/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.jena.fuseki.servlets;
import static java.lang.String.format ;
import java.io.IOException ;
import javax.servlet.ServletOutputStream ;
import org.apache.jena.fuseki.FusekiLib ;
import org.apache.jena.fuseki.HttpNames ;
import org.openjena.atlas.web.MediaType ;
import org.openjena.atlas.web.TypedOutputStream ;
import org.openjena.riot.Lang ;
import org.openjena.riot.RiotWriter ;
import com.hp.hpl.jena.sparql.core.DatasetGraph ;
/**
* Servlet that serves up quads for a dataset.
* Combine with something for RDF GET on graphs?
*/
public class REST_Quads extends SPARQL_REST
{
// This is nearly SPARQL_REST_R
// Have a "serve quads", "serve triples" library.
// ResponseQuads, ResponseTriples
@Override
protected void doGet(HttpActionREST action)
{
if ( action.hasTarget() )
errorBadRequest("Attempt to use GET for quads and name a graph") ;
MediaType mediaType = contentNegotationQuads(action) ;
ServletOutputStream output ;
try { output = action.response.getOutputStream() ; }
catch (IOException ex) { errorOccurred(ex) ; output = null ; }
TypedOutputStream out = new TypedOutputStream(output, mediaType) ;
Lang lang = FusekiLib.langFromContentType(mediaType.getContentType()) ;
if ( action.verbose )
log.info(format("[%d] Get: Content-Type=%s, Charset=%s => %s",
action.id, mediaType.getContentType(), mediaType.getCharset(), lang.getName())) ;
if ( ! lang.isQuads() )
errorBadRequest("Not a quads format: "+mediaType) ;
action.beginRead() ;
try {
DatasetGraph dsg = action.getActiveDSG() ;
if ( lang == Lang.NQUADS )
RiotWriter.writeNQuads(out, dsg) ;
else if ( lang == Lang.TRIG )
errorBadRequest("TriG - Not implemented (yet) : "+mediaType) ;
else
errorBadRequest("No handled: "+mediaType) ;
success(action) ;
} finally { action.endRead() ; }
}
@Override
protected void doOptions(HttpActionREST action)
{
action.response.setHeader(HttpNames.hAllow, "GET, HEAD, OPTIONS") ;
action.response.setHeader(HttpNames.hContentLengh, "0") ;
success(action) ;
}
@Override
protected void doHead(HttpActionREST action)
{
if ( action.hasTarget() )
errorBadRequest("Attempt to use GET for quads and name a graph") ;
action.beginRead() ;
try {
MediaType mediaType = contentNegotationQuads(action) ;
success(action) ;
} finally { action.endRead() ; }
}
@Override
protected void doPost(HttpActionREST action)
{ errorMethodNotAllowed("POST") ; }
@Override
protected void doDelete(HttpActionREST action)
{ errorMethodNotAllowed("DELETE") ; }
@Override
protected void doPut(HttpActionREST action)
{ errorMethodNotAllowed("PUT") ; }
@Override
protected void doPatch(HttpActionREST action)
{ errorMethodNotAllowed("PATCH") ; }
}