AbstractPrice::calculateUsage()

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by Andrii

created 2017-06-06 07:31 UTC

↳ Parent: AbstractPrice

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<?php
/**
 * PHP Billing Library
 *
 * @link      https://github.com/hiqdev/php-billing
 * @package   php-billing
 * @license   BSD-3-Clause
 * @copyright Copyright (c) 2017, HiQDev (http://hiqdev.com/)
 */

namespace hiqdev\php\billing;

use hiqdev\php\units\QuantityInterface;

/**
 * Price.
 * @see PriceInterface
 *
 * @author Andrii Vasyliev <[email protected]>
 */
abstract class AbstractPrice implements PriceInterface, EntityInterface
{
    /**
     * @var integer
     */
    protected $id;

    /**
     * @var Target
     */
    protected $target;

    /**
     * @var Type
     */
    protected $type;

    public function __construct($id, TargetInterface $target, TypeInterface $type)
    {
        $this->id = $id;
        $this->target = $target;

        $this->type = $type;
class Alien {}

class Dalek extends Alien {}

class Plot
{
    /** @var  Dalek */
    public $villain;
}

$alien = new Alien();
$plot = new Plot();
if ($alien instanceof Dalek) {
    $plot->villain = $alien;
}
    }

    /**
     * {@inheritdoc}
     */
    public function getTarget()
    {
        return $this->target;
class Author {
    private $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}
    }

    /**
     * {@inheritdoc}
     */
    public function getType()
    {
        return $this->type;
    }

    /**
     * {@inheritdoc}
     * Default sum calculation method: sum = price * usage.
     */
    public function calculateSum(QuantityInterface $quantity)
    {
        $usage = $this->calculateUsage($quantity);
        if ($usage === null) {
            return null;
        }

        $price = $this->calculatePrice($quantity);
        if ($price === null) {
            return null;
        }

        return $price->multiply($usage->getQuantity());
    }

    public static function create(array $data)
    {
        return new SinglePrice($data['id'], $data['target']);

    }

    public function jsonSerialize()
    {
        return [
            'id' => $this->id,
            'type' => $this->type,
            'target' => $this->target,
        ];
    }

    /**
     * {@inheritdoc}
     */
    abstract public function calculateUsage(QuantityInterface $quantity);

    /**
     * {@inheritdoc}
     */
    abstract public function calculatePrice(QuantityInterface $action);
}


1			<?php
2			/**
3			* PHP Billing Library
4			*
5			* @link https://github.com/hiqdev/php-billing
6			* @package php-billing
7			* @license BSD-3-Clause
8			* @copyright Copyright (c) 2017, HiQDev (http://hiqdev.com/)
9			*/
10
11			namespace hiqdev\php\billing;
12
13			use hiqdev\php\units\QuantityInterface;
14
15			/**
16			* Price.
17			* @see PriceInterface
18			*
19			* @author Andrii Vasyliev <[email protected]>
20			*/
21			abstract class AbstractPrice implements PriceInterface, EntityInterface
22			{
23			/**
24			* @var integer
25			*/
26			protected $id;
27
28			/**
29			* @var Target
30			*/
31			protected $target;
32
33			/**
34			* @var Type
35			*/
36			protected $type;
37
38			public function __construct($id, TargetInterface $target, TypeInterface $type)
39			{
40			$this->id = $id;
41			$this->target = $target;
			0 ignored issues – show Documentation Bug introduced 2017-06-06 07:34 UTC by Report Bug Copy Issue Report It seems like `$target` of type `object<hiqdev\php\billing\TargetInterface>` is incompatible with the declared type `object<hiqdev\php\billing\Target>` of property `$target`. Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property. Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property.. Loading history...
42			$this->type = $type;
			0 ignored issues – show Documentation Bug introduced 2017-04-01 18:18 UTC by Report Bug Copy Issue Report `$type` is of type `object<hiqdev\php\billing\TypeInterface>`, but the property `$type` was declared to be of type `object<hiqdev\php\billing\Type>`. Are you sure that you always receive this specific sub-class here, or does it make sense to add an `instanceof` check? Our type inference engine has found a suspicous assignment of a value to a property. This check raises an issue when a value that can be of a given class or a super-class is assigned to a property that is type hinted more strictly. Either this assignment is in error or an instanceof check should be added for that assignment. class Alien {} class Dalek extends Alien {} class Plot { /** @var Dalek */ public $villain; } $alien = new Alien(); $plot = new Plot(); if ($alien instanceof Dalek) { $plot->villain = $alien; } Loading history...
43			}
44
45			/**
46			* {@inheritdoc}
47			*/
48			public function getTarget()
49			{
50			return $this->target;
			0 ignored issues – show Bug Best Practice introduced 2017-03-29 15:24 UTC by Report Bug Copy Issue Report The return type of `return $this->target;` (`hiqdev\php\billing\Target`) is incompatible with the return type declared by the interface `hiqdev\php\billing\PriceInterface::getTarget` of type `hiqdev\php\billing\TargetInterface`. If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design. Let’s take a look at an example: class Author { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } abstract class Post { public function getAuthor() { return 'Johannes'; } } class BlogPost extends Post { public function getAuthor() { return new Author('Johannes'); } } class ForumPost extends Post { /* ... */ } function my_function(Post $post) { echo strtoupper($post->getAuthor()); } Our function `my_function` expects a `Post` object, and outputs the author of the post. The base class `Post` returns a simple string and outputting a simple string will work just fine. However, the child class `BlogPost` which is a sub-type of `Post` instead decided to return an `object`, and is therefore violating the SOLID principles. If a `BlogPost` were passed to `my_function`, PHP would not complain, but ultimately fail when executing the `strtoupper` call in its body. Loading history...
51			}
52
53			/**
54			* {@inheritdoc}
55			*/
56			public function getType()
57			{
58			return $this->type;
59			}
60
61			/**
62			* {@inheritdoc}
63			* Default sum calculation method: sum = price * usage.
64			*/
65			public function calculateSum(QuantityInterface $quantity)
66			{
67			$usage = $this->calculateUsage($quantity);
68			if ($usage === null) {
69			return null;
70			}
71
72			$price = $this->calculatePrice($quantity);
73			if ($price === null) {
74			return null;
75			}
76
77			return $price->multiply($usage->getQuantity());
78			}
79
80			public static function create(array $data)
81			{
82			return new SinglePrice($data['id'], $data['target']);
			0 ignored issues – show Bug introduced 2017-05-29 09:46 UTC by Report Bug Copy Issue Report The call to `SinglePrice::__construct()` misses some required arguments starting with `$type`. Loading history...
83			}
84
85			public function jsonSerialize()
86			{
87			return [
88			'id' => $this->id,
89			'type' => $this->type,
90			'target' => $this->target,
91			];
92			}
93
94			/**
95			* {@inheritdoc}
96			*/
97			abstract public function calculateUsage(QuantityInterface $quantity);
98
99			/**
100			* {@inheritdoc}
101			*/
102			abstract public function calculatePrice(QuantityInterface $action);
103			}
104

hiqdev / php-billing

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AbstractPrice::calculateUsage()

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