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The constraint solver library contains a local search based framework that allows modeling of a problem using constraint programming primitives (variables, values, constraints).

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package org.cpsolver.exam.reports;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.TreeSet;

import org.cpsolver.exam.criteria.StudentBackToBackConflicts;
import org.cpsolver.exam.criteria.StudentDistanceBackToBackConflicts;
import org.cpsolver.exam.model.Exam;
import org.cpsolver.exam.model.ExamModel;
import org.cpsolver.exam.model.ExamOwner;
import org.cpsolver.exam.model.ExamPeriod;
import org.cpsolver.exam.model.ExamPlacement;
import org.cpsolver.exam.model.ExamRoomPlacement;
import org.cpsolver.exam.model.ExamStudent;
import org.cpsolver.ifs.assignment.Assignment;
import org.cpsolver.ifs.util.CSVFile;
import org.cpsolver.ifs.util.CSVFile.CSVField;


/**
 * Export student direct, back-to-back, and more than two exams a day conflicts
 * into a CSV file. 
*
* Usage: *

 *     new ExamStudentConflictsBySectionCourse(model).report().save(file);
 * 
*
* * @author Tomas Muller * @version ExamTT 1.3 (Examination Timetabling)
* Copyright (C) 2008 - 2014 Tomas Muller
* [email protected]
* 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/. */ public class ExamStudentConflictsBySectionCourse { private ExamModel iModel = null; /** * Constructor * * @param model * examination timetabling model */ public ExamStudentConflictsBySectionCourse(ExamModel model) { iModel = model; } private List getOwners(Exam exam) { if (!exam.getOwners().isEmpty()) return exam.getOwners(); ExamOwner cs = new ExamOwner(exam, exam.getId(), exam.getName()); cs.getStudents().addAll(exam.getStudents()); List ret = new ArrayList(1); ret.add(cs); return ret; } private List getOwners(Exam exam, ExamStudent student) { List ret = new ArrayList(exam.getOwners(student)); if (ret.isEmpty()) { ExamOwner cs = new ExamOwner(exam, exam.getId(), exam.getName()); cs.getStudents().add(student); ret.add(cs); } Collections.sort(ret); return ret; } /** * generate report * @param assignment current assignment * @return resultant report */ public CSVFile report(Assignment assignment) { CSVFile csv = new CSVFile(); csv.setHeader(new CSVField[] { new CSVField("Section/Course"), new CSVField("Period"), new CSVField("Day"), new CSVField("Time"), new CSVField("Room"), new CSVField("Student"), new CSVField("Type"), new CSVField("Section/Course"), new CSVField("Period"), new CSVField("Time"), new CSVField("Room"), new CSVField("Distance") }); boolean isDayBreakBackToBack = ((StudentBackToBackConflicts)iModel.getCriterion(StudentBackToBackConflicts.class)).isDayBreakBackToBack(); double backToBackDistance = ((StudentDistanceBackToBackConflicts)iModel.getCriterion(StudentDistanceBackToBackConflicts.class)).getBackToBackDistance(); TreeSet courseSections = new TreeSet(); for (Exam exam : iModel.variables()) { courseSections.addAll(getOwners(exam)); } for (ExamOwner cs : courseSections) { Exam exam = cs.getExam(); ExamPlacement placement = assignment.getValue(exam); if (placement == null) continue; String roomsThisExam = ""; for (ExamRoomPlacement room : placement.getRoomPlacements()) { if (roomsThisExam.length() > 0) roomsThisExam += ", "; roomsThisExam += room.getName(); } ExamPeriod period = placement.getPeriod(); boolean csPrinted = false; List students = new ArrayList(cs.getStudents()); Collections.sort(students, new Comparator() { @Override public int compare(ExamStudent s1, ExamStudent s2) { int cmp = s1.getName().compareTo(s2.getName()); if (cmp != 0) return cmp; return Double.compare(s1.getId(), s2.getId()); } }); for (ExamStudent student : students) { boolean stdPrinted = false; int nrExams = student.getExams(assignment, period).size(); if (nrExams > 1) { boolean typePrinted = false; for (Exam otherExam : student.getExams(assignment, period)) { if (otherExam.equals(exam)) continue; ExamPlacement otherPlacement = assignment.getValue(otherExam); ExamPeriod otherPeriod = otherPlacement.getPeriod(); String roomsOtherExam = ""; for (ExamRoomPlacement room : otherPlacement.getRoomPlacements()) { if (roomsOtherExam.length() > 0) roomsOtherExam += ", "; roomsOtherExam += room.getName(); } boolean otherPrinted = false; for (ExamOwner ocs : getOwners(otherExam, student)) { csv.addLine(new CSVField[] { new CSVField(csPrinted ? "" : cs.getName()), new CSVField(csPrinted ? "" : String.valueOf(1 + period.getIndex())), new CSVField(csPrinted ? "" : period.getDayStr()), new CSVField(csPrinted ? "" : period.getTimeStr()), new CSVField(csPrinted ? "" : roomsThisExam), new CSVField(stdPrinted ? "" : student.getName()), new CSVField(typePrinted ? "" : "direct"), new CSVField(ocs.getName()), new CSVField(otherPrinted ? "" : String.valueOf(1 + otherPeriod.getIndex())), new CSVField(otherPrinted ? "" : otherPeriod.getTimeStr()), new CSVField(otherPrinted ? "" : roomsOtherExam) }); csPrinted = true; stdPrinted = true; typePrinted = true; otherPrinted = true; } } } if (nrExams > 0) { boolean typePrinted = false; List periods = new ArrayList(2); if (period.prev() != null && !student.getExams(assignment, period.prev()).isEmpty() && (!isDayBreakBackToBack || period.prev().getDay() == period.getDay())) periods.add(period.prev()); if (period.next() != null && !student.getExams(assignment, period.next()).isEmpty() && (!isDayBreakBackToBack || period.next().getDay() == period.getDay())) periods.add(period.next()); for (ExamPeriod otherPeriod : periods) { for (Exam otherExam : student.getExams(assignment, otherPeriod)) { ExamPlacement otherPlacement = assignment.getValue(otherExam); String roomsOtherExam = ""; for (ExamRoomPlacement room : otherPlacement.getRoomPlacements()) { if (roomsOtherExam.length() > 0) roomsOtherExam += ", "; roomsOtherExam += room.getName(); } String distStr = ""; if (backToBackDistance >= 0) { double dist = placement.getDistanceInMeters(otherPlacement); if (dist > 0) distStr = String.valueOf(dist); } boolean otherPrinted = false; for (ExamOwner ocs : getOwners(otherExam, student)) { csv.addLine(new CSVField[] { new CSVField(csPrinted ? "" : cs.getName()), new CSVField(csPrinted ? "" : String.valueOf(1 + period.getIndex())), new CSVField(csPrinted ? "" : period.getDayStr()), new CSVField(csPrinted ? "" : period.getTimeStr()), new CSVField(csPrinted ? "" : roomsThisExam), new CSVField(stdPrinted ? "" : student.getName()), new CSVField(typePrinted ? "" : "back-to-back"), new CSVField(ocs.getName()), new CSVField(otherPrinted ? "" : String.valueOf(1 + otherPeriod.getIndex())), new CSVField(otherPrinted ? "" : otherPeriod.getTimeStr()), new CSVField(otherPrinted ? "" : roomsOtherExam), new CSVField(otherPrinted ? "" : distStr), }); csPrinted = true; stdPrinted = true; typePrinted = true; otherPrinted = true; } } } } int nrExamsADay = student.getExamsADay(assignment, period.getDay()).size(); if (nrExamsADay > 2) { boolean typePrinted = false; for (Exam otherExam : student.getExamsADay(assignment, period.getDay())) { if (otherExam.equals(exam)) continue; ExamPlacement otherPlacement = assignment.getValue(otherExam); ExamPeriod otherPeriod = otherPlacement.getPeriod(); String roomsOtherExam = ""; for (ExamRoomPlacement room : otherPlacement.getRoomPlacements()) { if (roomsOtherExam.length() > 0) roomsOtherExam += ", "; roomsOtherExam += room.getName(); } boolean otherPrinted = false; for (ExamOwner ocs : getOwners(otherExam, student)) { csv.addLine(new CSVField[] { new CSVField(csPrinted ? "" : cs.getName()), new CSVField(csPrinted ? "" : String.valueOf(1 + period.getIndex())), new CSVField(csPrinted ? "" : period.getDayStr()), new CSVField(csPrinted ? "" : period.getTimeStr()), new CSVField(csPrinted ? "" : roomsThisExam), new CSVField(stdPrinted ? "" : student.getName()), new CSVField(typePrinted ? "" : "more-2-day"), new CSVField(ocs.getName()), new CSVField(otherPrinted ? "" : String.valueOf(1 + otherPeriod.getIndex())), new CSVField(otherPrinted ? "" : otherPeriod.getTimeStr()), new CSVField(otherPrinted ? "" : roomsOtherExam) }); csPrinted = true; stdPrinted = true; typePrinted = true; otherPrinted = true; } } } } } return csv; } }




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