每日学习笔记（11）

1,php中反射API应用的一个实例

<?php
class Person
{
    public $name;
    function __construct($name) 
    {
        $this->name = $name;
    }
}
interface IModule
{
    function execute();
}
class FtpModule implements IModule
{
    function execute()
    {
    }
    function setHost($host) 
    {
        print "FtpModule::setHost: {$host}\n";
    }
    function setUser($user)
    {
        print "FtpModule::setUser: {$user}\n";
    }
}
class PersonModule implements IModule
{
    function execute()
    {
    }
    function setPerson(Person $person)
    {
        print "PersonModule::setPerson: {$person->name}\n";
    } 
}
class ModuleRunner
{
    private $configData = array("PersonModule" => array('person'=>'bob'),
                                "FtpModule" => array('host' => 'google.com','user' => 'phinecos')
                               );
    private $modules = array();
    function init()
    {
        $interface = new ReflectionClass('IModule');
        foreach( $this->configData as $moduleName => $params) {
            $module_class = new ReflectionClass($moduleName);
            if ( !$module_class -> isSubclassOf($interface) ) {
                throw new Exception("unknown module: $moduleName");
            }
            $module = $module_class->newInstance();
            foreach( $module_class->getMethods() as $method) {
                $this->handleMethod($module, $method, $params);
            }
            array_push($this->modules, $module);
        }
    }
    function handleMethod(IModule $module, ReflectionMethod $method, $params)
    {
        $name = $method->getName();
        $args = $method->getParameters();
        if (count($args) != 1 || substr($name, 0, 3) != "set") {
            return false;
        }
        $property = strtolower(substr($name, 3));
        if ( !isset($params[$property])) {  
            return false;
        }
        $arg_class = $args[0]->getClass();
        
        if ( empty($arg_class)) {
            $method->invoke($module, $params[$property]);
        } else {
            $method->invoke($module, $arg_class->newInstance($params[$property]));
        }
    }
}
$test = new ModuleRunner();
$test->init();
?>