Examples with Placement org.cpsolver.coursett.model.Placement used on opensource projects

Example 31 with Placement

use of org.cpsolver.coursett.model.Placement in project cpsolver by UniTime.

the class GroupConstraint method isSatisfiedSeqCheck.

private boolean isSatisfiedSeqCheck(Assignment<Lecture, Placement> assignment, HashMap<Lecture, Placement> assignments, Set<Placement> conflicts) {
    if (!getType().is(Flag.BACK_TO_BACK))
        return true;
    int gapMin = getType().getMin();
    int gapMax = getType().getMax();
    List<Integer> lengths = new ArrayList<Integer>();
    Placement[] res = new Placement[Constants.SLOTS_PER_DAY];
    for (int i = 0; i < Constants.SLOTS_PER_DAY; i++) res[i] = null;
    int nrLectures = 0;
    for (Lecture lecture : variables()) {
        Placement placement = null;
        if (assignments != null && assignments.containsKey(lecture))
            placement = assignments.get(lecture);
        else if (assignment != null)
            placement = assignment.getValue(lecture);
        if (placement == null) {
            if (!lecture.timeLocations().isEmpty())
                lengths.add(lecture.timeLocations().get(0).getLength());
        } else if (conflicts != null && conflicts.contains(placement)) {
            if (!lecture.timeLocations().isEmpty())
                lengths.add(lecture.timeLocations().get(0).getLength());
        } else {
            int pos = placement.getTimeLocation().getStartSlot();
            int length = placement.getTimeLocation().getLength();
            for (int j = pos; j < pos + length; j++) {
                if (res[j] != null) {
                    if (conflicts == null)
                        return false;
                    if (!assignments.containsKey(lecture))
                        conflicts.add(placement);
                    else if (!assignments.containsKey(res[j].variable()))
                        conflicts.add(res[j]);
                }
            }
            for (int j = pos; j < pos + length; j++) res[j] = placement;
            nrLectures++;
        }
    }
    if (nrLectures <= 1)
        return true;
    if (iIsRequired || (!iIsProhibited && iPreference < 0)) {
        int i = 0;
        Placement p = res[i];
        while (p == null) p = res[++i];
        i = res[i].getTimeLocation().getStartSlot() + res[i].getTimeLocation().getLength();
        nrLectures--;
        while (nrLectures > 0) {
            int gap = 0;
            while (i < Constants.SLOTS_PER_DAY && res[i] == null) {
                gap++;
                i++;
            }
            if (i == Constants.SLOTS_PER_DAY)
                break;
            if (!canFill(gap, gapMin, gapMax, lengths))
                return false;
            p = res[i];
            i = res[i].getTimeLocation().getStartSlot() + res[i].getTimeLocation().getLength();
            nrLectures--;
        }
    } else if (iIsProhibited || (!iIsRequired && iPreference > 0)) {
        int i = 0;
        Placement p = res[i];
        while (p == null) p = res[++i];
        i = res[i].getTimeLocation().getStartSlot() + res[i].getTimeLocation().getLength();
        nrLectures--;
        while (nrLectures > 0) {
            int gap = 0;
            while (i < Constants.SLOTS_PER_DAY && res[i] == null) {
                gap++;
                i++;
            }
            if (i == Constants.SLOTS_PER_DAY)
                break;
            if ((gapMin == 0 || !canFill(gap, 0, gapMin - 1, lengths)) && (gapMax >= Constants.SLOTS_PER_DAY || !canFill(gap, gapMax + 1, Constants.SLOTS_PER_DAY, lengths))) {
                return false;
            }
            p = res[i];
            i = res[i].getTimeLocation().getStartSlot() + res[i].getTimeLocation().getLength();
            nrLectures--;
        }
    }
    return true;
}

Example 32 with Placement

use of org.cpsolver.coursett.model.Placement in project cpsolver by UniTime.

the class GroupConstraint method getCurrentPreference.

/** Current constraint preference change (if given placement is assigned) 
     * @param assignment current assignment
     * @param placement placement that is being considered
     * @return change in the current preference, if assigned 
     **/
public int getCurrentPreference(Assignment<Lecture, Placement> assignment, Placement placement) {
    // no preference
    if (isHard())
        return 0;
    // not enough variable
    if (countAssignedVariables(assignment) + (assignment.getValue(placement.variable()) == null ? 1 : 0) < 2)
        return 0;
    if (getType().is(Flag.MAX_HRS_DAY)) {
        HashMap<Lecture, Placement> assignments = new HashMap<Lecture, Placement>();
        assignments.put(placement.variable(), placement);
        HashMap<Lecture, Placement> unassignments = new HashMap<Lecture, Placement>();
        unassignments.put(placement.variable(), null);
        int after = 0;
        int before = 0;
        for (int dayCode : Constants.DAY_CODES) {
            if (iMaxNHoursADayConsiderDatePatterns) {
                for (BitSet week : ((TimetableModel) getModel()).getWeeks()) {
                    after += Math.max(0, nrSlotsADay(assignment, dayCode, week, assignments, null) - getType().getMax());
                    before += Math.max(0, nrSlotsADay(assignment, dayCode, week, unassignments, null) - getType().getMax());
                }
            } else {
                after += Math.max(0, nrSlotsADay(assignment, dayCode, null, assignments, null) - getType().getMax());
                before += Math.max(0, nrSlotsADay(assignment, dayCode, null, unassignments, null) - getType().getMax());
            }
        }
        return (after > 0 ? Math.abs(iPreference) * after / 12 : -Math.abs(iPreference)) - (before > 0 ? Math.abs(iPreference) * before / 12 : -Math.abs(iPreference));
    }
    int nrViolatedPairsAfter = 0;
    int nrViolatedPairsBefore = 0;
    for (Lecture v1 : variables()) {
        for (Lecture v2 : variables()) {
            if (v1.getId() >= v2.getId())
                continue;
            Placement p1 = (v1.equals(placement.variable()) ? null : assignment.getValue(v1));
            Placement p2 = (v2.equals(placement.variable()) ? null : assignment.getValue(v2));
            if (p1 != null && p2 != null && !isSatisfiedPair(assignment, p1, p2))
                nrViolatedPairsBefore++;
            if (v1.equals(placement.variable()))
                p1 = placement;
            if (v2.equals(placement.variable()))
                p2 = placement;
            if (p1 != null && p2 != null && !isSatisfiedPair(assignment, p1, p2))
                nrViolatedPairsAfter++;
        }
    }
    if (getType().is(Flag.BACK_TO_BACK)) {
        HashMap<Lecture, Placement> assignments = new HashMap<Lecture, Placement>();
        assignments.put(placement.variable(), placement);
        Set<Placement> conflicts = new HashSet<Placement>();
        if (isSatisfiedSeq(assignment, assignments, conflicts))
            nrViolatedPairsAfter += conflicts.size();
        else
            nrViolatedPairsAfter = variables().size();
        HashMap<Lecture, Placement> unassignments = new HashMap<Lecture, Placement>();
        unassignments.put(placement.variable(), null);
        Set<Placement> previous = new HashSet<Placement>();
        if (isSatisfiedSeq(assignment, unassignments, previous))
            nrViolatedPairsBefore += previous.size();
        else
            nrViolatedPairsBefore = variables().size();
    }
    return (nrViolatedPairsAfter > 0 ? Math.abs(iPreference) * nrViolatedPairsAfter : -Math.abs(iPreference)) - (nrViolatedPairsBefore > 0 ? Math.abs(iPreference) * nrViolatedPairsBefore : -Math.abs(iPreference));
}

Example 33 with Placement

use of org.cpsolver.coursett.model.Placement in project cpsolver by UniTime.

the class GroupConstraint method isSatisfiedRecursive.

private Set<Placement> isSatisfiedRecursive(Assignment<Lecture, Placement> assignment, int idx, HashMap<Lecture, Placement> assignments, Set<Placement> conflicts, Set<Placement> newConflicts, Set<Placement> bestConflicts) {
    if (idx == variables().size() && newConflicts.isEmpty())
        return bestConflicts;
    if (isSatisfiedSeqCheck(assignment, assignments, conflicts)) {
        if (bestConflicts == null) {
            return new HashSet<Placement>(newConflicts);
        } else {
            int b = 0, n = 0;
            for (Placement value : assignments.values()) {
                if (value != null && bestConflicts.contains(value))
                    b++;
                if (value != null && newConflicts.contains(value))
                    n++;
            }
            if (n < b || (n == b && newConflicts.size() < bestConflicts.size()))
                return new HashSet<Placement>(newConflicts);
        }
        return bestConflicts;
    }
    if (idx == variables().size())
        return bestConflicts;
    bestConflicts = isSatisfiedRecursive(assignment, idx + 1, assignments, conflicts, newConflicts, bestConflicts);
    Lecture lecture = variables().get(idx);
    //if (assignments != null && assignments.containsKey(lecture))
    //    return bestConflicts;
    Placement placement = null;
    if (assignments != null && assignments.containsKey(lecture))
        placement = assignments.get(lecture);
    else if (assignment != null)
        placement = assignment.getValue(lecture);
    if (placement == null)
        return bestConflicts;
    if (conflicts != null && conflicts.contains(placement))
        return bestConflicts;
    conflicts.add(placement);
    newConflicts.add(placement);
    bestConflicts = isSatisfiedRecursive(assignment, idx + 1, assignments, conflicts, newConflicts, bestConflicts);
    newConflicts.remove(placement);
    conflicts.remove(placement);
    return bestConflicts;
}

Example 34 with Placement

use of org.cpsolver.coursett.model.Placement in project cpsolver by UniTime.

the class GroupConstraint method isConsistent.

@Override
public boolean isConsistent(Placement value1, Placement value2) {
    if (!isHard())
        return true;
    if (!isSatisfiedPair(null, value1, value2))
        return false;
    if (getType().is(Flag.BACK_TO_BACK)) {
        HashMap<Lecture, Placement> assignments = new HashMap<Lecture, Placement>();
        assignments.put(value1.variable(), value1);
        assignments.put(value2.variable(), value2);
        if (!isSatisfiedSeq(null, assignments, null))
            return false;
    }
    if (getType().is(Flag.MAX_HRS_DAY)) {
        HashMap<Lecture, Placement> assignments = new HashMap<Lecture, Placement>();
        assignments.put(value1.variable(), value1);
        assignments.put(value2.variable(), value2);
        for (int dayCode : Constants.DAY_CODES) {
            if (iMaxNHoursADayConsiderDatePatterns) {
                for (BitSet week : ((TimetableModel) getModel()).getWeeks()) {
                    if (!value1.getTimeLocation().shareWeeks(week) && !value2.getTimeLocation().shareWeeks(week))
                        continue;
                    if (nrSlotsADay(null, dayCode, week, assignments, null) > getType().getMax())
                        return false;
                }
            } else {
                if (nrSlotsADay(null, dayCode, null, assignments, null) > getType().getMax())
                    return false;
            }
        }
    }
    return true;
}

Example 35 with Placement

use of org.cpsolver.coursett.model.Placement in project cpsolver by UniTime.

the class GroupConstraint method inConflict.

@Override
public boolean inConflict(Assignment<Lecture, Placement> assignment, Placement value) {
    if (!isHard())
        return false;
    for (Lecture v : variables()) {
        if (v.equals(value.variable()))
            // ignore this variable
            continue;
        Placement p = assignment.getValue(v);
        if (p == null)
            // there is an unassigned variable -- great, still a chance to get violated
            continue;
        if (!isSatisfiedPair(assignment, p, value))
            return true;
    }
    if (getType().is(Flag.BACK_TO_BACK)) {
        HashMap<Lecture, Placement> assignments = new HashMap<Lecture, Placement>();
        assignments.put(value.variable(), value);
        if (!isSatisfiedSeq(assignment, assignments, null))
            return true;
    }
    if (getType().is(Flag.MAX_HRS_DAY)) {
        HashMap<Lecture, Placement> assignments = new HashMap<Lecture, Placement>();
        assignments.put(value.variable(), value);
        for (int dayCode : Constants.DAY_CODES) {
            if (iMaxNHoursADayConsiderDatePatterns) {
                for (BitSet week : ((TimetableModel) getModel()).getWeeks()) {
                    if (!value.getTimeLocation().shareWeeks(week))
                        continue;
                    if (nrSlotsADay(assignment, dayCode, week, assignments, null) > getType().getMax())
                        return true;
                }
            } else {
                if (nrSlotsADay(assignment, dayCode, null, assignments, null) > getType().getMax())
                    return true;
            }
        }
    }
    if (!forwardCheck(assignment, value, new HashSet<GroupConstraint>(), iForwardCheckMaxDepth - 1))
        return true;
    return false;
}