opennlp.tools.sentdetect.SentenceSampleStream 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.sentdetect;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import opennlp.tools.util.FilterObjectStream;
import opennlp.tools.util.ObjectStream;
import opennlp.tools.util.Span;
/**
* This class is a stream filter which reads a sentence by line samples from
* a Reader and converts them into {@link SentenceSample} objects.
* An empty line indicates the begin of a new document.
*/
public class SentenceSampleStream extends FilterObjectStream {
public SentenceSampleStream(ObjectStream sentences) {
super(new EmptyLinePreprocessorStream(sentences));
}
public static String replaceNewLineEscapeTags(String s) {
return s.replace("", "\n").replace("", "\r");
}
public SentenceSample read() throws IOException {
StringBuilder sentencesString = new StringBuilder();
List sentenceSpans = new LinkedList<>();
String sentence;
while ((sentence = samples.read()) != null && !sentence.equals("")) {
int begin = sentencesString.length();
sentence = sentence.trim();
sentence = replaceNewLineEscapeTags(sentence);
sentencesString.append(sentence);
int end = sentencesString.length();
sentenceSpans.add(new Span(begin, end));
sentencesString.append(' ');
}
if (sentenceSpans.size() > 0) {
return new SentenceSample(sentencesString.toString(),
sentenceSpans.toArray(new Span[sentenceSpans.size()]));
}
return null;
}
}