org.jacop.constraints.geost

Class ShiftOrder

java.lang.Object

org.jacop.constraints.geost.ShiftOrder

All Implemented Interfaces:

LexicographicalOrder

public class ShiftOrder
extends Object
implements LexicographicalOrder

Author:

Marc-Olivier Fleury and Radoslaw Szymanek It provides a very simple lexicographical order based on the dimension ordering, with the possibility to choose the most significant dimension

Constructor Summary

Constructors

Constructor and Description
ShiftOrder(int dimensions, int mostSignificant) It creates a lexicographical order with the possibility to shift the order according to the most significant dimension.

Method Summary

Modifier and Type	Method and Description
String	checkInvariants() It checks that this order has consistent data structures.
int	compare(int[] p1, int[] p2) It compares two k-dimensional points.
int	dimensionAt(int precedenceLevel) It provides the dimension corresponding to the given precedence level
int	getMostSignificantDimension() This is equivalent to the call precedenceOf(0).
int[]	masterOrdering() It returns the ordering of dimensions used when no shift is applied (i.e.
int	precedenceOf(int dimension) It provides the precedence level of the given dimension.
void	setMostSignificantDimension(int dimension) It shifts the lexicographical order so that the most significant dimension is set to d.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ShiftOrder

public ShiftOrder(int dimensions,
                  int mostSignificant)

It creates a lexicographical order with the possibility to shift the order according to the most significant dimension.

Parameters:

dimensions - number of dimensions.

mostSignificant - the position of the most significant dimension.

Method Detail

checkInvariants

public String checkInvariants()

It checks that this order has consistent data structures.

Returns:

a string describing the consistency problem with data structures, null if no problem encountered.

compare

public int compare(int[] p1,
                   int[] p2)

Description copied from interface: LexicographicalOrder

It compares two k-dimensional points.

Specified by:

compare in interface LexicographicalOrder

Returns:

comparison result: a negative value if p1 is smaller than p2, 0 if p1 is equal to p2, and a positive value if p1 is larger than p2.

dimensionAt

public int dimensionAt(int precedenceLevel)

Description copied from interface: LexicographicalOrder

It provides the dimension corresponding to the given precedence level

Specified by:

dimensionAt in interface LexicographicalOrder

Returns:

an integer value of the dimension.

precedenceOf

public int precedenceOf(int dimension)

Description copied from interface: LexicographicalOrder

It provides the precedence level of the given dimension. 0 is the most significant.

Specified by:

precedenceOf in interface LexicographicalOrder

Returns:

integer value of the precedence level.

setMostSignificantDimension

public void setMostSignificantDimension(int dimension)

Description copied from interface: LexicographicalOrder

It shifts the lexicographical order so that the most significant dimension is set to d.

Specified by:

setMostSignificantDimension in interface LexicographicalOrder

Parameters:

dimension - the dimension to be considered most significant

getMostSignificantDimension

public int getMostSignificantDimension()

Description copied from interface: LexicographicalOrder

This is equivalent to the call precedenceOf(0).

Specified by:

getMostSignificantDimension in interface LexicographicalOrder

Returns:

the most significant dimension

masterOrdering

public int[] masterOrdering()

Description copied from interface: LexicographicalOrder

It returns the ordering of dimensions used when no shift is applied (i.e. when the most significant dimension is not changed)

Specified by:

masterOrdering in interface LexicographicalOrder

Returns:

the ordering of dimensions without a shift.