eu.lp0.cursus.scoring.scores.base.AbstractRaceLapsData.java Source code

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Here is the source code for eu.lp0.cursus.scoring.scores.base.AbstractRaceLapsData.java

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/*
   cursus - Race series management program
   Copyright 2012, 2014  Simon Arlott
    
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Affero General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
    
   This program 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 Affero General Public License for more details.
    
   You should have received a copy of the GNU Affero General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package eu.lp0.cursus.scoring.scores.base;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.google.common.collect.ArrayTable;
import com.google.common.collect.Table;

import eu.lp0.cursus.db.data.Pilot;
import eu.lp0.cursus.db.data.Race;
import eu.lp0.cursus.scoring.data.RaceLapsData;
import eu.lp0.cursus.scoring.data.ScoredData;

public abstract class AbstractRaceLapsData<T extends ScoredData> implements RaceLapsData {
    protected final T scores;
    private volatile boolean initialised;
    private Table<Race, Pilot, Integer> raceLaps;
    private Map<Race, List<Pilot>> raceLapOrder;

    public AbstractRaceLapsData(T scores) {
        this.scores = scores;
    }

    private void lazyInitialisation() {
        if (!initialised) {
            synchronized (this) {
                if (!initialised) {
                    calculateRaceLaps();
                    initialised = true;
                }
            }
        }
    }

    private void calculateRaceLaps() {
        raceLaps = ArrayTable.create(scores.getRaces(), scores.getPilots());
        raceLapOrder = new HashMap<Race, List<Pilot>>(scores.getRaces().size() * 2);

        for (Race race : scores.getRaces()) {
            raceLapOrder.put(race, calculateRaceLapsInOrder(race, raceLaps.row(race)));
        }
    }

    @Override
    public final int getLaps(Pilot pilot, Race race) {
        lazyInitialisation();
        return raceLaps.get(race, pilot);
    }

    @Override
    public final Map<Race, Integer> getLaps(Pilot pilot) {
        lazyInitialisation();
        return raceLaps.column(pilot);
    }

    @Override
    public final Map<Pilot, Integer> getLaps(Race race) {
        lazyInitialisation();
        return raceLaps.row(race);
    }

    @Override
    public final List<Pilot> getLapOrder(Race race) {
        lazyInitialisation();
        return raceLapOrder.get(race);
    }

    protected abstract List<Pilot> calculateRaceLapsInOrder(Race race, Map<Pilot, Integer> laps);
}