opennlp.tools.ml.model.SequenceStreamEventStream Maven / Gradle / Ivy
/*
* 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 opennlp.tools.ml.model;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import opennlp.tools.util.ObjectStream;
/**
* Class which turns a sequence stream into an event stream.
*/
public class SequenceStreamEventStream implements ObjectStream {
private final SequenceStream sequenceStream;
private Iterator eventIt = Collections.emptyListIterator();
public SequenceStreamEventStream(SequenceStream sequenceStream) {
this.sequenceStream = sequenceStream;
}
@Override
public Event read() throws IOException {
while (!eventIt.hasNext()) {
Sequence sequence = sequenceStream.read();
if (sequence == null) {
return null;
}
eventIt = Arrays.asList(sequence.getEvents()).iterator();
}
return eventIt.next();
}
@Override
public void reset() throws IOException, UnsupportedOperationException {
eventIt = Collections.emptyListIterator();
sequenceStream.reset();
}
@Override
public void close() throws IOException {
eventIt = Collections.emptyListIterator();
sequenceStream.close();
}
}