/***
* Copyright (c) 2009 Caelum - www.caelum.com.br/opensource All rights reserved.
*
* 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 br.com.caelum.vraptor.interceptor;
import java.util.List;
import br.com.caelum.vraptor.Intercepts;
import br.com.caelum.vraptor.ioc.ApplicationScoped;
/**
* An interceptor registry that sorts interceptors based on their before and after conditions
*
* @author Lucas Cavalcanti
* @author David Paniz
* @since 3.3.0
*
*/
@ApplicationScoped
public class TopologicalSortedInterceptorRegistry implements InterceptorRegistry {
private Graph<Class<? extends Interceptor>> set = new Graph<Class<? extends Interceptor>>();
public List<Class<? extends Interceptor>> all() {
return set.topologicalOrder();
}
public void register(Class<? extends Interceptor>... interceptors) {
for (Class<? extends Interceptor> interceptor : interceptors) {
Intercepts intercepts = interceptor.getAnnotation(Intercepts.class);
if (intercepts != null) {
addEdges(interceptor, intercepts.before(), intercepts.after());
} else {
addDefaultEdges(interceptor);
}
}
}
private void addDefaultEdges(Class<? extends Interceptor> interceptor) {
set.addEdge(interceptor, ExecuteMethodInterceptor.class);
if (!interceptor.equals(ResourceLookupInterceptor.class)) {
set.addEdge(ResourceLookupInterceptor.class, interceptor);
}
}
private void addEdges(Class<? extends Interceptor> interceptor, Class<? extends Interceptor>[] before, Class<? extends Interceptor>[] after) {
set.addEdges(interceptor, before);
for (Class<? extends Interceptor> other : after) {
set.addEdge(other, interceptor);
}
}
}