opennlp.tools.ml.maxent.RealBasicEventStream 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.maxent;
import java.io.IOException;
import opennlp.tools.ml.model.Event;
import opennlp.tools.ml.model.RealValueFileEventStream;
import opennlp.tools.util.ObjectStream;
/**
* Class for real-valued {@link Event events} as an
* {@link ObjectStream event stream}.
* .
* @see Event
* @see ObjectStream
*/
public class RealBasicEventStream implements ObjectStream {
private final ObjectStream ds;
public RealBasicEventStream(ObjectStream ds) {
this.ds = ds;
}
/**
* {@inheritDoc}
*
* @throws IOException Thrown if there is an error during reading.
* @throws RuntimeException Thrown if negative real values are detected in the input data.
*/
@Override
public Event read() throws IOException {
String eventString = ds.read();
if (eventString != null) {
return createEvent(eventString);
}
return null;
}
private Event createEvent(String obs) {
int si = obs.indexOf(' ');
if (si == -1)
return null;
else {
String outcome = obs.substring(0, si);
String[] contexts = obs.substring(si + 1).split("\\s+");
float[] values = RealValueFileEventStream.parseContexts(contexts);
return new Event(outcome,contexts,values);
}
}
@Override
public void reset() throws IOException, UnsupportedOperationException {
ds.reset();
}
@Override
public void close() throws IOException {
ds.close();
}
}