/*
* Copyright 2010 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.optaplanner.examples.dinnerparty.solver.solution.initializer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.optaplanner.core.api.score.Score;
import org.optaplanner.core.api.score.buildin.simple.SimpleScore;
import org.optaplanner.core.impl.phase.custom.CustomPhaseCommand;
import org.optaplanner.core.impl.score.director.ScoreDirector;
import org.optaplanner.examples.common.domain.PersistableIdComparator;
import org.optaplanner.examples.dinnerparty.domain.DinnerParty;
import org.optaplanner.examples.dinnerparty.domain.Guest;
import org.optaplanner.examples.dinnerparty.domain.Seat;
import org.optaplanner.examples.dinnerparty.domain.SeatDesignation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class DinnerPartySolutionInitializer implements CustomPhaseCommand {
protected final transient Logger logger = LoggerFactory.getLogger(getClass());
public void changeWorkingSolution(ScoreDirector scoreDirector) {
DinnerParty dinnerParty = (DinnerParty) scoreDirector.getWorkingSolution();
initializeSeatDesignationList(scoreDirector, dinnerParty);
}
private void initializeSeatDesignationList(ScoreDirector scoreDirector, DinnerParty dinnerParty) {
// TODO the planning entity list from the solution should be used and might already contain initialized entities
List<SeatDesignation> seatDesignationList = createSeatDesignationList(dinnerParty);
// Assign one guest at a time
List<Seat> undesignatedSeatList = new ArrayList<Seat>(dinnerParty.getSeatList());
for (SeatDesignation seatDesignation : seatDesignationList) {
Score bestScore = SimpleScore.valueOf(Integer.MIN_VALUE);
Seat bestSeat = null;
boolean added = false;
// Try every seat for that guest
// TODO by reordening the seats so index 0 has a different table then index 1 and so on,
// this will probably be faster because perfectMatch will be true sooner
for (Seat seat : undesignatedSeatList) {
if (seatDesignation.getGuest().getGender() == seat.getRequiredGender()) {
if (!added) {
scoreDirector.beforeEntityAdded(seatDesignation);
seatDesignation.setSeat(seat);
scoreDirector.afterEntityAdded(seatDesignation);
added = true;
} else {
scoreDirector.beforeVariableChanged(seatDesignation, "seat");
seatDesignation.setSeat(seat);
scoreDirector.afterVariableChanged(seatDesignation, "seat");
}
Score score = scoreDirector.calculateScore();
if (score.compareTo(bestScore) > 0) {
bestScore = score;
bestSeat = seat;
}
}
}
if (bestSeat == null) {
throw new IllegalStateException("The bestSeat (" + bestSeat + ") cannot be null.");
}
scoreDirector.beforeVariableChanged(seatDesignation, "seat");
seatDesignation.setSeat(bestSeat);
scoreDirector.afterVariableChanged(seatDesignation, "seat");
// There will always be enough allowed seats: ok to do this for this problem, but not ok for most problems
undesignatedSeatList.remove(bestSeat);
}
// For the GUI's combobox list mainly, not really needed
Collections.sort(seatDesignationList, new PersistableIdComparator());
dinnerParty.setSeatDesignationList(seatDesignationList);
}
private List<SeatDesignation> createSeatDesignationList(DinnerParty dinnerParty) {
List<SeatDesignation> seatDesignationList = new ArrayList<SeatDesignation>(dinnerParty.getGuestList().size());
for (Guest guest : dinnerParty.getGuestList()) {
SeatDesignation seatDesignation = new SeatDesignation();
seatDesignation.setId(guest.getId());
seatDesignation.setGuest(guest);
seatDesignationList.add(seatDesignation);
}
return seatDesignationList;
}
}