UserXstreamDao.java

package org.apache.wicket.persistence.provider;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.wicket.util.io.IOUtils;
import org.jabox.environment.Environment;
import org.jabox.model.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.thoughtworks.xstream.XStream;

public class UserXstreamDao {
    private static final Logger LOGGER = LoggerFactory
        .getLogger(UserXstreamDao.class);

    private static XStream getXStream() {
        XStream xstream = new XStream();
        xstream.alias("user", User.class);
        return xstream;
    }

    public static void persist(User user) {
        XStream xstream = getXStream();
        String xml = xstream.toXML(user);
        try {
            File usersDir = Environment.getUsersDir();
            File file = new File(usersDir, user.getLogin() + ".xml");
            FileWriter writer = new FileWriter(file);
            writer.write(xml);
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static List<User> getUsers() {
        ArrayList<User> users = new ArrayList<User>();
        File usersDir = Environment.getUsersDir();

        String[] children = usersDir.list();
        if (children == null) {
            // Either dir does not exist or is not a directory
        } else {
            for (int i = 0; i < children.length; i++) {
                // Get filename of file or directory
                String filename = children[i];
                String login = filename.replaceAll(".xml$", "");
                users.add(getUser(login));
            }
        }

        return users;
    }

    public static User getUser(String login) {
        XStream xstream = getXStream();

        File usersDir = Environment.getUsersDir();
        File file = new File(usersDir, login + ".xml");
        FileInputStream is = null;
        try {
            is = new FileInputStream(file);
            User user = (User) xstream.fromXML(is);
            return user;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }finally {
            if (is!= null)
              IOUtils.closeQuietly(is);
        }
        return null;
    }

    public static void deleteUser(User user) {
        File file =
            new File(Environment.getUsersDir(), user.getLogin() + ".xml");
        file.delete();
        LOGGER.info("User \"" + user.getLogin() + "\" deleted");
    }
}