/***
* 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.io.IOException;
import java.util.Arrays;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import br.com.caelum.vraptor.Consumes;
import br.com.caelum.vraptor.InterceptionException;
import br.com.caelum.vraptor.Intercepts;
import br.com.caelum.vraptor.Lazy;
import br.com.caelum.vraptor.core.InterceptorStack;
import br.com.caelum.vraptor.core.MethodInfo;
import br.com.caelum.vraptor.deserialization.Deserializer;
import br.com.caelum.vraptor.deserialization.Deserializers;
import br.com.caelum.vraptor.ioc.Container;
import br.com.caelum.vraptor.resource.ResourceMethod;
import br.com.caelum.vraptor.view.Status;
/**
* Important: this interceptor must be after the {@link ParametersInstantiatorInterceptor}
*
* @author Lucas Cavalcanti
* @author Rafael Ferreira
*/
@Intercepts(after=ParametersInstantiatorInterceptor.class, before=ExecuteMethodInterceptor.class)
@Lazy
public class DeserializingInterceptor implements Interceptor {
private final HttpServletRequest request;
private final Deserializers deserializers;
private final MethodInfo methodInfo;
private final Container container;
private final Status status;
private static final Logger logger = LoggerFactory.getLogger(DeserializingInterceptor.class);
public DeserializingInterceptor(HttpServletRequest servletRequest, Deserializers deserializers,
MethodInfo methodInfo, Container container, Status status) {
this.request = servletRequest;
this.deserializers = deserializers;
this.methodInfo = methodInfo;
this.container = container;
this.status = status;
}
public boolean accepts(ResourceMethod method) {
return method.containsAnnotation(Consumes.class);
}
public void intercept(InterceptorStack stack, ResourceMethod method, Object resourceInstance) throws InterceptionException {
Consumes consumesAnnotation = method.getMethod().getAnnotation(Consumes.class);
List<String> supported = Arrays.asList(consumesAnnotation.value());
if(request.getContentType() == null) {
logger.warn("Request does not have Content-Type and parameters will be not deserialized");
stack.next(method, resourceInstance);
return;
}
String contentType = mime(request.getContentType());
if (!supported.isEmpty() && !supported.contains(contentType)) {
unsupported(String.format("Request with media type [%s]. Expecting one of %s.",
contentType, supported));
return;
}
try {
Deserializer deserializer = deserializers.deserializerFor(contentType, container);
if (deserializer == null) {
unsupported(String.format("Unable to handle media type [%s]: no deserializer found.", contentType));
return;
}
Object[] deserialized = deserializer.deserialize(request.getInputStream(), method);
Object[] parameters = methodInfo.getParameters();
logger.debug("Deserialized parameters for {} are {} ", method, deserialized);
// TODO: a new array should be created and then a call to setParameters
// setting methodInfo.getParameters() works only because we dont (yet)
// return a defensive copy
for (int i = 0; i < deserialized.length; i++) {
if (deserialized[i] != null) {
parameters[i] = deserialized[i];
}
}
stack.next(method, resourceInstance);
} catch (IOException e) {
throw new InterceptionException(e);
}
}
private String mime(String contentType) {
if (contentType.contains(";")) {
return contentType.split(";")[0];
}
return contentType;
}
private void unsupported(String message) {
this.status.unsupportedMediaType(message);
}
}