PlayBook MANIFEST.MF interface

package {
    import flash.filesystem.File;
    import flash.filesystem.FileMode;
    import flash.filesystem.FileStream;

    import flash.utils.*;

    //-----------------------------------
    //
    public class AppUtil {

        private static var _instance:AppUtil;

        public static var date:String = '2011-07-19'; // hardcoded for now

        public static var name:String = 'ThisApp';

        public static var author:String = 'Author';

        public static var version:String = '0.0';


        //-----------------------------------
        //
        public function AppUtil() {
            if (AppUtil._instance)
                return;
            AppUtil._instance = this;

            // The alternative to this mess is to use File.userDirectory, but I don't consider
            // that guaranteed to always point to the parent of app/META-INF
            var manifest:File = new File(File.applicationDirectory.nativePath).resolvePath('../META-INF/MANIFEST.MF');

            var file:FileStream = new FileStream();
            file.open(manifest, FileMode.READ);
            var text:String = file.readUTFBytes(Math.min(manifest.size, 1000));

            var item:String;
            item = /Application-Version: (.+)/i.exec(text)[1];
            //~ trace('version', item, 'old', AppUtil.version);
            AppUtil.version = item;

            item = /Application-Name: (.+)/i.exec(text)[1];
            //~ trace('name', item, 'old', AppUtil.name);
            AppUtil.name = item;

            item = /Package-Author: (.+)/i.exec(text)[1];
            //~ trace('name', item, 'old', AppUtil.author);
            AppUtil.author = item;
        }


        //-----------------------------------
        //
        public static function initialize():AppUtil {
            return AppUtil._instance || new AppUtil();
        }
    }
}