debug Vector private fields

repl.scala

Welcome to Scala version 2.9.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_31).
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scala> def vectorFields(vector:Vector[_]) = {
     |   val clazz = vector.getClass
     |   val fields = (0 to 5).map{n => clazz.getDeclaredField("display" + n)}
     |   fields.foreach{_.setAccessible(true)}
     |  
     |   val arrays = fields.map{_.get(vector)}
     | 
     |   (
     |     arrays(0).asInstanceOf[Array[_]],
     |     arrays(1).asInstanceOf[Array[Array[_]]],
     |     arrays(2).asInstanceOf[Array[Array[Array[_]]]],
     |     arrays(3).asInstanceOf[Array[Array[Array[Array[_]]]]],
     |     arrays(4).asInstanceOf[Array[Array[Array[Array[Array[_]]]]]],
     |     arrays(5).asInstanceOf[Array[Array[Array[Array[Array[Array[_]]]]]]]
     |   )
     | 
     | }
vectorFields: (vector: Vector[_])(Array[_$3], Array[Array[_]], Array[Array[Array[_]]], Array[Array[Array[Array[_]]]], Array[Array[Array[Array[Array[_]]]]], Array[Array[Array[Array[Array[Array[_]]]]]]) forSome { type _$3 }

scala> val v = (1 to 1000).toList.toIndexedSeq.asInstanceOf[Vector[_]]
v: scala.collection.immutable.Vector[Any] = Vector(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171,...

scala>  vectorFields(v)
res0: (Array[_$3], Array[Array[_]], Array[Array[Array[_]]], Array[Array[Array[Array[_]]]], Array[Array[Array[Array[Array[_]]]]], Array[Array[Array[Array[Array[Array[_]]]]]]) forSome { type _$3 } = (Array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32),Array(Array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32), Array(33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64), Array(65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96), Array(97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110,...

scala> vectorFields(v.take(100))
res1: (Array[_$3], Array[Array[_]], Array[Array[Array[_]]], Array[Array[Array[Array[_]]]], Array[Array[Array[Array[Array[_]]]]], Array[Array[Array[Array[Array[Array[_]]]]]]) forSome { type _$3 } = (Array(97, 98, 99, 100, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null),Array(Array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32), Array(33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64), Array(65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96), null, ...

scala> res0._1 eq res1._2(0)
res2: Boolean = true

vector.scala

def vectorFields(vector:Vector[_]) = {
  val clazz = vector.getClass
  val fields = (0 to 5).map{n => clazz.getDeclaredField("display" + n)}
  fields.foreach{_.setAccessible(true)}
  val arrays = fields.map{_.get(vector)}

  (
    arrays(0).asInstanceOf[Array[_]],
    arrays(1).asInstanceOf[Array[Array[_]]],
    arrays(2).asInstanceOf[Array[Array[Array[_]]]],
    arrays(3).asInstanceOf[Array[Array[Array[Array[_]]]]],
    arrays(4).asInstanceOf[Array[Array[Array[Array[Array[_]]]]]],
    arrays(5).asInstanceOf[Array[Array[Array[Array[Array[Array[_]]]]]]]
  )

}