/*
* 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.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import org.junit.Assert;
import org.junit.Test;
import org.apache.clerezza.rdf.core.Graph;
import org.apache.clerezza.rdf.core.MGraph;
import org.apache.clerezza.rdf.core.impl.SimpleMGraph;
import org.apache.clerezza.rdf.core.serializedform.SerializingProvider;
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 org.apache.clerezza.rdf.core.BNode;
import org.apache.clerezza.rdf.core.LiteralFactory;
import org.apache.clerezza.rdf.core.UriRef;
import org.apache.clerezza.rdf.core.impl.TripleImpl;
/**
* Serializes a Graph to different formats
*
* @author mir
*/
public class TestJenaSerializerProvider {
private MGraph mGraph;
private void initializeGraph() {
mGraph = new SimpleMGraph();
com.hp.hpl.jena.graph.Graph graph = new JenaGraph(mGraph);
Model model = ModelFactory.createModelForGraph(graph);
// create the resource
// and add the properties cascading style
String URI = "http://example.org/";
model.createResource(URI + "A").addProperty(
model.createProperty(URI + "B"), "C").addProperty(
model.createProperty(URI + "D"),
model.createResource().addProperty(
model.createProperty(URI + "E"), "F").addProperty(
model.createProperty(URI + "G"), "H"));
mGraph.add(new TripleImpl(new UriRef("http://foo/bar"),
new UriRef("http://foo/bar"),
LiteralFactory.getInstance().createTypedLiteral("foo")));
mGraph.add(new TripleImpl(new UriRef("http://foo/bar"),
new UriRef("http://foo/bar"),
LiteralFactory.getInstance().createTypedLiteral(54675)));
mGraph.add(new TripleImpl(new BNode(),
new UriRef("http://foo/bar"),
new UriRef("http://foo/bar")));
}
/*
* Serialize Graph to turtle format and deserialize.
*/
@Test
public void testTurtleSerializer() {
initializeGraph();
SerializingProvider provider = new JenaSerializerProvider();
ByteArrayOutputStream serializedGraph = new ByteArrayOutputStream();
provider.serialize(serializedGraph, mGraph.getGraph(),
"text/turtle");
InputStream in = new ByteArrayInputStream(serializedGraph.toByteArray());
Graph deserializedGraph = parse(in, "TURTLE");
// due to http://issues.trialox.org/jira/browse/RDF-6 we cannot just
// check
// that the two graphs are equals
Assert.assertEquals(deserializedGraph.size(), mGraph.getGraph().size());
Assert.assertEquals(deserializedGraph.hashCode(), mGraph.getGraph()
.hashCode());
// isomorphism delegated to jena
JenaGraph jenaGraphFromNTriples = new JenaGraph(deserializedGraph);
JenaGraph jenaGraphFromTurtle = new JenaGraph(mGraph.getGraph());
Assert.assertTrue(jenaGraphFromNTriples
.isIsomorphicWith(jenaGraphFromTurtle));
}
@Test
public void testTurtleSerializerWithParam() {
initializeGraph();
SerializingProvider provider = new JenaSerializerProvider();
ByteArrayOutputStream serializedGraph = new ByteArrayOutputStream();
provider.serialize(serializedGraph, mGraph.getGraph(),
"text/turtle;param=test");
InputStream in = new ByteArrayInputStream(serializedGraph.toByteArray());
Graph deserializedGraph = parse(in, "TURTLE");
Assert.assertEquals(mGraph.getGraph(), deserializedGraph);
}
/*
* Serialize Graph to rdf+xml format and deserialize.
*/
@Test
public void testRdfXmlSerializer() {
initializeGraph();
SerializingProvider provider = new JenaSerializerProvider();
ByteArrayOutputStream serializedGraph = new ByteArrayOutputStream();
provider.serialize(serializedGraph, mGraph.getGraph(),
"application/rdf+xml");
InputStream in = new ByteArrayInputStream(serializedGraph.toByteArray());
Graph deserializedGraph = parse(in, "RDF/XML-ABBREV");
Assert.assertEquals(mGraph.getGraph(), deserializedGraph);
}
/*
* Serialize Graph to rdf+nt format and deserialize.
*/
@Test
public void testRdfNtSerializer() {
initializeGraph();
SerializingProvider provider = new JenaSerializerProvider();
ByteArrayOutputStream serializedGraph = new ByteArrayOutputStream();
provider.serialize(serializedGraph, mGraph.getGraph(), "text/rdf+nt");
InputStream in = new ByteArrayInputStream(serializedGraph.toByteArray());
Graph deserializedGraph = parse(in, "N-TRIPLE");
Assert.assertEquals(mGraph.getGraph(), deserializedGraph);
}
/*
* Serialize Graph to rdf+n3 format and deserialize.
*/
@Test
public void testRdfN3Serializer() {
initializeGraph();
SerializingProvider provider = new JenaSerializerProvider();
ByteArrayOutputStream serializedGraph = new ByteArrayOutputStream();
provider.serialize(serializedGraph, mGraph.getGraph(), "text/rdf+n3");
InputStream in = new ByteArrayInputStream(serializedGraph.toByteArray());
Graph deserializedGraph = parse(in, "N3");
Assert.assertEquals(mGraph.getGraph(), deserializedGraph);
}
private Graph parse(InputStream serializedGraph, String jenaFormat) {
MGraph mResult = new SimpleMGraph();
com.hp.hpl.jena.graph.Graph graph = new JenaGraph(mResult);
Model model = ModelFactory.createModelForGraph(graph);
String base = "urn:x-relative:";
model.read(serializedGraph, base, jenaFormat);
return mResult.getGraph();
}
}