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}