/*
* 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.atlas.web.MediaType ;
import org.apache.jena.atlas.web.TypedOutputStream ;
import org.apache.jena.fuseki.HttpNames ;
import org.apache.jena.riot.* ;
import com.hp.hpl.jena.graph.Graph ;
/** Only the READ operations */
public class SPARQL_REST_R extends SPARQL_REST
{
public SPARQL_REST_R()
{ super() ; }
@Override
protected String mapRequestToDataset(String uri) { return mapRequestToDatasetLongest$(uri) ; }
@Override
protected void doGet(HttpAction action)
{
// Assume success - do the set up before grabbing the lock.
// Sets content type.
MediaType mediaType = HttpAction.contentNegotationRDF(action) ;
ServletOutputStream output ;
try { output = action.response.getOutputStream() ; }
catch (IOException ex) { errorOccurred(ex) ; output = null ; }
TypedOutputStream out = new TypedOutputStream(output, mediaType) ;
Lang lang = RDFLanguages.contentTypeToLang(mediaType.getContentType()) ;
if ( action.verbose )
log.info(format("[%d] Get: Content-Type=%s, Charset=%s => %s",
action.id, mediaType.getContentType(), mediaType.getCharset(), lang.getName())) ;
action.beginRead() ;
try {
Target target = determineTarget(action) ;
if ( log.isDebugEnabled() )
log.debug("GET->"+target) ;
boolean exists = target.exists() ;
if ( ! exists )
errorNotFound("No such graph: <"+target.name+">") ;
// If we want to set the Content-Length, we need to buffer.
//response.setContentLength(??) ;
String ct = lang.getContentType().toHeaderString() ;
action.response.setContentType(ct) ;
Graph g = target.graph() ;
//Special case RDF/XML to be the plain (faster, less readable) form
RDFFormat fmt =
( lang == Lang.RDFXML ) ? RDFFormat.RDFXML_PLAIN : RDFWriterRegistry.defaultSerialization(lang) ;
RDFDataMgr.write(out, g, fmt) ;
success(action) ;
} finally { action.endRead() ; }
}
@Override
protected void doOptions(HttpAction action)
{
action.response.setHeader(HttpNames.hAllow, "GET,HEAD,OPTIONS") ;
action.response.setHeader(HttpNames.hContentLengh, "0") ;
success(action) ;
}
@Override
protected void doHead(HttpAction action)
{
action.beginRead() ;
try {
Target target = determineTarget(action) ;
if ( log.isDebugEnabled() )
log.debug("HEAD->"+target) ;
if ( ! target.exists() )
{
successNotFound(action) ;
return ;
}
MediaType mediaType = HttpAction.contentNegotationRDF(action) ;
success(action) ;
} finally { action.endRead() ; }
}
@Override
protected void doPost(HttpAction action)
{ errorMethodNotAllowed("POST") ; }
@Override
protected void doDelete(HttpAction action)
{ errorMethodNotAllowed("DELETE") ; }
@Override
protected void doPut(HttpAction action)
{ errorMethodNotAllowed("PUT") ; }
@Override
protected void doPatch(HttpAction action)
{ errorMethodNotAllowed("PATCH") ; }
}