@Override
public boolean transform(
ClassLoader loader,
String className,
Class<?> classBeingRedefined,
ProtectionDomain protectionDomain,
ClassFile file)
throws IllegalClassFormatException, BadBytecode {
/**
* Hack up the proxy factory so it stores the proxy ClassFile. We need this to regenerate
* proxies.
*/
if (file.getName().equals("org.jboss.weld.bean.proxy.ProxyFactory")) {
for (final MethodInfo method : (List<MethodInfo>) file.getMethods()) {
if (method.getName().equals("createProxyClass")) {
final MethodInvokationManipulator methodInvokationManipulator =
new MethodInvokationManipulator();
methodInvokationManipulator.replaceVirtualMethodInvokationWithStatic(
ClassLoader.class.getName(),
WeldProxyClassLoadingDelegate.class.getName(),
"loadClass",
"(Ljava/lang/String;)Ljava/lang/Class;",
"(Ljava/lang/ClassLoader;Ljava/lang/String;)Ljava/lang/Class;",
loader);
methodInvokationManipulator.replaceVirtualMethodInvokationWithStatic(
"org.jboss.weld.util.bytecode.ClassFileUtils",
WeldProxyClassLoadingDelegate.class.getName(),
"toClass",
"(Ljavassist/bytecode/ClassFile;Ljava/lang/ClassLoader;Ljava/security/ProtectionDomain;)Ljava/lang/Class;",
"(Ljavassist/bytecode/ClassFile;Ljava/lang/ClassLoader;Ljava/security/ProtectionDomain;)Ljava/lang/Class;",
loader);
HashSet<MethodInfo> modifiedMethods = new HashSet<MethodInfo>();
methodInvokationManipulator.transformClass(file, loader, true, modifiedMethods);
for (MethodInfo m : modifiedMethods) {
m.rebuildStackMap(ClassPool.getDefault());
}
return true;
} else if (method.getName().equals("<init>")) {
Integer beanArgument = null;
int count = 0;
for (final String paramType :
DescriptorUtils.descriptorStringToParameterArray(method.getDescriptor())) {
if (paramType.equals("javax/enterprise/inject/spi/Bean")) {
beanArgument = count;
break;
} else if (paramType.equals("D") || paramType.equals("J")) {
count += 2;
} else {
count++;
}
}
if (beanArgument == null) {
log.error(
"Constructor org.jboss.weld.bean.proxy.ProxyFactory.<init>"
+ method.getDescriptor()
+ " does not have a bean parameter, proxies produced by this factory will not be reloadable");
continue;
}
// similar to other tracked instances
// but we need a strong ref
Bytecode code = new Bytecode(file.getConstPool());
code.addAload(0);
code.addAload(beanArgument);
code.addInvokestatic(
WeldClassChangeAware.class.getName(),
"addProxyFactory",
"(Lorg/jboss/weld/bean/proxy/ProxyFactory;)V");
CodeIterator it = method.getCodeAttribute().iterator();
it.skipConstructor();
it.insert(code.get());
}
}
}
return false;
}
/**
* Rebuilds a stack map table if the class file is for Java 6 or later. Java 5 or older Java VMs
* do not recognize a stack map table.
*
* @param pool used for making type hierarchy.
* @param cf rebuild if this class file is for Java 6 or later.
* @see #rebuildStackMap(ClassPool)
* @since 3.6
*/
public void rebuildStackMapIf6(ClassPool pool, ClassFile cf) throws BadBytecode {
if (cf.getMajorVersion() >= ClassFile.JAVA_6) rebuildStackMap(pool);
}