Cached mkdir -p in scala

CachedMkdir.scala

// Usage:
// val dircache = new CachedMkdir

// dircache.mkdirp("a/b/c/d/e") // creates the directory structure
// dircache.mkdirp("a/b/c/d/e") // does nothing
// dircache.mkdirp("a/b/Z/Y/Z") // only creates from b/ down
 
class CachedMkdir {

  var cache = Set[String]()

  def mkdirp(path: String) {
    var prepath = ""
    
    for(dir <- path.split("/")){
      prepath += (dir + "/")
      if(!cache.contains(prepath)){
        new java.io.File(prepath).mkdir()
        cache += prepath
      } 
    }
  }

}