public void getNext(CAS aCAS) throws IOException, CollectionException {
    // TODO Auto-generated method stub
  
  JCas jcas;
  try {
    jcas = aCAS.getJCas();
  } catch (CASException e) {
    throw new CollectionException(e);
  }
  
  
  String file = sentences.get(mCurrentIndex++);
  jcas.setDocumentText(file);
  
 
  
 
  }