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/**
* Copyright (C) 2006 Google Inc.
*
* 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 com.google.inject.internal;
import com.google.common.collect.Lists;
import net.sf.cglib.proxy.MethodProxy;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* Intercepts a method with a stack of interceptors.
*
* @author crazybob@google.com (Bob Lee)
*/
final class InterceptorStackCallback implements net.sf.cglib.proxy.MethodInterceptor {
private static final Set<String> AOP_INTERNAL_CLASSES = new HashSet<String>(Arrays.asList(
InterceptorStackCallback.class.getName(),
InterceptedMethodInvocation.class.getName(),
MethodProxy.class.getName()));
final MethodInterceptor[] interceptors;
final Method method;
public InterceptorStackCallback(Method method,
List<MethodInterceptor> interceptors) {
this.method = method;
this.interceptors = interceptors.toArray(new MethodInterceptor[interceptors.size()]);
}
public Object intercept(Object proxy, Method method, Object[] arguments,
MethodProxy methodProxy) throws Throwable {
return new InterceptedMethodInvocation(proxy, methodProxy, arguments).proceed();
}
private class InterceptedMethodInvocation implements MethodInvocation {
final Object proxy;
final Object[] arguments;
final MethodProxy methodProxy;
int index = -1;
public InterceptedMethodInvocation(Object proxy, MethodProxy methodProxy,
Object[] arguments) {
this.proxy = proxy;
this.methodProxy = methodProxy;
this.arguments = arguments;
}
public Object proceed() throws Throwable {
try {
index++;
return index == interceptors.length
? methodProxy.invokeSuper(proxy, arguments)
: interceptors[index].invoke(this);
} catch (Throwable t) {
pruneStacktrace(t);
throw t;
} finally {
index--;
}
}
public Method getMethod() {
return method;
}
public Object[] getArguments() {
return arguments;
}
public Object getThis() {
return proxy;
}
public AccessibleObject getStaticPart() {
return getMethod();
}
}
/**
* Removes stacktrace elements related to AOP internal mechanics from the
* throwable's stack trace and any causes it may have.
*/
private void pruneStacktrace(Throwable throwable) {
for(Throwable t = throwable; t != null; t = t.getCause()) {
StackTraceElement[] stackTrace = t.getStackTrace();
List<StackTraceElement> pruned = Lists.newArrayList();
for (StackTraceElement element : stackTrace) {
String className = element.getClassName();
if (!AOP_INTERNAL_CLASSES.contains(className) && !className.contains("$EnhancerByGuice$")) {
pruned.add(element);
}
}
t.setStackTrace(pruned.toArray(new StackTraceElement[pruned.size()]));
}
}
}
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