omnics.constraint
Class SumDiff

java.lang.Object
  omnics.Constraint
      omnics.constraint.SumDiff

All Implemented Interfaces:

java.io.Serializable

public class SumDiff
extends Constraint

Author:

Cristian Frasinaru

See Also:

Serialized Form

Field Summary

Fields inherited from class omnics.Constraint

ALLOWED, filter, FORBIDDEN, MAX, MIN, name, problem, variables

Constructor Summary

SumDiff(Var[] variables, int sum)
Creates a new instance of Sum

Method Summary

int	eval(Tuple tuple) Evaluates a tuple.
java.lang.String	toString() Returns a string representation of the constraint.

Methods inherited from class omnics.Constraint

eval, eval, getFilter, getName, getProblem, getTuples, getVarArray, getVariables, setFilter, setName, setVariables, setVariables, variable

Methods inherited from class java.lang.Object

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

Constructor Detail

SumDiff

public SumDiff(Var[] variables,
               int sum)

Creates a new instance of Sum

Method Detail

eval

public int eval(Tuple tuple)

Description copied from class: Constraint

Evaluates a tuple. The result of the evaluation could be:

MIN or ALLOWED: the tuple is good satisfies the constraint and can be part of a solution
• MAX or FORBIDDEN: the tuple is not good, cannot be part of a solution
• a value in the interval (MIN,MAX): a penalty implied by this tuple if it is used in a solution (in case of soft constraints)

Constants MIN, MAX, ALLOWED, FORBIDDEN are defined in ValuationStructure

Specified by:

eval in class Constraint

Parameters:

tuple - some tuple

Returns:

a value between ValuationStructure.MIN and ValuationStructure.MAX.

See Also:

Constraint.eval(Tuple), ValuationStructure

toString

public java.lang.String toString()

Description copied from class: Constraint

Returns a string representation of the constraint. It actually returns the name of the constraint. If the constraint has not been given an explicit name, it's name is: getClass().getName() + "(" + variables + ")"

Overrides:

toString in class Constraint

Returns:

a string representation of the constraint