opennlp.tools.chunker.ChunkSampleStream 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.chunker;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import opennlp.tools.util.FilterObjectStream;
import opennlp.tools.util.ObjectStream;
/**
* Parses the conll 2000 shared task shallow parser training data.
*
* Data format is specified on the conll page:
*
* http://www.cnts.ua.ac.be/conll2000/chunking/
*/
public class ChunkSampleStream extends FilterObjectStream {
private static final Logger logger = LoggerFactory.getLogger(ChunkSampleStream.class);
/**
* Initializes a {@link ChunkSampleStream instance}.
*
* @param samples A plain text {@link ObjectStream line stream}.
*/
public ChunkSampleStream(ObjectStream samples) {
super(samples);
}
@Override
public ChunkSample read() throws IOException {
List toks = new ArrayList<>();
List tags = new ArrayList<>();
List preds = new ArrayList<>();
for (String line = samples.read(); line != null && !line.isEmpty(); line = samples.read()) {
String[] parts = line.split(" ");
if (parts.length != 3) {
logger.error("Skipping corrupt line: {}", line);
}
else {
toks.add(parts[0]);
tags.add(parts[1]);
preds.add(parts[2]);
}
}
if (toks.size() > 0) {
return new ChunkSample(toks.toArray(new String[0]),
tags.toArray(new String[0]), preds.toArray(new String[0]));
}
return null;
}
}