/***
* 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.observer;
import static java.util.Arrays.asList;
import static org.slf4j.LoggerFactory.getLogger;
import java.io.IOException;
import java.util.List;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.event.Observes;
import javax.inject.Inject;
import javax.servlet.http.HttpServletRequest;
import org.slf4j.Logger;
import br.com.caelum.vraptor.Consumes;
import br.com.caelum.vraptor.controller.ControllerMethod;
import br.com.caelum.vraptor.core.MethodInfo;
import br.com.caelum.vraptor.events.ReadyToExecuteMethod;
import br.com.caelum.vraptor.ioc.Container;
import br.com.caelum.vraptor.serialization.Deserializer;
import br.com.caelum.vraptor.serialization.Deserializers;
import br.com.caelum.vraptor.view.Status;
/**
* <strong>Important</strong>: this class must observe {@link ReadyToExecuteMethod}
* because it is fired just before {@link ExecuteMethod} execution
*
* @author Lucas Cavalcanti
* @author Rafael Ferreira
* @author Rodrigo Turini
*/
@ApplicationScoped
public class DeserializingObserver {
private final Deserializers deserializers;
private final Container container;
private static final Logger logger = getLogger(DeserializingObserver.class);
/**
* @deprecated CDI eyes only
*/
protected DeserializingObserver() {
this(null, null);
}
@Inject
public DeserializingObserver(Deserializers deserializers, Container container) {
this.deserializers = deserializers;
this.container = container;
}
public void deserializes(@Observes ReadyToExecuteMethod event, HttpServletRequest request,
MethodInfo methodInfo, Status status) throws IOException {
ControllerMethod method = event.getControllerMethod();
if (!method.containsAnnotation(Consumes.class)) return;
List<String> supported = asList(method.getMethod().getAnnotation(Consumes.class).value());
String contentType = mime(request.getContentType());
if (!supported.isEmpty() && !supported.contains(contentType)) {
unsupported("Request with media type [%s]. Expecting one of %s.", status, contentType, supported);
return;
}
Deserializer deserializer = deserializers.deserializerFor(contentType, container);
if (deserializer == null) {
unsupported("Unable to handle media type [%s]: no deserializer found.", status, contentType);
return;
}
Object[] deserialized = deserializer.deserialize(request.getInputStream(), method);
logger.debug("Deserialized parameters for {} are {} ", method, deserialized);
for (int i = 0; i < deserialized.length; i++) {
if (deserialized[i] != null) {
methodInfo.setParameter(i, deserialized[i]);
}
}
}
private String mime(String contentType) {
if (contentType.contains(";")) {
return contentType.split(";")[0];
}
return contentType;
}
private void unsupported(String message, Status status, Object... params) {
status.unsupportedMediaType(String.format(message, params));
}
}