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 java.lang.reflect.Method;
018    
019    import org.apache.hivemind.Location;
020    import org.apache.tapestry.enhance.EnhancementOperation;
021    import org.apache.tapestry.spec.IComponentSpecification;
022    
023    /**
024     * Defines workers that perform annotation enhancements at the method level.
025     * 
026     * @author Howard Lewis Ship
027     * @since 4.0
028     */
029    public interface MethodAnnotationEnhancementWorker
030    {
031        /**
032         * Performs a particular enhancement based on a registered annotation. Exception reporting is
033         * the responsibility of the caller.
034         * 
035         * @param op
036         *            the enhancement operaration
037         * @param spec
038         *            the specification of the component for which a class is being enhanced
039         * @param method
040         *            the method to which the annotation is attached. The annotation
041         *            may be obtained from the method.
042         * @param location TODO
043         */
044    
045        void performEnhancement(EnhancementOperation op, IComponentSpecification spec,
046                Method method, Location location);
047    }