    001// Copyright 2012 The Apache Software Foundation
    002//
    003// Licensed under the Apache License, Version 2.0 (the "License");
    004// you may not use this file except in compliance with the License.
    005// You may obtain a copy of the License at
    006//
    007//     http://www.apache.org/licenses/LICENSE-2.0
    008//
    009// Unless required by applicable law or agreed to in writing, software
    010// distributed under the License is distributed on an "AS IS" BASIS,
    011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012// See the License for the specific language governing permissions and
    013// limitations under the License.
    014
    015package org.apache.tapestry5.services.compatibility;
    016
    017import org.apache.tapestry5.ioc.annotations.UsesMappedConfiguration;
    018
    019/**
    020 * Used globally to track what compatibility traits are enabled.  By default, in Tapestry 5.4,
    021 * all traits are enabled unless explicitly disabled. This behavior may change in Tapestry 5.5.
    022 * <p/>
    023 * The configuration allows traits to be explicitly enabled or disabled.
    024 *
    025 * @since 5.4
    026 */
    027@UsesMappedConfiguration(key = Trait.class, value = Boolean.class)
    028public interface Compatibility
    029{
    030    /**
    031     * Returns true if the indicated compatibility trait is enabled.
    032     *
    033     * @param trait
    034     * @return true if enabled, false otherwise
    035     */
    036    boolean enabled(Trait trait);
    037}