On Aug 12, 2009, at 10:23 AM, Igor Peshansky wrote:
> But you could provide your own implementation of Marshal[Double]
> that reads bytes in whatever order you wish. For example:
>
> class LSB {
> public static class MyDoubleMarshal implements Marshal[Double] {
> public def read(r: Reader): Double throws IOException {
> var l: Long = 0l;
> for (var shift: Int = 0; shift < 64; shift+=8) {
> val b : Long = r.read();
> l |= (b & 0xff) << shift;
> }
> return Double.fromLongBits(l);
> }
>
> public def write(w: Writer, d: Double): Void throws
> IOException {
> val l: Long = d.toLongBits();
> for (var shift: Int = 0; shift < 64; shift+=8) {
> val b = ((l >>> shift) & 0xffL) as Byte;
> w.write(b);
> }
> }
> }
> const DOUBLE = new MyDoubleMarshal();
> }
>
> You can then use the above as follows:
>
> val r: Reader = ...;
> val d: Double = r.read(LSB.DOUBLE);
>
> or even
>
> val da = Rail.makeVar[Double](100);
> r.read(LSB.DOUBLE, da);
>
> to read an array of 100 doubles in LSB format.
This array is really a Rail (local). Given no apparent method for
reading an Array[Double], can I read multiple Rail[Double] multiple
time and assign each to a row in the Array[Double]? Otherwise it
appears I would have to read each byte individually.
Jim
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