/*
* 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.util.List ;
import javax.servlet.http.HttpServletRequest ;
import javax.servlet.http.HttpServletResponse ;
import org.apache.jena.fuseki.HttpNames ;
import org.apache.jena.fuseki.migrate.GraphLoadUtils ;
import org.openjena.atlas.lib.InternalErrorException ;
import org.openjena.riot.RiotException ;
import com.hp.hpl.jena.query.Dataset ;
import com.hp.hpl.jena.query.DatasetFactory ;
import com.hp.hpl.jena.query.Query ;
import com.hp.hpl.jena.rdf.model.Model ;
import com.hp.hpl.jena.rdf.model.ModelFactory ;
import com.hp.hpl.jena.sparql.core.DatasetDescription ;
public class SPARQL_QueryGeneral extends SPARQL_Query
{
final static int MaxTriples = 100*1000 ;
public SPARQL_QueryGeneral(boolean verbose)
{
super(verbose) ;
}
public SPARQL_QueryGeneral()
{ this(false) ; }
@Override
protected void validate(HttpServletRequest request)
{
validate(request, allParams) ;
}
@Override
protected void validateQuery(HttpActionQuery action, Query query)
{
// One or the other,
}
@Override
protected String mapRequestToDataset(String uri)
{ return null ; }
@Override
protected Dataset decideDataset(HttpActionQuery action, Query query, String queryStringLog)
{
action.datasetDesc = getDatasetDescription(action) ;
// To the context.
DatasetDescription datasetDesc = action.datasetDesc ;
if ( datasetDesc == null )
datasetDesc = getDatasetDescription(query) ;
if ( datasetDesc == null )
errorBadRequest("No dataset description in protocol request or in the query string") ;
return datasetFromDescription(action, datasetDesc) ;
}
@Override
protected boolean requestNoQueryString(HttpServletRequest request, HttpServletResponse response)
{
if ( HttpNames.METHOD_POST.equals(request.getMethod().toUpperCase()) )
return true ;
errorBadRequest("No query string given") ;
return false ;
}
/**
* Construct a Dataset based on a dataset description.
*/
protected static Dataset datasetFromDescription(HttpActionQuery action, DatasetDescription datasetDesc)
{
try {
if ( datasetDesc == null )
return null ;
if ( datasetDesc.isEmpty() )
return null ;
List<String> graphURLs = datasetDesc.getDefaultGraphURIs() ;
List<String> namedGraphs = datasetDesc.getNamedGraphURIs() ;
if ( graphURLs.size() == 0 && namedGraphs.size() == 0 )
return null ;
Dataset dataset = DatasetFactory.createMem() ;
// Look in cache for loaded graphs!!
// ---- Default graph
{
Model model = ModelFactory.createDefaultModel() ;
for ( String uri : graphURLs )
{
if ( uri == null || uri.equals("") )
throw new InternalErrorException("Default graph URI is null or the empty string") ;
try {
//TODO Clearup - RIOT integration.
GraphLoadUtils.loadModel(model, uri, MaxTriples) ;
log.info(format("[%d] Load (default graph) %s", action.id, uri)) ;
} catch (RiotException ex) {
log.info(format("[%d] Parsing error loading %s: %s", action.id, uri, ex.getMessage())) ;
errorBadRequest("Failed to load URL (parse error) "+uri+" : "+ex.getMessage()) ;
} catch (Exception ex)
{
log.info(format("[%d] Failed to load (default) %s: %s", action.id, uri, ex.getMessage())) ;
errorBadRequest("Failed to load URL "+uri) ;
}
}
dataset.setDefaultModel(model) ;
}
// ---- Named graphs
if ( namedGraphs != null )
{
for ( String uri : namedGraphs )
{
if ( uri == null || uri.equals("") )
throw new InternalErrorException("Named graph URI is null or the empty string") ;
try {
Model model = ModelFactory.createDefaultModel() ;
GraphLoadUtils.loadModel(model, uri, MaxTriples) ;
log.info(format("[%d] Load (named graph) %s", action.id, uri)) ;
dataset.addNamedModel(uri, model) ;
} catch (RiotException ex) {
log.info(format("[%d] Parsing error loading %s: %s", action.id, uri, ex.getMessage())) ;
errorBadRequest("Failed to load URL (parse error) "+uri+" : "+ex.getMessage()) ;
} catch (Exception ex)
{
log.info(format("[%d] Failed to load (named graph) %s: %s", action.id, uri, ex.getMessage())) ;
errorBadRequest("Failed to load URL "+uri) ;
}
}
}
return dataset ;
}
catch (ActionErrorException ex) { throw ex ; }
catch (Exception ex)
{
log.info(format("[%d] SPARQL parameter error: "+ex.getMessage(),action.id, ex)) ;
errorBadRequest("Parameter error: "+ex.getMessage());
return null ;
}
}
}