net.sf.cpsolver.coursett.constraint
Class MaxBreaksFlexibleConstraint
java.lang.Object
net.sf.cpsolver.ifs.model.Constraint<Lecture,Placement>
net.sf.cpsolver.coursett.constraint.FlexibleConstraint
net.sf.cpsolver.coursett.constraint.MaxBreaksFlexibleConstraint
- All Implemented Interfaces:
- Comparable<Constraint<Lecture,Placement>>, WeakeningConstraint<Lecture,Placement>
public class MaxBreaksFlexibleConstraint
- extends FlexibleConstraint
- implements WeakeningConstraint<Lecture,Placement>
The MaxBreaks constraint limits the number of blocks of non back-to-back classes of an instructor on a day.
It has two parameters: a maximal number of breaks and a minimal length of a break between two classes not to be considered in the same block.
Reference _MaxBreaks:1:30_ translates to a maximum number of one break (two blocks) on a day of classes not more than 30 minutes a part.
- Version:
- CourseTT 1.2 (University Course Timetabling)
Copyright (C) 2013 Tomas Muller
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/.
Methods inherited from class net.sf.cpsolver.coursett.constraint.FlexibleConstraint |
getCurrentPreference, getName, getOwner, getPrologPreference, getReference, getRelevantPlacements, getType, getWeeks, isConsistent, isHard, mergeToBlocks, toString, unassigned |
Methods inherited from class net.sf.cpsolver.ifs.model.Constraint |
addConstraintListener, addVariable, assignedVariables, compareTo, constraintListeners, countAssignedVariables, countVariables, equals, getDescription, getId, getModel, hashCode, inConflict, removeConstraintListener, removeVariable, setModel, variables |
MaxBreaksFlexibleConstraint
public MaxBreaksFlexibleConstraint(Long id,
String owner,
String preference,
String reference)
getBlocks
public List<FlexibleConstraint.Block> getBlocks(int dayCode,
Set<Placement> conflicts,
Placement value,
HashMap<Lecture,Placement> assignments,
BitSet week)
getNrViolations
public double getNrViolations(Set<Placement> conflicts,
HashMap<Lecture,Placement> assignments)
- Specified by:
getNrViolations
in class FlexibleConstraint
- Parameters:
conflicts
- conflicting placements to be unassignedassignments
- assigned placements
- Returns:
- the number of violations of the constraint during days and all weeks of the semester
computeConflicts
public void computeConflicts(Placement value,
Set<Placement> conflicts)
- Description copied from class:
Constraint
- The only method which has to be implemented by any constraint. It returns
the values which needs to be unassigned in order to make this constraint
consistent with the given value if it is assigned to its variable. The
computed list of conflicting values is added to the given set of
conflicts.
- Specified by:
computeConflicts
in class FlexibleConstraint
- Parameters:
value
- value to be assigned to its varaibleconflicts
- resultant set of conflicting values
weaken
public void weaken()
- Description copied from interface:
WeakeningConstraint
- Weaken the constraint. This method is called if the constraint
participates in an unassigned of a variable.
- Specified by:
weaken
in interface WeakeningConstraint<Lecture,Placement>
weaken
public void weaken(Placement value)
- Description copied from interface:
WeakeningConstraint
- Weaken the constraint enough so that it can assign the given
value.
- Specified by:
weaken
in interface WeakeningConstraint<Lecture,Placement>
assigned
public void assigned(long iteration,
Placement value)
- Description copied from class:
Constraint
- Given value is to be assigned to its varable. In this method, the
constraint should unassigns all varaibles which are in conflict with the
given assignment because of this constraint.
- Overrides:
assigned
in class FlexibleConstraint
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