/
RdfStreamProvider.java
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/
RdfStreamProvider.java
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/**
* Copyright 2013 DuraSpace, Inc.
*
* 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 org.fcrepo.http.commons.responses;
import static com.google.common.util.concurrent.Futures.addCallback;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import org.fcrepo.kernel.utils.LogoutCallback;
import org.fcrepo.kernel.utils.iterators.RdfStream;
import org.springframework.stereotype.Component;
/**
* Provides serialization for streaming RDF results.
*
* @author ajs6f
* @date Nov 19, 2013
*/
@Provider
@Component
public class RdfStreamProvider implements MessageBodyWriter<RdfStream> {
@Override
public boolean isWriteable(final Class<?> type, final Type genericType,
final Annotation[] annotations, final MediaType mediaType) {
return RdfStream.class.isAssignableFrom(type) ;
}
@Override
public long getSize(final RdfStream t, final Class<?> type, final Type genericType,
final Annotation[] annotations, final MediaType mediaType) {
// We do not know how long the stream is
return -1;
}
@Override
public void writeTo(final RdfStream rdfStream, final Class<?> type, final Type genericType,
final Annotation[] annotations, final MediaType mediaType,
final MultivaluedMap<String, Object> httpHeaders,
final OutputStream entityStream) throws IOException,
WebApplicationException {
final RdfStreamStreamingOutput streamOutput =
new RdfStreamStreamingOutput(rdfStream, mediaType);
addCallback(streamOutput, new LogoutCallback(rdfStream.session()));
streamOutput.write(entityStream);
}
}