001    // Copyright 2011 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.internal.plastic;
016    
017    /**
018     * Externalizes the logic for defining which classes will be loaded (and possibly transformed) by the class loader, and
019     * which will be loaded by the parent class loader.
020     */
021    public interface ClassLoaderDelegate
022    {
023        /**
024         * Identifies which classes are to be loaded.
025         * 
026         * @param className
027         *            fully qualified class name
028         * @return true if the class should be intercepted, false to let parent class loader load class
029         */
030        boolean shouldInterceptClassLoading(String className);
031    
032        /**
033         * Load the class, transforming it as necessary.
034         * 
035         * @param className
036         *            binary class name
037         * @return loaded and (if not an inner class) transformed class
038         * @throws ClassNotFoundException
039         */
040        Class<?> loadAndTransformClass(String className) throws ClassNotFoundException;
041    }