usermanager.java.txt

刚开始学习看的

/*
 * Copyright 2002-2005 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.swato.json_rpc.demo;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * @author Zhijie Chen ([e-mail])
 */
public class UserManager {

    private static Map m_userData = new HashMap();

    public static User aNewUser() {
        return new User();
    }

    public static User getUserByid(int userId) {
        return (User) m_userData.get(String.valueOf(userId));
    }

    public static void storeUser(User user) {
        if (user.getId() == 0) {
            int key = getNextKey();
            user.setId(key);
        }
        m_userData.put(String.valueOf(user.getId()), user);
    }

    public static void removeUser(int userId) {
        m_userData.remove(String.valueOf(userId));
    }

    public static void clearAll() {
        m_userData.clear();
    }

    public static final User[] getUserList() {
        User[] users = (User[]) m_userData.values().toArray(new User[] {});
        Arrays.sort(users);
        return users;
    }

    private static int getNextKey() {
        Iterator iter = m_userData.keySet().iterator();
        int max = 0;
        while (iter.hasNext()) {
            String element = (String) iter.next();
            int keyValue = Integer.parseInt(element);
            if (keyValue > max)
                max = keyValue;
        }
        return max + 1;
    }

}