Module org.maxicp

Package org.maxicp.cp.engine.constraints

Class Among

java.lang.Object

org.maxicp.cp.engine.core.AbstractCPConstraint

org.maxicp.cp.engine.constraints.Among

All Implemented Interfaces:

CPConstraint, ConcreteConstraint<ConcreteCPModel>

public class Among
extends AbstractCPConstraint

Among constraint.

Enforces that the number of variables in x that take a value in a given set vals is equal to N.

Constructor Summary

Constructors

Constructor	Description
Among(CPIntVar[] x, Set<Integer> vals, CPIntVar N)	Creates an Among constraint enforcing that N variables in x take their value in vals.

Method Summary

Modifier and Type	Method	Description
protected int	interSize(CPIntVar var)
void	post()	Initializes the constraint when it is posted to the solver.
void	propagate()	Propagates the constraint.

Methods inherited from class org.maxicp.cp.engine.core.AbstractCPConstraint

getSolver, isActive, isScheduled, priority, registerDelta, setActive, setScheduled, updateDeltas

Methods inherited from class java.lang.Object

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

Constructor Details

Among

public Among(CPIntVar[] x,
 Set<Integer> vals,
 CPIntVar N)

Creates an Among constraint enforcing that N variables in x take their value in vals.

Parameters:

x - the array of decision variables

vals - the set of target values to count

N - the variable representing the number of variables in x taking a value in vals

Method Details

interSize

protected int interSize(CPIntVar var)

Parameters:

var - the variable

Returns:

the number of value in the domain of a var that are included in vals

post

public void post()

Description copied from interface: CPConstraint

Initializes the constraint when it is posted to the solver.

Specified by:

post in interface CPConstraint

Overrides:

post in class AbstractCPConstraint

propagate

public void propagate()

Description copied from interface: CPConstraint

Propagates the constraint.

Specified by:

propagate in interface CPConstraint

Overrides:

propagate in class AbstractCPConstraint