designpatterns/decorator.php at master · nahidacm/designpatterns · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
<?php
interface iProduct
{
    public function setPrice();
    public function getPrice();
}

class Product implements iProduct
{
    protected $_product;
    protected $_price;
    protected $_size;
    protected $_weight;

    public function __construct($price)
    {
        $this->_price = $price;
        $this->_size = 5;
        $this->_weight = 5;
    }

    public function setPrice(){}

    public function getPrice(){
        return $this->_price;
    }
}

class ProdWithVat extends Product
{

    public function __construct(Product $product)
    {
        $this->_product = $product;
        $this->setPrice();
    }

    public function setPrice()
    {
        $price = $this->_product->getPrice();
        $this->_price = $price + $this->getVat();
    }

    public function getVat(){
        //5% tax
        return ($this->_product->getPrice()*5)/100;
    }
}

class ProdWithShippingCost extends Product
{

    public function __construct(Product $product)
    {
        $this->_product = $product;
        $this->setPrice();
    }

    public function setPrice()
    {
        $price = $this->_product->getPrice();
        $this->_price = $price + $this->getShippingCost();
    }

    public function getShippingCost(){
        return $this->_product->getPrice() + $this->_size + $this->_weight;
    }
}

class ProdWithDiscount extends Product
{

    public function __construct(Product $product)
    {
        $this->_product = $product;
        $this->setPrice();
    }

    public function setPrice()
    {
        $price = $this->_product->getPrice();
        $this->_price = $price - $this->getDiscount();
    }

    public function getDiscount(){
        return 2;
    }
}

$product = new Product(10);
echo "Standard Product Price: ".$product->getPrice();

$productWithVat = new ProdWithVat($product);
echo "<br/>Price After addind 5% VAT: ".$productWithVat->getPrice();

$productWithShipping = new ProdWithShippingCost($productWithVat);
echo "<br/>Price After addind Shipping Cost: ".$productWithShipping->getPrice();


$productWithDiscount = new ProdWithShippingCost(new ProdWithVat(new ProdWithDiscount($product)));
echo '<br/><br/>Final Price after discount: '.$productWithDiscount->getPrice();