设计模式之Command

 

<?php
interface ICommand
{
    function onCommand($name,$args);
}

class CommandChain
{
    private$_commands=array();

    publicfunction addCommand($cmd)
    {
        $this->_commands[] =$cmd;
    }

    publicfunction runCommand($name,$args)
    {
        foreach ($this->_commands as$cmd) {
            if ($cmd->onCommand($name,$args)) {
                return;
            }
        }
    }
}

class UserCommand implements ICommand
{
    publicfunction onCommand($name,$args)
    {
        if ($name!='addUser') {
            returnfalse;
        }

        echo"Run UserCommand <br />";
        returntrue;
    }
}

class MailCommand implements ICommand
{
    publicfunction onCommand($name,$args)
    {
        if ($name!='mail') {
            returnfalse;
        }

        echo"Run MailCommand <br />";
    }
}

$cc=new CommandChain();
$cc->addCommand(new UserCommand());
$cc->addCommand(new MailCommand());
$cc->runCommand('addUser',null);
$cc->runCommand('mail',null);

 

 输出结果

Run UserCommand
Run MailCommand

 

 

李恺的博客已迁移到youyuge.com