src/Lucene.Net.Analysis.OpenNLP/Tools/NLPSentenceDetectorOp.cs

// Lucene version compatibility level 8.2.0
using opennlp.tools.sentdetect;
using opennlp.tools.util;

namespace Lucene.Net.Analysis.OpenNlp.Tools
{
    /*
     * 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.
     */

    /// <summary>
    /// Supply OpenNLP Sentence Detector tool.
    /// Requires binary models from OpenNLP project on SourceForge.
    /// </summary>
    public class NLPSentenceDetectorOp
    {
        private readonly SentenceDetectorME sentenceSplitter;

        public NLPSentenceDetectorOp(SentenceModel model)
        {
            sentenceSplitter = new SentenceDetectorME(model);
        }

        public NLPSentenceDetectorOp()
        {
            sentenceSplitter = null;
        }

        public virtual Span[] SplitSentences(string line)
        {
            lock (this)
            {
                if (sentenceSplitter != null)
                {
                    return sentenceSplitter.sentPosDetect(line);
                }
                else
                {
                    Span[] shorty = new Span[1];
                    shorty[0] = new Span(0, line.Length);
                    return shorty;
                }
            }
        }
    }
}