Neat little manager and wrapper for handling custom files using the Bukkit Configuration API

CustomFile.java

package us.carlosmendez.gists.file;

import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.plugin.java.JavaPlugin;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.logging.Level;

public class CustomFile {
    private JavaPlugin plugin;
    private String fileName;
    private File file;
    private FileConfiguration fileConfig;

    public CustomFile(JavaPlugin plugin, String fileName) {
        this.plugin = plugin;
        this.fileName = fileName;
    }

    public void reloadConfig(){
        if (file == null){
            file = new File(plugin.getDataFolder(), fileName + ".yml");
        }

        fileConfig = YamlConfiguration.loadConfiguration(file);

        InputStream defConfigStream = plugin.getResource(fileName + ".yml");
        if(defConfigStream != null){
            YamlConfiguration defConfig = YamlConfiguration.loadConfiguration(new InputStreamReader(defConfigStream));
            fileConfig.setDefaults(defConfig);
        }
    }

    public FileConfiguration getConfig(){
        if(fileConfig == null){
            reloadConfig();
        }
        return fileConfig;
    }

    public void saveConfig(){
        if(fileConfig == null || file == null){
            return;
        }
        try{
            getConfig().save(file);
        } catch (IOException ex){
            plugin.getLogger().log(Level.SEVERE, "Could not save config to " + file, ex);
        }
    }

    public void saveDefaultConfig(){
        if(file == null){
            file = new File(plugin.getDataFolder(), fileName + ".yml");
        }
        if(!file.exists()){
            plugin.saveResource(fileName + ".yml", false);
        }
    }

}

FileManager.java

package us.carlosmendez.gists.file;

import org.bukkit.plugin.java.JavaPlugin;

import java.util.HashMap;

public class FileManager {
    private JavaPlugin plugin;
    private HashMap<String, CustomFile> fileMap = new HashMap<>();

    public FileManager(JavaPlugin plugin) {
        this.plugin = plugin;
    }

    public boolean fileExists(String fileName) { return fileMap.containsKey(fileName); }

    public CustomFile getFile(String fileName) {
        if (!fileExists(fileName)) registerFile(fileName);

        return fileMap.get(fileName);
    }

    public CustomFile registerFile(String fileName) {
        if (fileExists(fileName)) return getFile(fileName);
        CustomFile customFile = new CustomFile(plugin, fileName);

        fileMap.put(fileName, customFile);
        customFile.saveDefaultConfig();

        return customFile;
    }
}