public static cape.File forDirectory(cape.File dir, string extension = null)
{
var tmpdir = dir;
if (tmpdir == null)
{
tmpdir = cape.Environment.getTemporaryDirectory();
}
if (tmpdir == null || tmpdir.isDirectory() == false)
{
return(null);
}
cape.File v = null;
var n = 0;
var rnd = new cape.Random();
while (n < 100)
{
var id = "_tmp_" + cape.String.forInteger((int)cape.SystemClock.asSeconds()) + cape.String.forInteger((int)(rnd.nextInt() % 1000000));
if (object.Equals(extension, null) || cape.String.getLength(extension) < 1)
{
id = id + extension;
}
v = tmpdir.entry(id);
if (v.exists() == false)
{
v.touch();
break;
}
n++;
}
if (v != null && v.isFile() == false)
{
v = null;
}
return(v);
}