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
015package org.apache.tapestry5.internal.plastic;
016
017public 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}