001    // Copyright 2005 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.tapestry.annotations;
016    
017    import org.apache.hivemind.Location;
018    import org.apache.tapestry.enhance.EnhancementOperation;
019    import org.apache.tapestry.spec.IComponentSpecification;
020    
021    /**
022     * Defines workers that perform annotation enhancements at the class level.
023     * 
024     * @author Howard Lewis Ship
025     * @since 4.0
026     */
027    public interface ClassAnnotationEnhancementWorker
028    {
029        /**
030         * Performs a particular enhancement based on a registered annotation. Exception reporting is
031         * the responsibility of the caller.
032         * 
033         * @param op
034         *            the enhancement operaration
035         * @param spec
036         *            the specification of the component for which a class is being enhanced
037         * @param baseClass
038         *            the class containing the annotation
039         * @param location
040         *            the location associated with the annotation
041         */
042    
043        void performEnhancement(EnhancementOperation op, IComponentSpecification spec,
044                Class baseClass, Location location);
045    
046    }