private TransformerManager findTransformerManager(ClassFileTransformer transformer) {
if (mTransformerManager.includesTransformer(transformer)) {
return mTransformerManager;
}
if (mRetransfomableTransformerManager != null
&& mRetransfomableTransformerManager.includesTransformer(transformer)) {
return mRetransfomableTransformerManager;
}
return null;
}
public synchronized boolean removeTransformer(ClassFileTransformer transformer) {
if (transformer == null) {
throw new NullPointerException("null passed as 'transformer' in removeTransformer");
}
TransformerManager mgr = findTransformerManager(transformer);
if (mgr != null) {
mgr.removeTransformer(transformer);
if (mgr.isRetransformable() && mgr.getTransformerCount() == 0) {
setHasRetransformableTransformers(mNativeAgent, false);
}
return true;
}
return false;
}
// WARNING: the native code knows the name & signature of this method
private byte[] transform(
ClassLoader loader,
String classname,
Class<?> classBeingRedefined,
ProtectionDomain protectionDomain,
byte[] classfileBuffer,
boolean isRetransformer) {
TransformerManager mgr =
isRetransformer ? mRetransfomableTransformerManager : mTransformerManager;
if (mgr == null) {
return null; // no manager, no transform
} else {
return mgr.transform(
loader, classname, classBeingRedefined, protectionDomain, classfileBuffer);
}
}
public synchronized void setNativeMethodPrefix(ClassFileTransformer transformer, String prefix) {
if (!isNativeMethodPrefixSupported()) {
throw new UnsupportedOperationException(
"setNativeMethodPrefix is not supported in this environment");
}
if (transformer == null) {
throw new NullPointerException("null passed as 'transformer' in setNativeMethodPrefix");
}
TransformerManager mgr = findTransformerManager(transformer);
if (mgr == null) {
throw new IllegalArgumentException("transformer not registered in setNativeMethodPrefix");
}
mgr.setNativeMethodPrefix(transformer, prefix);
String[] prefixes = mgr.getNativeMethodPrefixes();
setNativeMethodPrefixes(mNativeAgent, prefixes, mgr.isRetransformable());
}
public synchronized void addTransformer(
ClassFileTransformer transformer, boolean canRetransform) {
if (transformer == null) {
throw new NullPointerException("null passed as 'transformer' in addTransformer");
}
if (canRetransform) {
if (!isRetransformClassesSupported()) {
throw new UnsupportedOperationException(
"adding retransformable transformers is not supported in this environment");
}
if (mRetransfomableTransformerManager == null) {
mRetransfomableTransformerManager = new TransformerManager(true);
}
mRetransfomableTransformerManager.addTransformer(transformer);
if (mRetransfomableTransformerManager.getTransformerCount() == 1) {
setHasRetransformableTransformers(mNativeAgent, true);
}
} else {
mTransformerManager.addTransformer(transformer);
}
}