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    public class PlasticClassLoader extends ClassLoader
018    {
019        private final ClassLoaderDelegate delegate;
020    
021        public PlasticClassLoader(ClassLoader parent, ClassLoaderDelegate delegate)
022        {
023            super(parent);
024    
025            this.delegate = delegate;
026        }
027    
028        @Override
029        protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException
030        {
031            Class<?> loadedClass = findLoadedClass(name);
032    
033            if (loadedClass != null)
034                return loadedClass;
035    
036            if (delegate.shouldInterceptClassLoading(name))
037            {
038                Class<?> c = delegate.loadAndTransformClass(name);
039    
040                if (resolve)
041                    resolveClass(c);
042    
043                return c;
044            } else
045            {
046                return super.loadClass(name, resolve);
047            }
048        }
049    
050        public synchronized Class<?> defineClassWithBytecode(String className, byte[] bytecode)
051        {
052            return defineClass(className, bytecode, 0, bytecode.length);
053        }
054    }