/***
* 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.ioc;
import java.lang.annotation.Annotation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import br.com.caelum.vraptor.ComponentRegistry;
import br.com.caelum.vraptor.Intercepts;
import br.com.caelum.vraptor.VRaptorException;
import br.com.caelum.vraptor.interceptor.Interceptor;
import br.com.caelum.vraptor.interceptor.InterceptorRegistry;
import br.com.caelum.vraptor.interceptor.InterceptorSequence;
@ApplicationScoped
public class InterceptorStereotypeHandler implements StereotypeHandler {
private static final Logger logger = LoggerFactory.getLogger(InterceptorStereotypeHandler.class);
private final InterceptorRegistry registry;
private final ComponentRegistry componentRegistry;
public InterceptorStereotypeHandler(InterceptorRegistry registry, ComponentRegistry componentRegistry) {
this.registry = registry;
this.componentRegistry = componentRegistry;
}
public Class<? extends Annotation> stereotype() {
return Intercepts.class;
}
public void handle(Class<?> type) {
if (Interceptor.class.isAssignableFrom(type)) {
registerInterceptor(type);
} else if (InterceptorSequence.class.isAssignableFrom(type)) {
registerInterceptorSequence(type);
} else {
throw new VRaptorException("Annotation " + Intercepts.class + " found in " + type
+ ", but it is neither an Interceptor nor an InterceptorSequence.");
}
}
@SuppressWarnings("unchecked")
private void registerInterceptor(Class<?> type) {
logger.debug("Found interceptor for " + type);
Class<? extends Interceptor> interceptorType = (Class<? extends Interceptor>) type;
registry.register(interceptorType);
}
@SuppressWarnings("unchecked")
private void registerInterceptorSequence(Class<?> type) {
logger.debug("Found interceptor sequence for " + type);
Class<? extends InterceptorSequence> interceptorSequenceType = (Class<? extends InterceptorSequence>) type;
registry.register(parseSequence(interceptorSequenceType));
}
private Class<? extends Interceptor>[] parseSequence(Class<? extends InterceptorSequence> type) {
try {
InterceptorSequence sequence = type.getConstructor().newInstance();
Class<? extends Interceptor>[] interceptors = sequence.getSequence();
for (Class<? extends Interceptor> interceptor : interceptors) {
componentRegistry.deepRegister(interceptor);
}
return interceptors;
} catch (Exception e) {
throw new VRaptorException("Problem ocurred while instantiating an interceptor sequence", e);
}
}
}