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// Turn the document contents into a single savable lump of data
- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError {
#pragma unused(typeName)
// Produce the data lump:
NSData * retval = [NSKeyedArchiver archivedDataWithRootObject:model];
// If the lump is nil something went wrong
// fill out the error object to explain what wrent wrong
if ( outError != NULL ) {
// The sender wanted an error reported. If there
// was a problem, fill in an NSError object
if (retval == nil) {
// The error object should include an (unhelpful)
// explanation of what happened
NSDictionary * userInfoDict = [NSDictionary dictionaryWithObjectsAndKeys:
@"Internal error formatting data", NSLocalizedDescriptionKey,
@"Archiving of data failed. Probably a bug.", NSLocalizedFailureReasonErrorKey,
@"There's nothing you can do.", NSLocalizedRecoverySuggestionErrorKey, nil];
*outError = [NSError errorWithDomain:LinearInternalErrorDomain
code:linErrCantFormatDocumentData
userInfo:userInfoDict];
} else {
// No problem. Don't supply an error object.
*outError = nil;
}
}
return retval;
}
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