public final CellName clusteringKey(Document document) {
        String string = document.get(FIELD_NAME);
        ByteBuffer bb = ByteBufferUtils.fromString(string);
        return cellNameType.cellFromByteBuffer(bb);
    }
public final CellName clusteringKey ( Document document ) { String string = document . get ( FIELD_NAME ) ; ByteBuffer bb = ByteBufferUtils . fromString ( string ) ; return cellNameType . cellFromByteBuffer ( bb ) ; }
Returns the clustering key contained in the specified {@link CellName}.

@param document A {@link Document}.
@return The clustering key contained in the specified {@link CellName}.