    001// Copyright 2010 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.meta;
    016
    017import org.apache.tapestry5.ioc.annotations.UsesMappedConfiguration;
    018import org.apache.tapestry5.services.transform.ComponentClassTransformWorker2;
    019
    020/**
    021 * Service that makes it easy to identify a class annotation and use its presence, or the value of an attribute,
    022 * to set a meta-data key. The configuration map class annotation types to corresponding extractors who will be invoked
    023 * when the annotation is present. Most commonly, a {@link FixedExtractor} is used to set a fixed value to a fixed key,
    024 * triggered by the presence of the corresponding annotation.
    025 *
    026 * @since 5.2.0
    027 */
    028@UsesMappedConfiguration(key = Class.class, value = MetaDataExtractor.class)
    029public interface MetaWorker
    030{
    031    /**
    032     * Returns the worker that performs transformations (in 5.2, MetaWorker implemented ComponentClassTransformWorker).
    033     *
    034     * @return worker that implements the meta data analysis
    035     */
    036    ComponentClassTransformWorker2 getWorker();
    037}