org.cpsolver.exam.split

Class ExamSplitMoves.ExamMergeNeighbour

java.lang.Object

org.cpsolver.exam.split.ExamSplitMoves.ExamMergeNeighbour

All Implemented Interfaces:

Neighbour<Exam,ExamPlacement>

Enclosing class:

ExamSplitMoves

protected class ExamSplitMoves.ExamMergeNeighbour
extends Object
implements Neighbour<Exam,ExamPlacement>

Merge two exams that have been split before back into one. This moves the students from the child exam back to its parent and removes the child exam from the problem.

Constructor Summary

Constructors

Constructor and Description
ExamMergeNeighbour(Assignment<Exam,ExamPlacement> assignment, Exam exam) Child exam to be removed.

Method Summary

Modifier and Type	Method and Description
void	assign(Assignment<Exam,ExamPlacement> assignment, long iteration) Perform the merge.
Map<Exam,ExamPlacement>	assignments() Return assignments to be done.
Exam	exam() Exam to be merged.
int	nrStudents() Number of students that will be moved back to the parent exam or to some other child (if there are any).
double	value(Assignment<Exam,ExamPlacement> assignment) Value of the merge.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExamMergeNeighbour

public ExamMergeNeighbour(Assignment<Exam,ExamPlacement> assignment,
                          Exam exam)

Child exam to be removed.

Parameters:

assignment - current assignment

exam - child exam to be merged back

Method Detail

assign

public void assign(Assignment<Exam,ExamPlacement> assignment,
                   long iteration)

Perform the merge.

Specified by:

assign in interface Neighbour<Exam,ExamPlacement>

Parameters:

assignment - current assignment

iteration - current iteration

value

public double value(Assignment<Exam,ExamPlacement> assignment)

Value of the merge. This is the weighted sum of all student conflicts that will be added by the merge, minus the weight of the splitter criterion.

Specified by:

value in interface Neighbour<Exam,ExamPlacement>

Parameters:

assignment - current assignment

Returns:

difference in the solution value when assigned

nrStudents

public int nrStudents()

Number of students that will be moved back to the parent exam or to some other child (if there are any).

Returns:

number of students

exam

public Exam exam()

Exam to be merged.

Returns:

exam to be merged

assignments

public Map<Exam,ExamPlacement> assignments()

Description copied from interface: Neighbour

Return assignments to be done.

Specified by:

assignments in interface Neighbour<Exam,ExamPlacement>

Returns:

list of assignments (including unassignments) of this neighbour