private InjectionNode innerGenerateProxyCode(InjectionNode injectionNode) {
AOPProxyAspect aopProxyAspect = injectionNode.getAspect(AOPProxyAspect.class);
JDefinedClass definedClass;
String proxyClassName = injectionNode.getClassName() + "_AOPProxy";
ASTInjectionAspect injectionAspect = injectionNode.getAspect(ASTInjectionAspect.class);
ConstructorInjectionPoint constructorInjectionPoint =
injectionAspect.getConstructorInjectionPoint();
ConstructorInjectionPoint proxyConstructorInjectionPoint =
new ConstructorInjectionPoint(ASTAccessModifier.PUBLIC);
try {
definedClass = codeModel._class(JMod.PUBLIC, proxyClassName, ClassType.CLASS);
annotateGeneratedClass(definedClass);
// extending injectionNode
definedClass._extends(codeModel.ref(injectionNode.getClassName()));
// copy constructor elements and add aop interceptors
JMethod constructor = definedClass.constructor(JMod.PUBLIC);
// converting exceptions into runtime exceptions
proxyConstructorInjectionPoint.addThrows(constructorInjectionPoint.getThrowsTypes());
for (ASTType throwType : constructorInjectionPoint.getThrowsTypes()) {
constructor._throws(codeModel.ref(throwType.getName()));
}
JBlock constructorBody = constructor.body();
List<JVar> superArguments = new ArrayList<JVar>();
for (InjectionNode node : constructorInjectionPoint.getInjectionNodes()) {
String paramName = namer.generateName(node);
JVar param = constructor.param(codeModel.ref(node.getClassName()), paramName);
superArguments.add(param);
proxyConstructorInjectionPoint.addInjectionNode(node);
}
// super construction
JInvocation constructorInvocation = constructorBody.invoke(SUPER_REF);
for (JVar paramArgument : superArguments) {
constructorInvocation.arg(paramArgument);
}
// method interceptors
Map<ASTMethod, Map<InjectionNode, JFieldVar>> interceptorFields =
new HashMap<ASTMethod, Map<InjectionNode, JFieldVar>>();
for (Map.Entry<ASTMethod, Set<InjectionNode>> methodInterceptorEntry :
aopProxyAspect.getMethodInterceptors().entrySet()) {
buildMethodInterceptor(
definedClass,
proxyConstructorInjectionPoint,
constructor,
constructorBody,
interceptorFields,
methodInterceptorEntry);
}
} catch (JClassAlreadyExistsException e) {
logger.error("JClassAlreadyExistsException while building AOP Proxy", e);
} catch (ClassNotFoundException e) {
logger.error("ClassNotFoundException while building AOP Proxy", e);
}
return buildProxyInjectionNode(
injectionNode, proxyClassName, injectionAspect, proxyConstructorInjectionPoint);
}
private JExpression buildInterceptorChain(
JDefinedClass definedClass,
ASTMethod method,
Map<ASTParameter, JVar> parameterMap,
Set<InjectionNode> interceptors,
Map<InjectionNode, JFieldVar> interceptorNameMap) {
try {
JDefinedClass methodExecutionClass =
definedClass._class(
JMod.PRIVATE | JMod.FINAL,
namer.generateClassName(MethodInterceptorChain.MethodExecution.class));
methodExecutionClass._implements(MethodInterceptorChain.MethodExecution.class);
// setup constructor with needed parameters
JMethod constructor = methodExecutionClass.constructor(JMod.PUBLIC);
JBlock constructorbody = constructor.body();
List<JExpression> methodParameters = new ArrayList<JExpression>();
for (ASTParameter parameter : method.getParameters()) {
JType parameterType = parameterMap.get(parameter).type();
JVar param = constructor.param(parameterType, namer.generateName(parameterType));
JFieldVar field =
methodExecutionClass.field(
JMod.PRIVATE, parameterType, namer.generateName(parameterType));
constructorbody.assign(field, param);
methodParameters.add(field);
}
// getMethod()
JMethod getMethod =
methodExecutionClass.method(
JMod.PUBLIC, Method.class, MethodInterceptorChain.MethodExecution.GET_METHOD);
JInvocation getMethodInvocation =
definedClass.dotclass().invoke(CLASS_GET_METHOD).arg(method.getName());
getMethod.body()._return(getMethodInvocation);
getMethod._throws(NoSuchMethodException.class);
for (ASTParameter astParameter : method.getParameters()) {
getMethodInvocation.arg(codeModel.ref(astParameter.getASTType().getName()).dotclass());
}
// invoke()
JMethod invokeMethod =
methodExecutionClass.method(
JMod.PUBLIC, Object.class, MethodInterceptorChain.MethodExecution.INVOKE);
// add all throws of contained method
for (ASTType throwable : method.getThrowsTypes()) {
invokeMethod._throws(codeModel.ref(throwable.getName()));
}
JInvocation superCall = definedClass.staticRef(SUPER_REF).invoke(method.getName());
for (JExpression methodParam : methodParameters) {
superCall.arg(methodParam);
}
if (method.getReturnType().equals(ASTVoidType.VOID)) {
invokeMethod.body().add(superCall);
invokeMethod.body()._return(JExpr._null());
} else {
invokeMethod.body()._return(superCall);
}
JInvocation methodExecutionInvocation = JExpr._new(methodExecutionClass);
for (ASTParameter astParameter : method.getParameters()) {
methodExecutionInvocation.arg(parameterMap.get(astParameter));
}
JInvocation newInterceptorInvocation =
JExpr._new(codeModel.ref(MethodInterceptorChain.class))
.arg(methodExecutionInvocation)
.arg(JExpr._this());
for (InjectionNode interceptor : interceptors) {
newInterceptorInvocation.arg(interceptorNameMap.get(interceptor));
}
return newInterceptorInvocation;
} catch (JClassAlreadyExistsException e) {
throw new TransfuseAnalysisException("Class already defined while generating inner class", e);
}
}
