Java 类org.apache.lucene.index.CompositeReader 实例源码

@Override
public FunctionValues getValues(Map context, AtomicReaderContext readerContext) throws IOException {
  final IndexReader topReader = ReaderUtil.getTopLevelContext(readerContext).reader();
  final AtomicReader r = topReader instanceof CompositeReader 
      ? new SlowCompositeReaderWrapper((CompositeReader)topReader) 
      : (AtomicReader) topReader;
  final int off = readerContext.docBase;

  final SortedDocValues sindex = FieldCache.DEFAULT.getTermsIndex(r, field);
  final int end = sindex.getValueCount();

  return new IntDocValues(this) {
   @Override
    public int intVal(int doc) {
      return (end - sindex.getOrd(doc+off) - 1);
    }
  };
}