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PercentageDiscount::applyTo()   A
last analyzed

↳ Parent: PercentageDiscount

Complexity

Conditions 1
Paths 1

Size

Total Lines 10
Code Lines 8

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
cc 1
eloc 8
nc 1
nop 2
dl 0
loc 10
rs 9.4285
c 0
b 0
f 0
1 
<?php
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/**

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * @author Rafał Muszyński <[email protected]>

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * @copyright 2015 Sourcefabric z.ú.

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * @license http://www.gnu.org/licenses/gpl-3.0.txt

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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namespace Newscoop\PaywallBundle\Discount;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Newscoop\PaywallBundle\Entity\DiscountInterface;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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/**

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * Percentage discount.

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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class PercentageDiscount extends Discount

            


            
                                                                                                            
                            
            
                                    
            
            

                
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{

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    /**

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * {@inheritdoc}

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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     */

            


            
                                                        
            
                                    
            
            

                
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    public function applyTo(DiscountableInterface $object, DiscountInterface $discount)

            


            
                                                        
            
                                    
            
            

                
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    {

            


            
                                                        
            
                                    
            
            

                
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        $modification = $this->createModification($discount);

            


            
                                                        
            
                                    
            
            

                
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        $discountAmount = $discount->getValue() * $object->getToPay();

            


            
                                                        
            
                                    
            
            

                
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        $modificationAmount = (float) ($object->getToPay() * $discount->getValue());

            


            
                                                        
            
                                    
            
            

                
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        $object->setToPay(round($object->getToPay() - $discountAmount, 2));

            


            
                                                        
            
                                    
            
            

                
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        $modification->setAmount(-$modificationAmount);

            


            
                                                        
            
                                    
            
            

                
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        $object->addModification($modification);

            


                            

                    
                        
                    
                    
                    
                    
                                                                                                    
                        

                            
                            
0 ignored issues

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            Bug
    
    
    
        introduced 
                            by 
            

        

        

            
        

        

            

                

                    
                
                
            


        

    

    

        
                        

                            
                                
                            
                        

                                        
It seems like you code against a concrete implementation and not the interface Newscoop\PaywallBundle\D...t\DiscountableInterface as the method addModification() does only exist in the following implementations of said interface: Newscoop\PaywallBundle\Entity\UserSubscription.
                                                                                                                                                                                                        

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
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


  1. Change the type-hint for the parameter:
    

    class AuthSystem
{
    public function authenticate(MyUser $user) { /* ... */ }
}

    

    

    2. 

  2. 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.'
            );
        }

    }
}

    

    

    3. 




 Note: PHP Analyzer uses reverse abstract interpretation to narrow down the types
inside the if block in such a case.


  1. Add the method to the interface:
    

    interface User
{
    /** @return string */
    public function getPassword();

    /** @return string */
    public function getDisplayName();
}

    

    

    2. 



                        

                                                    

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        $object->addDiscount($discount);

            


            
                                                        
            
                                    
            
            

                
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    }

            


            
                                                        
            
                                    
            
            

                
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}

            


            
                                                        
            
                                    
            
            

                
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