/*
* 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.hadoop.rdf.io.input.util;
import java.util.LinkedList;
import java.util.Queue;
import org.apache.jena.riot.lang.PipedRDFIterator;
import org.apache.jena.riot.lang.PipedRDFStream;
/**
* A tracked piped RDF stream
*
*
*
* @param <T>
* Type corresponding to a supported RDF primitive
*/
public abstract class TrackedPipedRDFStream<T> extends PipedRDFStream<T> {
private TrackableInputStream input;
private Queue<Long> positions = new LinkedList<Long>();
protected TrackedPipedRDFStream(PipedRDFIterator<T> sink, TrackableInputStream input) {
super(sink);
this.input = input;
}
@Override
protected void receive(T t) {
// Track positions the input stream is at as we receive inputs
synchronized (this.positions) {
this.positions.add(this.input.getBytesRead());
}
super.receive(t);
}
/**
* Gets the next position
*
* @return Position
*/
public Long getPosition() {
synchronized (this.positions) {
return this.positions.poll();
}
}
}