001    // Copyright 2006 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.services;
016    
017    import org.apache.tapestry.model.MutableComponentModel;
018    
019    /**
020     * Interface for a set of objects that can perform component class transformations. Implementations should be
021     * multithreaded, ideally they should be stateless (all necessary state can be stored in the {@link
022     * org.apache.tapestry.services.ClassTransformation}).
023     */
024    public interface ComponentClassTransformWorker
025    {
026        /**
027         * Invoked to perform a transformation on an as-yet unloaded component class, represented by the {@link
028         * ClassTransformation} instance. In some cases, the worker may make changes to the component model -- for example,
029         * a worker that deals with parameters may update the model to reflect those parameters.
030         */
031        void transform(ClassTransformation transformation, MutableComponentModel model);
032    }