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 }