php门面模式(facade pattern)

Posted 2022-04-10 aguncn

书上不全的代码，我自己补全的。

<?php
/*
The facade pattern is used when we want to simplify the complexities of large
systems through a simpler interface. It does so by providing convenient methods
for most common tasks, through a single wrapper class used by a client.
*/

class Product 
    private $qty = null;
    
    public function __construct($qty) 
        $this->qty = $qty;
    
    
    public function getQty() 
        echo ‘Product_getQty<br/>‘;
        return $this->qty;
    


class QuickOrderFacade 
    private $product = null;
    private $orderQty = null;
    
    public function __construct($product, $orderQty) 
        $this->product = $product;
        $this->orderQty = $orderQty;
    
    
    public function generateOrder() 
        if ($this->qtyCheck()) 
            $this->addToCart();
            $this->calculateShipping();
            $this->applyDiscount();
            $this->placeOrder();
        
    
    
    private function addToCart() 
        echo ‘QuickOrderFacade_addToCart<br/>‘;
    
    
    private function qtyCheck() 
        if ($this->product->getQty() > $this->orderQty) 
            return true;
         else 
            return false;
        
    
    
    private function calculateShipping() 
        echo ‘QuickOrderFacade_calculateShipping<br/>‘;
    
    
    private function applyDiscount() 
        echo ‘QuickOrderFacade_applyDiscount<br/>‘;
    
    
    private function placeOrder() 
        echo ‘QuickOrderFacade_placeOrder<br/>‘;
    


$order = new QuickOrderFacade(new Product(8), 6);
$order->generateOrder();
?>