/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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 net.sf.cglib.transform.impl;
import java.lang.reflect.Method;
import net.sf.cglib.core.CodeEmitter;
import net.sf.cglib.core.Constants;
import net.sf.cglib.core.MethodInfo;
import net.sf.cglib.core.ReflectUtils;
import net.sf.cglib.core.Signature;
import net.sf.cglib.transform.ClassEmitterTransformer;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.Type;
/**
* @author Mark Hobson
*/
public class AddInitTransformer extends ClassEmitterTransformer {
private MethodInfo info;
public AddInitTransformer(Method method) {
info = ReflectUtils.getMethodInfo(method);
Type[] types = info.getSignature().getArgumentTypes();
if (types.length != 1 ||
!types[0].equals(Constants.TYPE_OBJECT) ||
!info.getSignature().getReturnType().equals(Type.VOID_TYPE)) {
throw new IllegalArgumentException(method + " illegal signature");
}
}
public CodeEmitter begin_method(int access, Signature sig, Type[] exceptions) {
final CodeEmitter emitter = super.begin_method(access, sig, exceptions);
if (sig.getName().equals(Constants.CONSTRUCTOR_NAME)) {
return new CodeEmitter(emitter) {
public void visitInsn(int opcode) {
if (opcode == Constants.RETURN) {
load_this();
invoke(info);
}
super.visitInsn(opcode);
}
};
}
return emitter;
}
}