<?php
/*
*@author:NoAngels
*@time:08年08月30日
*/
interface IRunAction{
//獲取類中定義的可以被APP中run的方法
static function LoadActions();
//類中的入口函數(shù)調(diào)用該類中其他函數(shù)用
function runAction($action, $args);
}
/*
*APP類系統(tǒng)的核心部分
*/
class APP{
static private $__instance = null;
static private $__commands = array();
static private $__flag = 1;
private function __construct(){}
//單件模式設(shè)計獲取該類的唯一實例
static function Load(){
if(self::$__instance == null) self::$__instance = new APP;
return self::$__instance;
}
//添加命名到APP的$__instance中每次添加新命令的時候檢查是否之前已經(jīng)添加過一個該類的實例
//如果有就忽略操作如果沒有就添加進(jìn)來
public function addCommand($cmdName){
foreach(self::$__commands as $cmd){
if(strtolower(get_class($cmd)) == strtolower(get_class($cmdName))){
self::$__flag = 0;
break;
}
}
if(self::$__flag == 1) self::$__commands[] = $cmdName;
self::$__flag = 1;
}
//命令鏈模式設(shè)計的核心部分調(diào)用實例的入口函數(shù)
//首先檢查是否在類中允許調(diào)用該操作如果沒有就提示未定義操作退出
public function runCommand($action, $args){
self::$__flag = 0;
foreach(self::$__commands as $cmd){
if(in_array($action, $cmd->LoadActions())){
self::$__flag = 1;
$cmd->runAction($action, $args);
}
}
if(self::$__flag == 0){
self::$__flag = 1;
exit("undefined action by action : $action");
}
}
//刪除某個類的實例,只要指定類的名字即可
public function removeCommand($className){
foreach(self::$__commands as $key=>$cmd){
if(strtolower(get_class($cmd)) == strtolower($className)){
unset(self::$__commands[$key]);
}
}
}
//供大家測試用看看是否添加以及刪除成功
public function viewCommands(){
echo(count(self::$__commands));
}
}
//類User實現(xiàn)接口IRunAction
class User implements IRunAction{
//定義可以調(diào)用的操作
static private $__actions = array('addUser', 'modifyUser', 'removeUser');
//獲取可以調(diào)用的操作,實際過程中不要直接就愛你個$__actions設(shè)計成public調(diào)用
//而應(yīng)該設(shè)計一個LoadActions函數(shù)獲取$__actions的值
static public function LoadActions(){
return self::$__actions;
}
//運行指定函數(shù)
public function runAction($action, $args){
//不明白這個函數(shù)使用的可以參看手冊
call_user_func(array($this,$action), $args);
}
//測試函數(shù)而已
protected function addUser($name){
echo($name);
}
}
//類Test同類User
class Test implements IRunAction{
static private $__actions = array('addTest', 'modifyTest', 'removeTest');
static public function LoadActions(){
return self::$__actions;
}
public function runAction($action, $args){
call_user_func(array($this,$action), $args);
}
protected function addTest($name){
echo($name);
}
}
//以下是測試代碼
APP::Load()->addCommand(new User);
APP::Load()->addCommand(new User);
APP::Load()->addCommand(new User);
APP::Load()->addCommand(new User);
APP::Load()->runCommand('addUser', 'NoAngels');
APP::Load()->addCommand(new Test);
APP::Load()->runCommand('addTest', null);