/**
* Copyright 2012-2013 the Semargl contributors. See AUTHORS for more details.
*
* Licensed 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.semarglproject.jena.rdf.rdfa;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.RDFErrorHandler;
import com.hp.hpl.jena.rdf.model.RDFReader;
import com.hp.hpl.jena.rdf.model.impl.RDFReaderFImpl;
import org.semarglproject.jena.core.sink.JenaSink;
import org.semarglproject.source.StreamProcessor;
import org.semarglproject.rdf.ParseException;
import org.semarglproject.rdf.rdfa.RdfaParser;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
/**
* Implementation or Jena's RDFReader on top of Semargl APIs.
*/
public final class JenaRdfaReader implements RDFReader {
private final StreamProcessor streamProcessor;
/**
* Default constructor. Creates RDFa parser in 1.1 mode with disabled vocabulary expansion feature.
* Properties can be changed using {@link #setProperty(String, Object)} calls with property keys
* from {@link RdfaParser}.
*/
public JenaRdfaReader() {
streamProcessor = new StreamProcessor(RdfaParser.connect(JenaSink.connect(null)));
}
/**
* Injects information about Semargl RDFa parser to Jena framework.
*/
public static void inject() {
RDFReaderFImpl.setBaseReaderClassName("RDFA", JenaRdfaReader.class.getName());
}
@Override
public void read(Model model, Reader r, String base) {
streamProcessor.setProperty(JenaSink.OUTPUT_MODEL_PROPERTY, model);
try {
streamProcessor.process(r, base);
} catch (ParseException e) {
// do nothing
}
}
@Override
public void read(Model model, InputStream r, String base) {
boolean txSupported = model.supportsTransactions();
InputStreamReader reader = new InputStreamReader(r);
try {
if (txSupported) {
model.begin();
}
read(model, reader, base);
} finally {
if (txSupported) {
model.abort();
}
try {
reader.close();
} catch (IOException e) {
// do nothing
}
}
if (txSupported) {
model.commit();
}
}
@Override
public void read(Model model, String url) {
try {
URL uri = new URL(url);
read(model, uri.openStream(), url);
} catch (IOException e) {
// do nothing
}
}
@Override
public Object setProperty(String propName, Object propValue) {
return streamProcessor.setProperty(propName, propValue);
}
@Override
public RDFErrorHandler setErrorHandler(RDFErrorHandler errHandler) {
return null;
}
}