/*
* 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 arq.examples.riot;
import java.util.concurrent.ExecutorService ;
import java.util.concurrent.Executors ;
import org.apache.jena.riot.RDFDataMgr ;
import org.apache.jena.riot.lang.PipedRDFIterator ;
import org.apache.jena.riot.lang.PipedRDFStream ;
import org.apache.jena.riot.lang.PipedTriplesStream ;
import com.hp.hpl.jena.graph.Triple ;
/**
* Example of using RIOT : iterate over output of parser run using a
* {@link PipedRDFStream} and a {@link PipedRDFIterator}
*
*/
public class ExRIOT_6 {
public static void main(String... argv) {
final String filename = "data.ttl";
// Create a PipedRDFStream to accept input and a PipedRDFIterator to
// consume it
// You can optionally supply a buffer size here for the
// PipedRDFIterator, see the documentation for details about recommended
// buffer sizes
PipedRDFIterator<Triple> iter = new PipedRDFIterator<Triple>();
final PipedRDFStream<Triple> inputStream = new PipedTriplesStream(iter);
// PipedRDFStream and PipedRDFIterator need to be on different threads
ExecutorService executor = Executors.newSingleThreadExecutor();
// Create a runnable for our parser thread
Runnable parser = new Runnable() {
@Override
public void run() {
// Call the parsing process.
RDFDataMgr.parse(inputStream, filename);
}
};
// Start the parser on another thread
executor.submit(parser);
// We will consume the input on the main thread here
// We can now iterate over data as it is parsed, parsing only runs as
// far ahead of our consumption as the buffer size allows
while (iter.hasNext()) {
Triple next = iter.next();
// Do something with each triple
}
}
}