/* | |
* 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.OSGiFriendlyClassVisitor; | |
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, 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) | |
int computeVal = AbstractWovenProxyAdapter.IS_AT_LEAST_JAVA_6 ? | |
ClassWriter.COMPUTE_FRAMES : ClassWriter.COMPUTE_MAXS; | |
ClassWriter cWriter = new OSGiFriendlyClassWriter(cReader, computeVal, loader); | |
ClassVisitor cv = new OSGiFriendlyClassVisitor(cWriter, computeVal ); | |
//Wrap our outer layer to add the original SerialVersionUID if it was previously being defaulted | |
ClassVisitor weavingAdapter = new SyntheticSerialVerUIDAdder( | |
new WovenProxyAdapter(cv, cReader.getClassName(), 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(); | |
} | |
} |