CasSentenceSampleStream.java

/*
 * Copyright 2016
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universität Darmstadt
 *
 * Licensed 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 de.tudarmstadt.ukp.dkpro.core.opennlp.internal;

import static org.apache.uima.fit.util.JCasUtil.select;

import java.util.ArrayList;
import java.util.List;

import org.apache.uima.jcas.JCas;

import de.tudarmstadt.ukp.dkpro.core.api.segmentation.type.Sentence;
import opennlp.tools.sentdetect.SentenceSample;
import opennlp.tools.util.Span;

public class CasSentenceSampleStream
    extends CasSampleStreamBase<SentenceSample>
{
    private List<Span> sentences;
    private String text;
    
    @Override
    public void init(JCas aJCas)
    {
        text = aJCas.getDocumentText();
        sentences = new ArrayList<>();
        for (Sentence sent : select(aJCas, Sentence.class)) {
            Span s = new Span(sent.getBegin(), sent.getEnd());
            sentences.add(s);
        }
    }
    
    @Override
    public boolean isActive()
    {
        return sentences != null;
    }
    
    @Override
    public SentenceSample produce(JCas aJCas)
    {
        SentenceSample sample = new SentenceSample(text,
                sentences.toArray(new Span[sentences.size()]));
        
        documentComplete();
        sentences = null;
        text = null;
        
        return sample;
    }
}