determines whether the document has been modified since the last call to storeToRecoveryFile.
If storeToRecoveryFile has not been called before, this method returns whether the document
has been modified since it has been loaded respectively created.
When saving a session, either in case of a emergency (when OpenOffice.org crashed), or during a
periodic session save as configured by the user, storeToRecoveryFile is called for every
document where wasModifiedSinceLastSave returns true.
It's allowed to implement this method sloppy, by returning true in cases where it is not sure whether
the document actually has been modified. So, the most simple implementation could simply delegate this call
to ::com::sun::star::util::XModifiable::isModified. (Well, actually that's the
second simple implementation, the most simple one would, still egitimately, always return true.)
However, in such a case, the document might be saved more often than needed. In particular during the
periodic session save, this might become a problem when saving is expensive, for a single document
or the sum of all open documents.
recovers the document after a previous emergency or session save.
The document itself has previously been created, but not loaded
(via ::com::sun::star::frame::XLoadable::load) or initialized (via
::com::sun::star::frame::XLoadable::initNew).
Upon successful return, the document must be fully initialized. In particular, the
caller is not responsible for calling ::com::sun::star::frame::XModel::attachResource.
Instead, the implementation is responsible to do so, if required.
A default implementation of this method could simply delegate this call to
::com::sun::star::frame:::XLodable::load, followed by
::com::sun::star::frame::XModel::attachResource.
Parameter SourceLocation
specifies the URL of the location to which the document was previously emergency-saved.
Parameter SalvagedFile
specifies the original URL of the file which had been emergency-saved. If this is empty,
then the file should be recovered from its original location.
Parameter MediaDescriptor
contains additional arguments for the load process, for instance an StatusIndicator.
