/* Create a view of a simple-array that is an affine index transform.
*/
public static Array shareArray(Array array, Array shape, Procedure proc) throws Throwable {
GeneralArray result = allocateArray(shape);
int rank = result.rank();
Object[] args = new Object[rank];
int[] dimensions = result.getDimensions();
int[] lowBounds = result.getLowBounds();
boolean empty = result.getSize() == 0;
for (int i = rank; --i >= 0; ) args[i] = Integer.valueOf(result.getLowBound(i));
int arank = array.rank();
int[] offsets = new int[rank];
int offset0;
if (empty) offset0 = 0;
else {
int[] work = new int[arank];
offset0 = effectiveIndex(array, proc, args, work);
for (int i = rank; --i >= 0; ) {
int size = dimensions[i];
int lo = lowBounds == null ? 0 : lowBounds[i];
if (size <= 1) offsets[i] = 0;
else {
Object low = args[i];
args[i] = IntNum.make(lo + 1);
offsets[i] = (effectiveIndex(array, proc, args, work) - offset0);
args[i] = low;
}
}
}
AVector base =
array instanceof GeneralArray ? ((GeneralArray) array).getBase() : (AVector) array;
result.setBase(base);
result.setStrides(offsets, offset0);
return result;
}
public static <E> Array<E> getTransformed(Array<E> base, Procedure transformer, Array shape) {
GeneralArray ashape = allocateArray(shape);
return new ProcTransformedArray(
base, transformer, ashape.getDimensions(), ashape.getLowBounds());
}
public static <E> Array<E> getBuiltArray(Array shape, Procedure procedure) {
GeneralArray ashape = allocateArray(shape);
return new BuiltArray(procedure, ashape.getDimensions(), ashape.getLowBounds());
}