FixedDiscount::buildPrice() - Code Metrics - Inspection of "csfixed" - hiqdev/php-billing - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( eebd57...9e79a2 )

by Andrii

created 2018-05-24 15:50 UTC

FixedDiscount::buildPrice() A

↳ Parent: FixedDiscount

Complexity

Conditions	1
Paths	1

Size

Total Lines	8
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	5
CRAP Score	1

Importance

Changes

Metric	Value
dl	0
loc	8
ccs	5
cts	5
cp	1
rs	9.4285
c	0
b	0
f	0
cc	1
eloc	5
nc	1
nop	1
crap	1

<?php
/**
 * PHP Billing Library
 *
 * @link      https://github.com/hiqdev/php-billing
 * @package   php-billing
 * @license   BSD-3-Clause
 * @copyright Copyright (c) 2017-2018, HiQDev (http://hiqdev.com/)
 */

namespace hiqdev\php\billing\charge\modifiers;

use hiqdev\php\billing\action\ActionInterface;
use hiqdev\php\billing\charge\Charge;
use hiqdev\php\billing\charge\ChargeInterface;
use hiqdev\php\billing\charge\modifiers\addons\Discount;
.
|-- OtherDir
|   |-- Bar.php
|   `-- Foo.php
`-- SomeDir
    `-- Foo.php
use hiqdev\php\billing\price\SinglePrice;
use hiqdev\php\billing\target\Target;
use hiqdev\php\billing\type\Type;
use hiqdev\php\units\Quantity;
use Money\Money;

/**
 * Fixed discount.
 *
 * @author Andrii Vasyliev <[email protected]>
 */
class FixedDiscount extends Modifier
{
    const VALUE = 'value';

    public function __construct($value, array $addons = [])
    {
        parent::__construct($addons);
        $this->addAddon(self::VALUE, new Discount($value));
    }

    public function getNext()
    {
        return $this;
    }

    public function getValue(ChargeInterface $charge = null): Discount
    {
        return $this->getAddon(self::VALUE);
    }

    public function isAbsolute()
    {
        return $this->getAddon(self::VALUE)->isAbsolute();
interface User
{
    /** @return string */
    public function getPassword();
}

class MyUser implements User
{
    public function getPassword()
    {
        // return something
    }

    public function getDisplayName()
    {
        // return some name.
    }
}

class AuthSystem
{
    public function authenticate(User $user)
    {
        $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName()));
        // do something.
    }
}
    }

    public function isRelative()
    {
        return !$this->isAbsolute();
    }

    public function calculateSum(ChargeInterface $charge = null): Money
    {
        return $this->getValue($charge)->calculateSum($charge);
function notNullable(stdClass $x) { }

// Unsafe
function withoutCheck(stdClass $x = null) {
    notNullable($x);
}

// Safe - Alternative 1: Adding Additional Type-Check
function withCheck(stdClass $x = null) {
    if ($x instanceof stdClass) {
        notNullable($x);
    }
}

// Safe - Alternative 2: Changing Parameter
function withNonNullableParam(stdClass $x) {
    notNullable($x);
}
    }

    public function buildPrice(Money $sum)
    {
        $type = $this->getType();
        $target = $this->getTarget();
        $prepaid = Quantity::items(0);

        return new SinglePrice(null, $type, $target, null, $prepaid, $sum);
    }

    public function getType()
    {
        return new Type(Type::ANY, 'discount');
    }

    public function getTarget()
    {
        return new Target(Target::ANY, Target::ANY);
    }

    public function modifyCharge(?ChargeInterface $charge, ActionInterface $action): array
    {
        if ($charge === null) {
            return [];
        }

        if (!$this->isSuitable($charge, $action)) {
            return [$charge];
        }

        $sum = $this->calculateSum($charge);
        $usage  = Quantity::items(1);
        $price = $this->buildPrice($sum);
        $discount = new Charge(null, $action, $price, $usage, $sum);
        $reason = $this->getReason();
        if ($reason) {
            $discount->setComment($reason->getValue());
        }

        return [$charge, $discount];
    }
}


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) 2017-2018, HiQDev (http://hiqdev.com/)
9		*/
10
11		namespace hiqdev\php\billing\charge\modifiers;
12
13		use hiqdev\php\billing\action\ActionInterface;
14		use hiqdev\php\billing\charge\Charge;
15		use hiqdev\php\billing\charge\ChargeInterface;
16		use hiqdev\php\billing\charge\modifiers\addons\Discount;
		0 ignored issues – show Bug introduced 2018-05-18 16:35 UTC by Report Bug Copy Issue Report This use statement conflicts with another class in this namespace, `hiqdev\php\billing\charge\modifiers\Discount`. Let’s assume that you have a directory layout like this: . \|-- OtherDir \| \|-- Bar.php \| `-- Foo.php `-- SomeDir `-- Foo.php and let’s assume the following content of `Bar.php`: // Bar.php namespace OtherDir; use SomeDir\Foo; // This now conflicts the class OtherDir\Foo If both files `OtherDir/Foo.php` and `SomeDir/Foo.php` are loaded in the same runtime, you will see a PHP error such as the following: PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.php However, as `OtherDir/Foo.php` does not necessarily have to be loaded and the error is only triggered if it is loaded before `OtherDir/Bar.php`, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: // Bar.php namespace OtherDir; use SomeDir\Foo as SomeDirFoo; // There is no conflict anymore. Loading history...
17		use hiqdev\php\billing\price\SinglePrice;
18		use hiqdev\php\billing\target\Target;
19		use hiqdev\php\billing\type\Type;
20		use hiqdev\php\units\Quantity;
21		use Money\Money;
22
23		/**
24		* Fixed discount.
25		*
26		* @author Andrii Vasyliev <[email protected]>
27		*/
28		class FixedDiscount extends Modifier
29		{
30		const VALUE = 'value';
31
32	6	public function __construct($value, array $addons = [])
33		{
34	6	parent::__construct($addons);
35	6	$this->addAddon(self::VALUE, new Discount($value));
36	6	}
37
38	11	public function getNext()
39		{
40	11	return $this;
41		}
42
43	5	public function getValue(ChargeInterface $charge = null): Discount
44		{
45	5	return $this->getAddon(self::VALUE);
46		}
47
48	3	public function isAbsolute()
49		{
50	3	return $this->getAddon(self::VALUE)->isAbsolute();
		0 ignored issues – show Bug introduced 2018-05-23 08:23 UTC by Report Bug Copy Issue Report It seems like you code against a concrete implementation and not the interface `hiqdev\php\billing\charge\modifiers\AddonInterface` as the method `isAbsolute()` does only exist in the following implementations of said interface: `hiqdev\php\billing\charg...difiers\addons\Discount`, `hiqdev\php\billing\charg...difiers\addons\Extremum`, `hiqdev\php\billing\charge\modifiers\addons\Maximum`, `hiqdev\php\billing\charge\modifiers\addons\Minimum`, `hiqdev\php\billing\charge\modifiers\addons\Step`. Let’s take a look at an example: interface User { /** @return string / public function getPassword(); } class MyUser implements User { public function getPassword() { // return something } public function getDisplayName() { // return some name. } } class AuthSystem { public function authenticate(User $user) { $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName())); // do something. } } In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break. Available Fixes Change the type-hint for the parameter: class AuthSystem { public function authenticate(MyUser $user) { / ... / } } Add an additional type-check: class AuthSystem { public function authenticate(User $user) { if ($user instanceof MyUser) { $this->logger->info(/* ... /); } // or alternatively if ( ! $user instanceof MyUser) { throw new \LogicException( '$user must be an instance of MyUser, ' .'other instances are not supported.' ); } } } Note:* PHP Analyzer uses reverse abstract interpretation to narrow down the types inside the if block in such a case. Add the method to the interface: interface User { /** @return string / public function getPassword(); /* @return string */ public function getDisplayName(); } Loading history...
51		}
52
53	5	public function isRelative()
54		{
55	5	return !$this->isAbsolute();
56		}
57
58	4	public function calculateSum(ChargeInterface $charge = null): Money
59		{
60	4	return $this->getValue($charge)->calculateSum($charge);
		0 ignored issues – show Bug introduced 2018-05-22 08:01 UTC by Report Bug Copy Issue Report It seems like `$charge` defined by parameter `$charge` on line `58` can be `null`; however, `hiqdev\php\billing\charg...iscount::calculateSum()` does not accept `null`, maybe add an additional type check? It seems like you allow that null is being passed for a parameter, however the function which is called does not seem to accept null. We recommend to add an additional type check (or disallow null for the parameter): function notNullable(stdClass $x) { } // Unsafe function withoutCheck(stdClass $x = null) { notNullable($x); } // Safe - Alternative 1: Adding Additional Type-Check function withCheck(stdClass $x = null) { if ($x instanceof stdClass) { notNullable($x); } } // Safe - Alternative 2: Changing Parameter function withNonNullableParam(stdClass $x) { notNullable($x); } Loading history...
61		}
62
63	4	public function buildPrice(Money $sum)
64		{
65	4	$type = $this->getType();
66	4	$target = $this->getTarget();
67	4	$prepaid = Quantity::items(0);
68
69	4	return new SinglePrice(null, $type, $target, null, $prepaid, $sum);
70		}
71
72	4	public function getType()
73		{
74	4	return new Type(Type::ANY, 'discount');
75		}
76
77	4	public function getTarget()
78		{
79	4	return new Target(Target::ANY, Target::ANY);
80		}
81
82	4	public function modifyCharge(?ChargeInterface $charge, ActionInterface $action): array
83		{
84	4	if ($charge === null) {
85		return [];
86		}
87
88	4	if (!$this->isSuitable($charge, $action)) {
89		return [$charge];
90		}
91
92	4	$sum = $this->calculateSum($charge);
93	4	$usage = Quantity::items(1);
94	4	$price = $this->buildPrice($sum);
95	4	$discount = new Charge(null, $action, $price, $usage, $sum);
96	4	$reason = $this->getReason();
97	4	if ($reason) {
98		$discount->setComment($reason->getValue());
99		}
100
101	4	return [$charge, $discount];
102		}
103		}
104

hiqdev / php-billing

Push — master ( eebd57...9e79a2 )

FixedDiscount::buildPrice() A

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