/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.aries.proxy.impl.weaving;
import static org.objectweb.asm.Opcodes.ACC_ANNOTATION;
import static org.objectweb.asm.Opcodes.ACC_ENUM;
import static org.objectweb.asm.Opcodes.ACC_INTERFACE;
import org.apache.aries.proxy.impl.common.AbstractWovenProxyAdapter;
import org.apache.aries.proxy.impl.common.OSGiFriendlyClassWriter;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
/**
* This class is used to weave the bytes of a class into a proxyable class
*/
public final class WovenProxyGenerator
{
public static final byte[] getWovenProxy(byte[] original, String className, ClassLoader loader){
ClassReader cReader = new ClassReader(original);
//Don't weave interfaces, enums or annotations
if((cReader.getAccess() & (ACC_INTERFACE | ACC_ANNOTATION | ACC_ENUM)) != 0)
return null;
//If we are Java 1.6 + compiled then we need to compute stack frames, otherwise
//maxs are fine (and faster)
ClassWriter cWriter = new OSGiFriendlyClassWriter(cReader, AbstractWovenProxyAdapter.IS_AT_LEAST_JAVA_6 ?
ClassWriter.COMPUTE_FRAMES : ClassWriter.COMPUTE_MAXS, loader);
//Wrap our outer layer to add the original SerialVersionUID if it was previously being defaulted
ClassVisitor weavingAdapter = new SyntheticSerialVerUIDAdder(
new WovenProxyAdapter(cWriter, className, loader));
// If we are Java 1.6 + then we need to skip frames as they will be recomputed
cReader.accept(weavingAdapter, AbstractWovenProxyAdapter.IS_AT_LEAST_JAVA_6 ? ClassReader.SKIP_FRAMES : 0);
return cWriter.toByteArray();
}
}