/**
* Copyright (C) 2010 Daniel Manzke <daniel.manzke@googlemail.com>
*
* 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 de.devsurf.injection.guice.aop.feature;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.inject.Singleton;
import javax.interceptor.Interceptor;
import de.devsurf.injection.guice.install.BindingStage;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import com.google.inject.matcher.Matcher;
import com.google.inject.matcher.Matchers;
import de.devsurf.injection.guice.aop.ClassMatcher;
import de.devsurf.injection.guice.aop.GuiceMethodInterceptor;
import de.devsurf.injection.guice.aop.Invoke;
import de.devsurf.injection.guice.aop.MethodMatcher;
import de.devsurf.injection.guice.scanner.features.BindingScannerFeature;
@Singleton
public class InterceptorFeature extends BindingScannerFeature {
private Logger _logger = Logger.getLogger(InterceptorFeature.class.getName());
@Override
public BindingStage accept(Class<Object> annotatedClass, Map<String, Annotation> annotations) {
if (annotations.containsKey(Interceptor.class.getName())) {
return BindingStage.BOOT;
}
return BindingStage.IGNORE;
}
@SuppressWarnings("unchecked")
@Override
public void process(Class<Object> annotatedClass, Map<String, Annotation> annotations) {
MethodInterceptor interceptor;
final Object possibleInterceptor = injector.getInstance(annotatedClass);
Matcher<? super Class<?>> classMatcher = null;
Matcher<? super Method> methodMatcher = null;
if (possibleInterceptor instanceof GuiceMethodInterceptor) {
interceptor = (MethodInterceptor) possibleInterceptor;
GuiceMethodInterceptor guiceInterceptor = (GuiceMethodInterceptor) interceptor;
classMatcher = guiceInterceptor.getClassMatcher();
methodMatcher = guiceInterceptor.getMethodMatcher();
} else {
Method[] declaredMethods = annotatedClass.getDeclaredMethods();
Map<Class<? extends Annotation>, Method> methods = new HashMap<Class<? extends Annotation>, Method>();
for (Method method : declaredMethods) {
Annotation[] methodAnnotations = method.getAnnotations();
for (Annotation methodAnnotation : methodAnnotations) {
methods.put(methodAnnotation.annotationType(), method);
}
}
try {
if (methods.containsKey(ClassMatcher.class)) {
Method method = methods.get(ClassMatcher.class);
Type genericReturnType = method.getGenericReturnType();
if (GuiceMethodInterceptor.CLASS_MATCHER_TYPE.equals(genericReturnType)) {
classMatcher = (Matcher<? super Class<?>>) method.invoke(
possibleInterceptor, new Object[0]);
} else {
_logger.log(Level.WARNING,
"Return Type of the annotated @ClassMatcher-Method, does not return: "
+ GuiceMethodInterceptor.CLASS_MATCHER_TYPE
+ " instead it returns " + genericReturnType);
}
}
if (methods.containsKey(MethodMatcher.class)) {
Method method = methods.get(MethodMatcher.class);
Type genericReturnType = method.getGenericReturnType();
if (GuiceMethodInterceptor.METHOD_MATCHER_TYPE.equals(genericReturnType)) {
methodMatcher = (Matcher<? super Method>) method.invoke(
possibleInterceptor, new Object[0]);
} else {
_logger.log(Level.WARNING,
"Return Type of the annotated @MethodMatcher-Method, does not return: "
+ GuiceMethodInterceptor.METHOD_MATCHER_TYPE
+ " instead it returns " + genericReturnType);
}
}
} catch (Exception e) {
_logger
.log(
Level.WARNING,
"Skipping process(..) of \""
+ annotatedClass
+ "\", because an Exception occured while trying to invoke a Method of the found Intercepter.",
e);
return;
}
if (possibleInterceptor instanceof MethodInterceptor) {
interceptor = (MethodInterceptor) possibleInterceptor;
} else {
if (methods.containsKey(Invoke.class)) {
final Method method = methods.get(Invoke.class);
Class<?>[] parameterTypes = method.getParameterTypes();
if (parameterTypes != null && parameterTypes.length == 1
&& parameterTypes[0] == MethodInvocation.class) {
interceptor = new MethodInterceptor() {
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
return method.invoke(possibleInterceptor, invocation);
}
};
} else {
_logger
.log(
Level.WARNING,
"Skipping \""
+ annotatedClass
+ "\", because the Parameter of the with @Invoke annotated Method \""
+ method.getName()
+ "\" doesn't match the expected one. "
+ method.getName() + "(MethodInvocation invocation)");
return;
}
} else {
_logger.log(Level.WARNING, "Skipping \"" + annotatedClass
+ "\" is either Child of \""
+ GuiceMethodInterceptor.class.getName() + "\" / \""
+ MethodInterceptor.class.getName()
+ "\" nor has a Method annotated with \"" + Invoke.class.getName()
+ "\"");
return;
}
}
}
if (classMatcher == null) {
classMatcher = Matchers.any();
}
if (methodMatcher == null) {
methodMatcher = Matchers.any();
}
_binder.bindInterceptor(classMatcher, methodMatcher, interceptor);
}
}