java applet file assoc

assoc.bat

assoc .svg=SvgGraphicsFile
ftype SvgGraphicsFile=C:\Program Files\Internet Explorer\iexplore.exe "www.someplace.ru/index.html?file=" "%1"

extract.scala

// first, in our Applet class, we get the url, from which app was launched
val docBase = getDocumentBase()

// then, we parse it
object Loader {
  def load(documentBase: String): Boolean = {
    val pattern = "file="
    val i = documentBase.indexOf(pattern)
    if (i > 0) {
      val f = decode(documentBase.drop(i + pattern.size).stripPrefix("\"%20\""))
      println("loading file: %s" format f)
      // load your file
      true
    } else false
  }
  def decode(l: String): String = {
    var a = l.getBytes
    var i = a.indexOf(37)
    while (i != -1) {
      val x = List(a(i+1).toChar,a(i+2).toChar).mkString
      val p = List(int2ubyte(java.lang.Integer.parseInt(x,16)))
      a = patch(a, i, p, 3)
      i = a.indexOf(37)
    }
    new String(a)
  }
  /** Because default Seq's patch method hangs Proguard. And I do not know why. */
  def patch[A : Manifest](s:Array[A], from: Int, patch: Seq[A], replaced: Int): Array[A] = {
    (s.take(from) ++ patch ++ s.drop(from + replaced)).toArray
  }
  def int2ubyte(i:Int) = if (i > 127) (i - 256).toByte else i.toByte
}