net.sf.cpsolver.exam.criteria

Class StudentDistanceBackToBackConflicts

java.lang.Object

net.sf.cpsolver.ifs.criteria.AbstractCriterion<Exam,ExamPlacement>

net.sf.cpsolver.exam.criteria.ExamCriterion

net.sf.cpsolver.exam.criteria.StudentDistanceBackToBackConflicts

All Implemented Interfaces:

Criterion<Exam,ExamPlacement>, InfoProvider<Exam>, ModelListener<Exam,ExamPlacement>

Direct Known Subclasses:

InstructorDistanceBackToBackConflicts

public class StudentDistanceBackToBackConflicts
extends ExamCriterion

Number of back-to-back distance student conflicts. I.e., number of cases when an exam is attended by a student that attends some other exam at the previous ExamPeriod.prev() or following ExamPeriod.next() period and the distance ExamPlacement.getDistanceInMeters(ExamPlacement) between these two exams is greater than ExamModel.getBackToBackDistance(). Distance back-to-back conflicts are only considered between consecutive periods that are of the same day.

Distance back-to-back student conflict weight can be set by problem property Exams.DistanceBackToBackConflictWeight, or in the input xml file, property distanceBackToBackConflictWeight.

Version:

ExamTT 1.2 (Examination Timetabling)
Copyright (C) 2008 - 2012 Tomáš Müller
muller@unitime.org
http://muller.unitime.org

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not see http://www.gnu.org/licenses/.

Nested Class Summary

Nested classes/interfaces inherited from class net.sf.cpsolver.ifs.criteria.AbstractCriterion

AbstractCriterion.ValueUpdateType

Field Summary

Fields inherited from class net.sf.cpsolver.ifs.criteria.AbstractCriterion

iBest, iDebug, iValue, iValueUpdateType, iWeight, sDoubleFormat, sPercentFormat

Constructor Summary

Constructors

Constructor and Description
StudentDistanceBackToBackConflicts()

Method Summary

Modifier and Type	Method and Description
double	getBackToBackDistance() Back-to-back distance.
void	getInfo(Map<String,String> info) Adds some information into the table with information about the solution
String	getName() Criterion name
double	getValue(ExamPlacement value, Set<ExamPlacement> conflicts) Value of a proposed assignment (including hard conflicts)
double	getWeightDefault(DataProperties config) Defines default weight (when AbstractCriterion.getWeightName() parameter is not present in the criterion).
String	getWeightName() Defines weight name (to be used to get the criterion weight from the configuration).
void	getXmlParameters(Map<String,String> params) Put all the parameters of this criterion into a map that is used to write parameters section of the examination XML file.
String	getXmlWeightName() Name of the weight parameter in the parameters section of the examination XML file.
boolean	init(Solver<Exam,ExamPlacement> solver) Notification that the model was initialized by the solver.
boolean	isPeriodCriterion() True if this criterion is based on period assignment.
void	setBackToBackDistance(double backToBackDistance) Back-to-back distance.
void	setXmlParameters(Map<String,String> params) Set all the parameters of this criterion from a map that is read from the parameters section the examination XML file.
String	toString()

Methods inherited from class net.sf.cpsolver.exam.criteria.ExamCriterion

getBounds, getPeriodValue, getRoomValue, isRoomCriterion, setWeight

Methods inherited from class net.sf.cpsolver.ifs.criteria.AbstractCriterion

afterAssigned, afterUnassigned, beforeAssigned, beforeUnassigned, bestRestored, bestSaved, clearCache, computeBounds, constraintAdded, constraintRemoved, getBest, getBounds, getInfo, getModel, getPerc, getPercRev, getValue, getValue, getWeight, getWeightedBest, getWeightedValue, getWeightedValue, getWeightedValue, inc, variableAdded, variableRemoved

Methods inherited from class java.lang.Object

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

Constructor Detail

StudentDistanceBackToBackConflicts

public StudentDistanceBackToBackConflicts()

Method Detail

init

public boolean init(Solver<Exam,ExamPlacement> solver)

Description copied from interface: ModelListener

Notification that the model was initialized by the solver.

Specified by:

init in interface ModelListener<Exam,ExamPlacement>

Overrides:

init in class AbstractCriterion<Exam,ExamPlacement>

Parameters:

solver - IFS solver

getWeightName

public String getWeightName()

Description copied from class: AbstractCriterion

Defines weight name (to be used to get the criterion weight from the configuration).

Overrides:

getWeightName in class ExamCriterion

getXmlWeightName

public String getXmlWeightName()

Description copied from class: ExamCriterion

Name of the weight parameter in the parameters section of the examination XML file.

Overrides:

getXmlWeightName in class ExamCriterion

getWeightDefault

public double getWeightDefault(DataProperties config)

Description copied from class: AbstractCriterion

Defines default weight (when AbstractCriterion.getWeightName() parameter is not present in the criterion).

Overrides:

getWeightDefault in class AbstractCriterion<Exam,ExamPlacement>

getBackToBackDistance

public double getBackToBackDistance()

Back-to-back distance. Can be set by problem property Exams.BackToBackDistance, or in the input xml file, property backToBackDistance)

setBackToBackDistance

public void setBackToBackDistance(double backToBackDistance)

Back-to-back distance. Can be set by problem property Exams.BackToBackDistance, or in the input xml file, property backToBackDistance)

getXmlParameters

public void getXmlParameters(Map<String,String> params)

Description copied from class: ExamCriterion

Put all the parameters of this criterion into a map that is used to write parameters section of the examination XML file.

Overrides:

getXmlParameters in class ExamCriterion

setXmlParameters

public void setXmlParameters(Map<String,String> params)

Description copied from class: ExamCriterion

Set all the parameters of this criterion from a map that is read from the parameters section the examination XML file.

Overrides:

setXmlParameters in class ExamCriterion

getValue

public double getValue(ExamPlacement value,
                       Set<ExamPlacement> conflicts)

Description copied from interface: Criterion

Value of a proposed assignment (including hard conflicts)

getName

public String getName()

Description copied from interface: Criterion

Criterion name

Specified by:

getName in interface Criterion<Exam,ExamPlacement>

Overrides:

getName in class AbstractCriterion<Exam,ExamPlacement>

getInfo

public void getInfo(Map<String,String> info)

Description copied from interface: InfoProvider

Adds some information into the table with information about the solution

Specified by:

getInfo in interface InfoProvider<Exam>

Overrides:

getInfo in class ExamCriterion

toString

public String toString()

Overrides:

toString in class Object

isPeriodCriterion

public boolean isPeriodCriterion()

Description copied from class: ExamCriterion

True if this criterion is based on period assignment. Used by ExamPlacement.getTimeCost().

Overrides:

isPeriodCriterion in class ExamCriterion