org.jacop.constraints

Class Stretch

java.lang.Object

org.jacop.constraints.DecomposedConstraint

org.jacop.constraints.Stretch

public class Stretch
extends DecomposedConstraint

It constructs a Stretch constraint based on Regular constraint. An example of a Stretch constraint is values = [1, 2], min = [1, 2], max = [2, 3], and x = [x1, x2, x3, x4]. It specifies that variables x are equal to value 1 and 2, and any sequence of values 1 has to be of length between 1 and 2, and any sequence of values 2 has to be of length between 2 and 3.

Version:

4.2

Author:

Radoslaw Szymanek and Polina Makeeva

Field Summary

Fields inherited from class org.jacop.constraints.DecomposedConstraint

queueIndex

Constructor Summary

Constructors

Constructor and Description
Stretch(int[] values, int[] min, int[] max, IntVar[] x) It creates a Stretch constraint.

Method Summary

Modifier and Type	Method and Description
ArrayList<Constraint>	decompose(Store store) It returns an array list of constraint which are used to decompose this constraint.
void	imposeDecomposition(Store store) It imposes the constraint in a given store.

Methods inherited from class org.jacop.constraints.DecomposedConstraint

auxiliaryVariables, derivative, imposeDecomposition

Methods inherited from class java.lang.Object

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

Constructor Detail

Stretch

public Stretch(int[] values,
               int[] min,
               int[] max,
               IntVar[] x)

It creates a Stretch constraint.

Parameters:

values - a list of values which can be taken by variables.

min - the minimal sequence length for each value.

max - the maximal sequence length for each value.

x - variables which assignment is constrained by Stretch constraint.

Method Detail

imposeDecomposition

public void imposeDecomposition(Store store)

Description copied from class: DecomposedConstraint

It imposes the constraint in a given store.

Specified by:

imposeDecomposition in class DecomposedConstraint

Parameters:

store - the constraint store to which the constraint is imposed to.

decompose

public ArrayList<Constraint> decompose(Store store)

Description copied from class: DecomposedConstraint

It returns an array list of constraint which are used to decompose this constraint. It actually creates a decomposition (possibly also creating variables), but it does not impose the constraint.

Specified by:

decompose in class DecomposedConstraint

Parameters:

store - the constraint store in which context the decomposition takes place.

Returns:

an array list of constraints used to decompose this constraint.