I would like to customize the way my NSDocument subclass saves files.
As best I can tell, the default behavior of NSDocument is to first
save the file to a temporary location (for me /private/tmp/XXX), then
copy the temporary file over the original. I assume this is done for
purposes of trying to keep operations atomic, or preventing data loss
in case of a network error for NFS (or something more cosmic I didn't
think of).
This behavior works well for small files, plists, or when the entire
data of the file is used or manipulated by the application. However,
I have written an editor for metadata in FLAC and Ogg Vorbis files.
These files are large, generally several MB, but the metadata is
typically only the first 8-10 KB. I would like to be able to do an
"in-place" save, modifying the original file versus being forced to
copy the original to the save destination, then modifying the copy,
which is then subsequently renamed. The performance hit for saving
an 18 MB FLAC file this way versus modifying the metadata in place is
simply enormous!
Which methods would I need to override to achieve this? I have tried
everything I can think of; I am able to modify the original file in
place (simply by using [self fileURL] as the path, but the save
operations are reported as failing to the user, since the temporary
file is not being created.
Thanks,
Stephen
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