/*
* 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.synthesizer;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;
/**
* The Synthesizer class can be run from a java command with arguments
* of paths to class files that should be modified to have the synthetic
* attribute added.
*
*/
public class Synthesizer
{
/**
* This is the main method for running the Synthesizer
*
* @param args - String[] of file paths to class files
* @throws Exception
*/
public static void main(String[] args) throws Exception
{
//add the synthetic modifier for each of the supplied args
for (String arg : args) {
FileInputStream classInStream = null;
ClassWriter writer = null;
try {
//read in the class
classInStream = new FileInputStream(arg);
ClassReader reader = new ClassReader(classInStream);
//make a ClassWriter constructed with the reader for speed
//since we are mostly just copying
//we just need to override the visit method so we can add
//the synthetic modifier, otherwise we use the methods in
//a standard writer
writer = new ClassWriter(reader, 0) {
@Override
public void visit(int version, int access, String name, String signature,
String superName, String[] interfaces)
{
super.visit(version, access | Opcodes.ACC_SYNTHETIC, name, signature, superName,
interfaces);
}
};
//call accept on the reader to start the visits
//using the writer we created as the visitor
reader.accept(writer, 0);
} finally {
//close the InputStream if it is hanging around
if (classInStream != null) classInStream.close();
}
FileOutputStream classOutStream = null;
try {
//write out the new bytes of the class file
classOutStream = new FileOutputStream(arg);
if (writer != null) classOutStream.write(writer.toByteArray());
} finally {
//close the OutputStream if it is still around
if (classOutStream != null) classOutStream.close();
}
}
}
}