opennlp.tools.formats.masc.MascSentenceSampleStream 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.formats.masc;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import opennlp.tools.sentdetect.SentenceSample;
import opennlp.tools.util.FilterObjectStream;
import opennlp.tools.util.ObjectStream;
import opennlp.tools.util.Span;
public class MascSentenceSampleStream extends FilterObjectStream {
private final int sentencesPerSample;
private MascDocument buffer;
public MascSentenceSampleStream(ObjectStream samples, int sentencesPerSample)
throws IOException {
super(samples);
this.sentencesPerSample = sentencesPerSample;
buffer = samples.read();
}
/**
* Reads a new {@link SentenceSample sample of sentences}.
*
* @return The {@link SentenceSample specified number of sentences}.
* If fewer left, then return whatever is left.
*
* @throws IOException Thrown if IO errors occurred during read operation.
*/
@Override
public SentenceSample read() throws IOException {
try {
StringBuilder documentText = new StringBuilder();
List sentenceSpans = new ArrayList<>();
for (int i = 0; i < sentencesPerSample; i++) {
MascSentence sentence = buffer.read();
if (sentence != null) {
// Current document still has sentences
int startIndex = documentText.length();
documentText.append(sentence.getSentDetectText()).append(' ');
sentenceSpans.add(new Span(startIndex, documentText.length() - 1));
} else if ((buffer = samples.read()) != null) {
documentText.append('\n');
// Current document exhausted, but we can still move on to the next one
i--; // This round does not count
} else {
// We exhausted all sentences in all documents
break;
}
}
if (documentText.length() > 0) {
documentText.setLength(documentText.length() - 1);
return new SentenceSample(documentText,
sentenceSpans.toArray(new Span[0]));
}
return null;
} catch (IOException e) {
throw new IOException("You are reading an empty document stream. " +
"Did you close it?");
}
}
@Override
public void reset() throws IOException, UnsupportedOperationException {
samples.reset();
buffer = samples.read();
}
}