omnics.constraint
Class ScalarProduct

java.lang.Object
  omnics.Constraint
      omnics.constraint.ScalarProduct

All Implemented Interfaces:

java.io.Serializable

public class ScalarProduct
extends Constraint

Implements the classic constraint: a1*x1 + a2*x2 + ... + ak*xk sum, where OP can be: =, ==, <, <=, >, >=, !=, <>

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

ScalarProduct(Var[] variables, int[] coeffs, int sum)
Creates a new instance of ScalarProduct

ScalarProduct(Var[] variables, int[] coeffs, int sum, java.lang.String operator)
Creates a new instance of ScalarProduct

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

ScalarProduct

public ScalarProduct(Var[] variables,
                     int[] coeffs,
                     int sum)

Creates a new instance of ScalarProduct

ScalarProduct

public ScalarProduct(Var[] variables,
                     int[] coeffs,
                     int sum,
                     java.lang.String operator)

Creates a new instance of ScalarProduct

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()

Returns a string representation of the constraint.

Overrides:

toString in class Constraint

Returns:

a string representation of the constraint