Objective C option parameter problem

Scripting Forums AppleScriptObjC and Xcode
#1

While exploring Applescript Objective C (thanks Shane Stanley), I have found that a large number of Objective C methods have an option parameter. I have no problem supplying one of the option constants, but have been unable to find a way of doing a bitwise OR with multiple constants using applescript.

Does anyone know a way to do this?

Example handler:

on replaceItemAtPath:psxDestPathString withItemAtURL:psxSrcPathString
	-- This handler moves Src contents, replacing Dest contents, keeping Dest name, with backup of Dest. Src path is destroyed.
	
	-- uses the following convenience properties
	-- property thisapp : current application
	-- property NSString : class "NSString"
	-- property NSURL : class "NSURL"
	-- property NSFileManager : class "NSFileManager"

	-- References
	-- NSFileManager instance method
	-- - replaceItemAtURL:withItemAtURL:backupItemName:options:resultingItemURL:error:
	-- NSURL class method
	-- + (NSURL *)fileURLWithPath:(NSString *)path
	
	-- Shove all the pieces into obj-C scope
	set buNameString to (NSString's stringWithString:"Backup.bu")
	set psxDestPathString to (NSString's stringWithString:psxDestPathString)
	set psxSrcPathString to (NSString's stringWithString:psxSrcPathString)
	
	-- Expand paths
	set psxDestPathString to (psxDestPathString's stringByExpandingTildeInPath)
	set psxSrcPathString to (psxSrcPathString's stringByExpandingTildeInPath)
	
	-- Convert NSStrings to NSURLs
	set psxDestPathURL to NSURL's fileURLWithPath:psxDestPathString
	set psxSrcPathURL to NSURL's fileURLWithPath:psxSrcPathString
	
	-- option 1: thisapp's NSFileManagerItemReplacementUsingNewMetadataOnly
	-- option 2: thisapp's NSFileManagerItemReplacementWithoutDeletingBackupItem

	-- Can't figure this out: set bitwiseORComponents to (option 1 | option 2) <------------------------------<<

	-- works fine with one constant
	set replaceOptions to thisapp's NSFileManagerItemReplacementWithoutDeletingBackupItem

	set response to (NSFileManager's defaultManager's replaceItemAtURL:psxDestPathURL withItemAtURL:psxSrcPathURL backupItemName:buNameString options:replaceOptions resultingItemURL:psxDestPathURL |error|:(missing value))
	return response
end replaceItemAtPath:withItemAtURL:
#2

Hi,

these option constants are just integer values,

NSFileManagerItemReplacementUsingNewMetadataOnly is 1
NSFileManagerItemReplacementWithoutDeletingBackupItem is 2

So simply add them

set replaceOptions to (thisapp's  NSFileManagerItemReplacementUsingNewMetadataOnly as integer) + (thisapp's  NSFileManagerItemReplacementWithoutDeletingBackupItem as integer)

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#3

Thanks, Stefan.

I was trying to make it more difficult than necessary.
I realize now that options in objective c methods are simple enumerations which are bit masks with each enumeration shifted left bitwise.

Regards