/**
* Copyright (C) 2003-2008 eXo Platform SAS.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Affero General Public License
* as published by the Free Software Foundation; either version 3
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see<http://www.gnu.org/licenses/>.
*/
package org.etk.core.rest.impl.provider;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;
import javax.ws.rs.ext.Providers;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.UnmarshalException;
import javax.xml.bind.annotation.XmlRootElement;
import org.etk.common.logging.Logger;
import org.etk.core.rest.provider.EntityProvider;
import org.etk.core.rest.impl.header.MediaTypeHelper;
@Provider
@Consumes({ MediaType.APPLICATION_XML, MediaType.TEXT_XML, MediaType.APPLICATION_XHTML_XML })
@Produces({ MediaType.APPLICATION_XML, MediaType.TEXT_XML, MediaType.APPLICATION_XHTML_XML, MediaTypeHelper.WADL })
public class JAXBObjectEntityProvider implements EntityProvider<Object> {
/**
* Logger.
*/
private static final Logger LOG = Logger.getLogger(JAXBObjectEntityProvider.class);
/**
* @see Providers
*/
@Context
private Providers providers;
/**
* {@inheritDoc}
*/
public boolean isReadable(Class<?> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return type.getAnnotation(XmlRootElement.class) != null;
}
/**
* {@inheritDoc}
*/
public Object readFrom(Class<Object> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap<String, String> httpHeaders,
InputStream entityStream) throws IOException {
try {
JAXBContext jaxbctx = getJAXBContext(type, mediaType);
return jaxbctx.createUnmarshaller().unmarshal(entityStream);
} catch (UnmarshalException e) {
// if can't read from stream (e.g. steam is empty)
if (LOG.isDebugEnabled())
e.printStackTrace();
return null;
} catch (JAXBException e) {
throw new IOException("Can't read from input stream " + e);
}
}
/**
* {@inheritDoc}
*/
public long getSize(Object t,
Class<?> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return -1;
}
/**
* {@inheritDoc}
*/
public boolean isWriteable(Class<?> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return type.getAnnotation(XmlRootElement.class) != null;
}
/**
* {@inheritDoc}
*/
public void writeTo(Object t,
Class<?> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap<String, Object> httpHeaders,
OutputStream entityStream) throws IOException {
try {
JAXBContext jaxbctx = getJAXBContext(type, mediaType);
Marshaller m = jaxbctx.createMarshaller();
// Must respect application specified character set.
String charset = mediaType.getParameters().get("charset");
if (charset != null)
m.setProperty(Marshaller.JAXB_ENCODING, charset);
m.marshal(t, entityStream);
} catch (JAXBException e) {
throw new IOException("Can't write to output stream " + e);
}
}
/**
* @param type type
* @param mediaType media type
* @return JAXBContext JAXBContext
* @throws JAXBException if JAXBContext creation failed
*/
protected JAXBContext getJAXBContext(Class<?> type, MediaType mediaType) throws JAXBException {
ContextResolver<JAXBContextResolver> resolver = providers.getContextResolver(JAXBContextResolver.class,
mediaType);
if (resolver == null)
throw new RuntimeException("Not found any JAXBContextResolver for media type " + mediaType);
JAXBContextResolver jaxbres = resolver.getContext(type);
return jaxbres.getJAXBContext(type);
}
}