property |NSURL| : a reference to current application’s |NSURL|
property NSArray : a reference to current application’s NSArray
property NSString : a reference to current application’s NSString
property NSPredicate : a reference to current application’s NSPredicate
property NSFileManager : a reference to current application’s NSFileManager
property NSURLTypeIdentifierKey : a reference to current application’s NSURLTypeIdentifierKey

set targDegree to 90 — targDegree have to be in {0, 90, 180, 270, 360} in clockwise

tell application "Finder"
　　set inFiles to selection as alias list
end tell
if inFiles = {} then return

–指定のAlias listのうち画像のみ抽出
set filRes1 to filterAliasListByUTI(inFiles, "public.image") of me
if filRes1 = {} then return

–選択中のファイルのうちの１つから親フォルダを求め、出力先ファイルパスを組み立てる
set outPathTarg to POSIX path of (first item of filRes1)
set pathString to current application’s NSString’s stringWithString:outPathTarg
set newPath to (pathString’s stringByDeletingLastPathComponent()) as string

repeat with i in filRes1
　　rotateImageandSaveIt(i, targDegree) of me
end repeat

–指定角度に画像を回転させて上書き保存
on rotateImageandSaveIt(this_file, aTargerRect)
　　tell application "Image Events"
　　　　launch
　　　　set this_image to open this_file
　　　　rotate this_image to angle aTargerRect
　　　　save this_image with icon
　　　　close this_image
　　end tell
end rotateImageandSaveIt

–Alias listから指定UTIに含まれるものをPOSIX pathのリストで返す
on filterAliasListByUTI(aList, targUTI)
　　set newList to {}
　　repeat with i in aList
　　　　set j to POSIX path of i
　　　　set tmpUTI to my retUTIfromPath(j)
　　　　set utiRes to my filterUTIList({tmpUTI}, targUTI)
　　　　if utiRes is not equal to {} then
　　　　　　set the end of newList to j
　　　　end if
　　end repeat
　　return newList
end filterAliasListByUTI

–指定のPOSIX pathのファイルのUTIを求める
on retUTIfromPath(aPOSIXPath)
　　set aURL to |NSURL|’s fileURLWithPath:aPOSIXPath
　　set {theResult, theValue} to aURL’s getResourceValue:(reference) forKey:NSURLTypeIdentifierKey |error|:(missing value)
　　
　　if theResult = true then
　　　　return theValue as string
　　else
　　　　return theResult
　　end if
end retUTIfromPath

–UTIリストが指定UTIに含まれているかどうか演算を行う
on filterUTIList(aUTIList, aUTIstr)
　　set anArray to NSArray’s arrayWithArray:aUTIList
　　set aPred to NSPredicate’s predicateWithFormat_("SELF UTI-CONFORMS-TO %@", aUTIstr)
　　set bRes to (anArray’s filteredArrayUsingPredicate:aPred) as list
　　return bRes
end filterUTIList