VoxelWars.java

package com.voxelwars.util.proxy;

import com.voxelwars.VoxelWarsMod;
import com.voxelwars.VoxelWarsPlugin;
import org.slf4j.Logger;
import org.spongepowered.api.Game;

import java.io.File;
import java.util.Optional;

public final class VoxelWars {

    private static VoxelWarsMod singleton;

    public static void setSingleton(VoxelWarsMod singleton) {
        if (VoxelWars.singleton != null) {
            throw new IllegalStateException("Cannot redefine VoxelWarsMod singleton!");
        }

        VoxelWars.singleton = singleton;
    }

    public static VoxelWarsMod getSingleton() {
        return VoxelWars.singleton;
    }

    public static VoxelWarsPlugin getPluginContainer() {
        return VoxelWars.singleton.getPluginContainer();
    }

    public static Game getGame() {
        return VoxelWars.singleton.getGame();
    }

    public static Logger getLogger() {
        return VoxelWars.singleton.getLogger();
    }

    public static File getConfigDir() {
        return VoxelWars.singleton.getConfigDir();
    }
}

VoxelWarsMod.java

package com.voxelwars;

import com.voxelwars.config.Config;
import org.slf4j.Logger;
import org.spongepowered.api.Game;

import java.io.File;

public class VoxelWarsMod {

    private final VoxelWarsPlugin pluginContainer;
    private final Game game;
    private final Logger logger;
    private final File configDir;

    public VoxelWarsMod(VoxelWarsPlugin pluginContainer, Game game, Logger logger, File configDir) {
        this.pluginContainer = pluginContainer;
        this.game = game;
        this.logger = logger;
        this.configDir = configDir;
    }

    public VoxelWarsPlugin getPluginContainer() {
        return this.pluginContainer;
    }

    public Game getGame() {
        return this.game;
    }

    public Logger getLogger() {
        return this.logger;
    }

    public File getConfigDir() {
        return this.configDir;
    }
}

VoxelWarsPlugin.java

package com.voxelwars;

import com.google.inject.Inject;
import com.voxelwars.config.ConfigPath;
import com.voxelwars.util.proxy.VoxelWars;
import org.slf4j.Logger;
import org.spongepowered.api.Game;
import org.spongepowered.api.event.Subscribe;
import org.spongepowered.api.event.state.InitializationEvent;
import org.spongepowered.api.plugin.Plugin;
import org.spongepowered.api.service.config.ConfigDir;

import java.io.*;

@Plugin(id = "voxelwars", name = "VoxelWars", version = "1.0-SNAPSHOT")
public class VoxelWarsPlugin {

    @Inject private Game game;
    @Inject private Logger logger;
    @Inject @ConfigDir(sharedRoot = false) private File configDir;

    @Subscribe public void onInit(InitializationEvent event) {
        VoxelWars.setSingleton(new VoxelWarsMod(this, this.game, this.logger, this.configDir));
    }
}