The Xcode "Spotlight importer" doesn't actually do anything. It
just says that certain files it cares about are text files.
That's all. The standard text file importer takes it from there.
Woah woah woah. I definitely remember:
On 2005-05-03, at 11:29, Eric Peyton wrote ("Re: Three Spotlight
importer questions"):
a crack at any give file. My test asserting some metadata for a
PDF file. And it worked fine. But the PDF importer never got to
run and that seems somehow inappropriate. Am I missing something
or is that the way it is right now?
That is the way that it is supposed to be. One file == one
importer. It would be a ridiculous situation performance wise if
more than one importer had to run for each file. I believe (I
could be wrong) that the intention is that the importers take
"ownership" of the data of the file type. So a pdf importer would
be the single place to go to find out information about pdf
files. Your intention to use a pdf importer to just add "more"
metadata is currently not supported in the system. Add your data
and the rest of the necessary data. I don't know of any way to
create a tree of importers for any single file.
So importers can call other importers? Or can importers only "re-
direct" to another importer, unable to extract any metadata
themselves? And in either case, how does Source Code.mdimporter do
this? I took only a brief look at it, and it seems that a UUID in
CFPlugInTypes is shared between Source Code and Rich Text (as well
as Mail, Image, and Audio, so I'm probably off).
Our importer simply opens the file (recognizing UTF-8 and UTF-16) and
uses the contents as the value for the kMDItemTextContent key. The
SpotLight internals know how to index that content.
So we're not violating any rules here. We just don't have to do much.
Dave
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