    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005// http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012
    013package org.apache.tapestry5;
    014
    015/**
    016 * Encapsulates a bit of information that can be represented as a boolean.
    017 *
    018 * @since 5.4
    019 */
    020public interface BooleanHook
    021{
    022    /** Evaluates the hook and returns its value. */
    023    boolean checkHook();
    024}