/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.deltaspike.proxy.impl.invocation;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.InterceptionType;
import javax.enterprise.inject.spi.Interceptor;
import javax.interceptor.InterceptorBinding;
import org.apache.deltaspike.core.api.provider.BeanManagerProvider;
@ApplicationScoped
public class InterceptorLookup
{
private final Map<Method, List<Interceptor<?>>> cache = new HashMap<Method, List<Interceptor<?>>>();
public List<Interceptor<?>> lookup(Object instance, Method method)
{
List<Interceptor<?>> interceptors = cache.get(method);
if (interceptors == null)
{
interceptors = resolveInterceptors(instance, method);
cache.put(method, interceptors);
}
return interceptors;
}
protected List<Interceptor<?>> resolveInterceptors(Object instance, Method method)
{
BeanManager beanManager = BeanManagerProvider.getInstance().getBeanManager();
Annotation[] interceptorBindings = extractInterceptorBindings(beanManager, instance, method);
if (interceptorBindings.length > 0)
{
return beanManager.resolveInterceptors(InterceptionType.AROUND_INVOKE, interceptorBindings);
}
return new ArrayList<Interceptor<?>>();
}
protected Annotation[] extractInterceptorBindings(BeanManager beanManager, Object instance, Method method)
{
ArrayList<Annotation> bindings = new ArrayList<Annotation>();
addInterceptorBindings(beanManager, bindings, instance.getClass().getDeclaredAnnotations());
addInterceptorBindings(beanManager, bindings, method.getDeclaredAnnotations());
return bindings.toArray(new Annotation[bindings.size()]);
}
protected void addInterceptorBindings(BeanManager beanManager, ArrayList<Annotation> bindings,
Annotation[] declaredAnnotations)
{
for (Annotation annotation : declaredAnnotations)
{
if (bindings.contains(annotation))
{
continue;
}
Class<? extends Annotation> annotationType = annotation.annotationType();
if (annotationType.isAnnotationPresent(InterceptorBinding.class))
{
bindings.add(annotation);
}
if (beanManager.isStereotype(annotationType))
{
for (Annotation subAnnotation : annotationType.getDeclaredAnnotations())
{
if (bindings.contains(subAnnotation))
{
continue;
}
if (subAnnotation.annotationType().isAnnotationPresent(InterceptorBinding.class))
{
bindings.add(subAnnotation);
}
}
}
}
}
}