TF-EssentialsX/EssentialsXMPP/src/main/java/com/earth2me/essentials/xmpp/UserManager.java

package com.earth2me.essentials.xmpp;

import com.earth2me.essentials.IConf;
import com.earth2me.essentials.config.ConfigurateUtil;
import com.earth2me.essentials.config.EssentialsConfiguration;

import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;

public class UserManager implements IConf {
    private static final String ADDRESS = "address";
    private static final String SPY = "spy";
    private final transient EssentialsConfiguration users;
    private final transient List<String> spyusers = Collections.synchronizedList(new ArrayList<>());

    UserManager(final File folder) {
        users = new EssentialsConfiguration(new File(folder, "users.yml"));
        reloadConfig();
    }

    final boolean isSpy(final String username) {
        return users.getBoolean(username.toLowerCase(Locale.ENGLISH) + "." + SPY, false);
    }

    void setSpy(final String username, final boolean spy) {
        setUser(username.toLowerCase(Locale.ENGLISH), getAddress(username), spy);
    }

    final String getAddress(final String username) {
        return users.getString(username.toLowerCase(Locale.ENGLISH) + "." + ADDRESS, null);
    }

    final String getUserByAddress(final String search) {
        final Set<String> usernames = ConfigurateUtil.getRootNodeKeys(users);
        for (final String username : usernames) {
            final String address = users.getString(username + "." + ADDRESS, null);
            if (search.equalsIgnoreCase(address)) {
                return username;
            }
        }
        return null;
    }

    void setAddress(final String username, final String address) {
        setUser(username.toLowerCase(Locale.ENGLISH), address, isSpy(username));
    }

    List<String> getSpyUsers() {
        return spyusers;
    }

    private void setUser(final String username, final String address, final boolean spy) {
        final Map<String, Object> userdata = new HashMap<>();
        userdata.put(ADDRESS, address);
        userdata.put(SPY, spy);
        users.setRaw(username, userdata);
        users.save();
        reloadConfig();
    }

    @Override
    public final void reloadConfig() {
        users.load();
        spyusers.clear();
        final Set<String> keys = ConfigurateUtil.getRootNodeKeys(users);
        for (final String key : keys) {
            if (isSpy(key)) {
                final String address = getAddress(key);
                if (address != null) {
                    spyusers.add(address);
                }
            }
        }
    }
}