src/main/java/design/persistence/JSONLeagueDatabase.java


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package design.persistence;

import design.model.League;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

public class JSONLeagueDatabase implements LeagueDatabase {

    private static JSONLeagueDatabase INSTANCE;

    public static JSONLeagueDatabase instance() {
        if (INSTANCE == null) {
            INSTANCE = new JSONLeagueDatabase("data/leaguedb.json");
        }
        return INSTANCE;
    }

    private final Map<Integer, League> cache;
    private final File file;

    public JSONLeagueDatabase(String filename) {
        this.file = new File(filename);
        this.cache = new HashMap<>();
    }

    private void load() {
        //TODO impl
    }

    private void save() {
        //TODO impl
    }

    @Override
    public League getLeague(int id) {
        return cache.get(id);
    }

    @Override
    public League[] getLeagues() {
        return cache.values().toArray(League[]::new);
    }

    @Override
    public void addLeague(League league) {
        cache.putIfAbsent(league.getId(), league);
        save();
    }

    @Override
    public void removeLeague(League league) {
        cache.remove(league.getId());
        save();
    }

    @Override
    public void updateLeague(League league) {
        cache.put(league.getId(), league);
        save();
    }
}