    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
    015    package org.apache.tapestry5.services.meta;
    016
    017    import org.apache.tapestry5.ioc.annotations.UsesMappedConfiguration;
    018    import 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)
    029    public 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    }