private void injectCode(MethodInfo methodInfo) throws IOException {
if (methodInfo.getCode() == null) {
return;
}
InterceptorConstants interceptorConstants =
getOrInsertInterceptorConstants(methodInfo.getInterceptorClass());
fixupSignature(methodInfo.getSignature());
Map<String, Integer> wrapperMethods =
getOrInsertPrimitiveWrapperMethods(methodInfo.getSignature());
ByteArrayOutputStream codeToInject = new ByteArrayOutputStream();
InstructionsFacility instructionsFacility =
new InstructionsFacility(
new DataOutputStream(codeToInject),
methodInfo.getSignature(),
interceptorConstants,
wrapperMethods);
instructionsFacility.generateInterceptorInstantiationCode();
instructionsFacility.generateInterceptorMethodParametersCode(getObjectClassIndex());
instructionsFacility.generateObjectArrayFillingCode();
instructionsFacility.generateInterceptorInvocationCode(
interceptorConstants.getInterceptorMethod());
Code code = methodInfo.getCode();
int originalStackSize = code.getMaxStack();
code.setMaxStack(Math.max(originalStackSize, instructionsFacility.getStackSizeNeeded()));
code.setInjected(codeToInject.toByteArray());
code.refresh();
}
private InterceptorConstants getOrInsertInterceptorConstants(Class interceptorClass)
throws IOException {
if (interceptorClass.getDeclaredMethods().length == 0) {
throw new InvalidClassException("Interceptor class format not valid.");
}
InterceptorConstants interceptorConstants = new InterceptorConstants();
interceptorConstants.setInterceptorClassName(
getOrInsertUtf8(interceptorClass.getName().replace(".", "/")));
interceptorConstants.setInterceptorClass(
getOrInsertClass(interceptorConstants.getInterceptorClassName()));
interceptorConstants.setInterceptorMethodName(
getOrInsertUtf8(Constants.INTERCEPTOR_METHOD_NAME));
interceptorConstants.setInterceptorMethodType(
getOrInsertUtf8(Constants.INTERCEPTOR_METHOD_TYPE));
interceptorConstants.setInterceptorMethodNameAndType(
getOrInsertNameAndType(
interceptorConstants.getInterceptorMethodName(),
interceptorConstants.getInterceptorMethodType()));
interceptorConstants.setInterceptorMethod(
getOrInsertMethodRef(
interceptorConstants.getInterceptorClass(),
interceptorConstants.getInterceptorMethodNameAndType()));
interceptorConstants.setConstructorName(getOrInsertUtf8(Constants.DEFAULT_CONSTRUCTOR_NAME));
interceptorConstants.setConstructorType(getOrInsertUtf8(Constants.DEFAULT_CONSTRUCTOR_TYPE));
interceptorConstants.setConstructorNameAndType(
getOrInsertNameAndType(
interceptorConstants.getConstructorName(), interceptorConstants.getConstructorType()));
interceptorConstants.setConstructor(
getOrInsertMethodRef(
interceptorConstants.getInterceptorClass(),
interceptorConstants.getConstructorNameAndType()));
return interceptorConstants;
}
