mondrian.rolap
Interface Modulos

All Known Implementing Classes:

Modulos.Base, Modulos.Many, Modulos.One, Modulos.Three, Modulos.Two, Modulos.Zero

public interface Modulos

Modulos implementations encapsulate algorithms to map between integral ordinals and position arrays. There are particular implementations for the most likely cases where the number of axes is 1, 2 and 3 as well as a general implementation.

Suppose the result is 4 x 3 x 2, then modulo = {1, 4, 12, 24}.

Then the ordinal of cell (3, 2, 1)

  = (modulo[0] * 3) + (modulo[1] * 2) + (modulo[2] * 1)
  = (1 * 3) + (4 * 2) + (12 * 1)
  = 23
 

Reverse calculation:

 p[0] = (23 % modulo[1]) / modulo[0] = (23 % 4) / 1 = 3
 p[1] = (23 % modulo[2]) / modulo[1] = (23 % 12) / 4 = 2
 p[2] = (23 % modulo[3]) / modulo[2] = (23 % 24) / 12 = 1
 

Author:

jhyde

Nested Class Summary

static class	Modulos.Base
static class	Modulos.Generator
static class	Modulos.Many
static class	Modulos.One
static class	Modulos.Three
static class	Modulos.Two
static class	Modulos.Zero

Method Summary

int	getCellOrdinal(int[] pos) Converts a set of cell coordinates to a cell ordinal.
int[]	getCellPos(int cellOrdinal) Converts a cell ordinal to a set of cell coordinates.

Method Detail

getCellPos

int[] getCellPos(int cellOrdinal)

Converts a cell ordinal to a set of cell coordinates. Converse of getCellOrdinal(int[]). For example, if this result is 10 x 10 x 10, then cell ordinal 537 has coordinates (5, 3, 7).

Parameters:

cellOrdinal - Cell ordinal

Returns:

cell coordinates

getCellOrdinal

int getCellOrdinal(int[] pos)

Converts a set of cell coordinates to a cell ordinal. Converse of getCellPos(int).

Parameters:

pos - Cell coordinates

Returns:

cell ordinal