package com.main.apps.message;

import java.util.Vector;

import com.main.apps.message.MMSInfo;

public class MMSInfoList
{
    
    /**
     * 線程同步控制確保模塊僅有一個(gè)實(shí)例
     * @return SMSInfoList
     */
    static synchronized public MMSInfoList getInstance()
    {
        if (instance == null)
        {
            instance = new MMSInfoList();
        }
        return instance;
    }

    /**
     * 構(gòu)造器，默認(rèn)消息隊(duì)列長度為100
     *
     */        
    private MMSInfoList()
    {
        list = new Vector(100);
    }

    /**
     * 向消息隊(duì)列添加消息
     * @param info, SMSInfo
     */
    public synchronized void add(MMSInfo info)
    {
        list.addElement(info);
    }

    /**
     * 返回并刪除消息隊(duì)列起始處消息，若消息隊(duì)列為空，返回空
     * @return SMSInfo
     */
    public synchronized MMSInfo remove()
    {
        if (list.size() == 0)
        {
            return null;
        }
        return (MMSInfo) list.remove(0);
    }

    /**
     * 返回消息隊(duì)列長度
     * @return Integer
     */
    public int getSize()
    {
        return list.size();
    }
    
    /** 消息模塊實(shí)例 */
    static private MMSInfoList instance;

    /** 消息隊(duì)列 */
    private Vector list;
}