Hello devs
While building the PPTX according to your code in XSSF and XWPT, I
stumbled accross a problem with the recursive loading in the
POIXMLDocumentPart.
While Word and Spreadsheet do not have any loops in their relations,
Powerpoint defines a lot of vice-versa relationships. Example: the
SlideMaster has relations to its SlideLayouts, while the SlideLayouts
have a relation to their SlideMaster. The POIXMLDocument.read
implementation in beta6 says: go and load your stuff (with the factory),
then check your relations. If you have any, go down and load them too.
As PPTX defines SlideMaster and SlideLayout , which reference each
other, this ends up in a endless loop.
My proposal:
Let the POIXMLDocument manage the link between a PackagePart and its
POIXMLDocumentPart element. When reading the POIXMLDocument, traverse
the relations, but instatiate new POIXMLDocumentPart objects only once
per PackagePart. If it already available, do nothing and return the
object which is already linked to this PackagePart. As the
POIXMLDocument is on the same hierarchy as the OPCPackage, as it is the
single root element from that package. And the POIXMLDocumentParts are
on par with PackageParts, so the hierarchy maps and the object
lifecycles are congruent.
Hope I was able to describe the problem. :)
Kind regards,
Stefan Stern
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