opennlp.tools.sentdetect.SentenceSampleStream.java Source code

Introduction

Here is the source code for opennlp.tools.sentdetect.SentenceSampleStream.java

Source

/*
 * 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 <code>Reader</code> and converts them into {@link SentenceSample} objects.
 * An empty line indicates the begin of a new document.
 */
public class SentenceSampleStream extends FilterObjectStream<String, SentenceSample> {

    public SentenceSampleStream(ObjectStream<String> sentences) {
        super(new EmptyLinePreprocessorStream(sentences));
    }

    public static String replaceNewLineEscapeTags(String s) {
        return s.replace("<LF>", "\n").replace("<CR>", "\r");
    }

    public SentenceSample read() throws IOException {

        StringBuilder sentencesString = new StringBuilder();
        List<Span> 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;
    }
}