    public static NtlmAuthenticator getDefault() {
        return auth;
    }

    /**
     * Gets the URL that is requesting authentication.
     * @return the URL requiring authentication
     */

    return newTypeVariableImpl(
        declaration, name, (bounds.length == 0) ? new Type[] {Object.class} : bounds);
  }

  /** Returns a new {@link WildcardType} with {@code upperBound}. */
  @VisibleForTesting
  static WildcardType subtypeOf(Type upperBound) {
    return new WildcardTypeImpl(new Type[0], new Type[] {upperBound});
  }

  }

  /**
   * Override to return a chaining listenableFuture that returns the result of getSuccessfulResult()
   * when inputFuture returns VALID_INPUT_DATA, and sets the exception to EXCEPTION in all other
   * cases.
   */
  protected abstract ListenableFuture<T> buildChainingFuture(ListenableFuture<Integer> inputFuture);

  /**
   * Override to return the result when VALID_INPUT_DATA is passed in to the chaining

    protected HttpServletRequest request;

    /**
     * Returns an empty OptionalThing for login manager since API actions
     * use token-based authentication instead of traditional session-based login.
     *
     * @return empty OptionalThing indicating no login manager is used
     */
    @Override
    protected OptionalThing<LoginManager> myLoginManager() {
        return OptionalThing.empty();
    }

    /**

     * @return {@code true} to visit siblings nodes of this node as well, {@code false} to skip siblings
     */
    boolean accept(@Nonnull NodeVisitor visitor);

    /**
     * Returns a new tree starting at this node, filtering the children.
     * Note that this node will not be filtered and only the children
     * and its descendant will be checked.
     *
     * @param filter the filter to apply
     * @return a new filtered graph

                buf.append(c);
            }
        }
        return buf.toString().trim();
    }

    /**
     * Parses the XML content from the provided {@link AccessResultData} and returns a map of the data.
     *
     * @param accessResultData the data containing the XML content to be parsed
     * @return a map containing the parsed data from the XML content

        this.value = value;
    }

    /**
     * Returns the property name.
     *
     * @return Property name
     */
    public String getPropertyName() {
        return propertyName;
    }

    /**
     * Returns the value.
     *
     * @return Value
     */
    public Object getValue() {
        return value;
    }

        this.fieldName = fieldName;
    }

    /**
     * Returns the target class.
     *
     * @return Target class
     */
    public Class<?> getTargetClass() {
        return targetClass;
    }

    /**
     * Returns the field name.
     *
     * @return Field name
     */
    public String getFieldName() {
        return fieldName;
    }

        this.methodName = methodName;
    }

    /**
     * Returns the target class.
     *
     * @return Target class
     */
    public Class<?> getTargetClass() {
        return targetClass;
    }

    /**
     * Returns the method name.
     *
     * @return Method name
     */
    public String getMethodName() {
        return methodName;
    }

        this.fieldName = fieldName;
    }

    /**
     * Returns the target class.
     *
     * @return Target class
     */
    public Class<?> getTargetClass() {
        return targetClass;
    }

    /**
     * Returns the field name.
     *
     * @return Field name
     */
    public String getFieldName() {
        return fieldName;
    }