/*
* 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.clerezza.rdf.jena.serializer;
import java.io.OutputStream;
import org.apache.clerezza.rdf.core.serializedform.SerializingProvider;
import org.apache.clerezza.rdf.core.serializedform.SupportedFormat;
import org.apache.clerezza.rdf.jena.facade.JenaGraph;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.RDFWriter;
import org.apache.clerezza.rdf.core.TripleCollection;
import org.apache.clerezza.rdf.core.serializedform.UnsupportedSerializationFormatException;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Service;
/**
* A {@link org.apache.clerezza.rdf.core.serializedform.SerializingProvider} based on Jena
*
* @author mir
*/
/*
* see http://jena.sourceforge.net/IO/iohowto.html
*/
@Component
@Service(SerializingProvider.class)
@Property(name="supportedFormat", value={SupportedFormat.RDF_XML,
SupportedFormat.TURTLE, SupportedFormat.X_TURTLE,
SupportedFormat.N_TRIPLE, SupportedFormat.N3})
@SupportedFormat({SupportedFormat.RDF_XML,
SupportedFormat.TURTLE, SupportedFormat.X_TURTLE,
SupportedFormat.N_TRIPLE, SupportedFormat.N3})
public class JenaSerializerProvider implements SerializingProvider {
@Override
public void serialize(OutputStream serializedGraph, TripleCollection tc,
String formatIdentifier) {
String jenaFormat = getJenaFormat(formatIdentifier);
com.hp.hpl.jena.graph.Graph graph = new JenaGraph(tc);
Model model = ModelFactory.createModelForGraph(graph);
RDFWriter writer = model.getWriter(jenaFormat);
if ("RDF/XML".equals(jenaFormat)) {
//jena complains about some URIs that aren't truely bad
//see: http://tech.groups.yahoo.com/group/jena-dev/message/38313
writer.setProperty("allowBadURIs", Boolean.TRUE);
}
writer.write(model, serializedGraph, "");
}
private String getJenaFormat(String formatIdentifier) {
int semicolonPos = formatIdentifier.indexOf(';');
if (semicolonPos > -1) {
formatIdentifier = formatIdentifier.substring(0, semicolonPos);
}
if (formatIdentifier.equals(SupportedFormat.RDF_XML)) {
return "RDF/XML";
}
if (formatIdentifier.equals(SupportedFormat.TURTLE) ||
formatIdentifier.equals(SupportedFormat.X_TURTLE)) {
return "TURTLE";
}
if (formatIdentifier.equals(SupportedFormat.N3)) {
return "N3";
}
if (formatIdentifier.equals(SupportedFormat.N_TRIPLE)) {
return "N-TRIPLE";
}
throw new UnsupportedSerializationFormatException(formatIdentifier);
}
}