[Nepomuk] Review Request: Virtuoso Backend: Make empty graph support optional

[Vishesh Handa]

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This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/106520/
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Review request for Nepomuk, Soprano and Sebastian Trueg.


Description
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    Virtuoso doesn't support empty graphs, so we use a fake graph which acts
    as the default empty graph.
    
    This approach, while useful, does have a performance impact, as the
    graph needs to be regularly checked agains't this default graph.
    
    Therefore, we add an option to disable this feature. By default, this
    feature is enabled in order to preserve compatibility.


Diffs
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  backends/virtuoso/virtuosobackend.cpp ca5070f 
  backends/virtuoso/virtuosomodel.h b5fa1f8 
  backends/virtuoso/virtuosomodel.cpp 2bc6fe2 
  backends/virtuoso/virtuosomodel_p.h af58d12 
  backends/virtuoso/virtuosoqueryresultiteratorbackend.cpp 914a320 

Diff: http://git.reviewboard.kde.org/r/106520/diff/


Testing
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Thanks,

Vishesh Handa

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