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Does NSFileWrapper implement a lazy read?

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Does NSFileWrapper implement a lazy read?

Subject: Does NSFileWrapper implement a lazy read?
From: Todd Heberlein <email@hidden>
Date: Thu, 12 Apr 2007 20:32:33 -0700

I have an NSDocument subclass that implements readFromFileWrapper:ofType:error: method. The document is a bundle document, and I expect one of the files in the directory to become very large (e.g., 1 Gig). Furthermore, I never need to read this entire file into memory (I scan it for certain information).

When readFromFileWrapper is called, does the NSFileWrapper that is passed in already have all the data from the bundle directory in memory (i.e., will that 1 Gig data file be in memory), or is it only read in when I pass the appropriate sub-NSFileWrapper the regularFileContents method? (which in the case of the large file, I will never do).

Thanks,

Todd

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