public Object getOpenContainer() {
        return openContainer;
    }
Returns the open container object if any, such as a
POIFS FileSystem in the event of an OLE2 document
being detected and processed by the OLE2 detector.

@return Open Container for this stream, or <code>null</code> if none
tika-core/src/main/java/org/apache/tika/io/TikaInputStream.java