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Push — master ( 3b9db0...fc649a )
by Flo
03:08
created

ControllerFactory   A

↳ Parent: Project

Complexity

Total Complexity 1

Size/Duplication

Total Lines 17
Duplicated Lines 0 %

Coupling/Cohesion

Components 0
Dependencies 2

Importance

Changes 0
Metric Value
wmc 1
lcom 0
cbo 2
dl 0
loc 17
rs 10
c 0
b 0
f 0

1 Method

Rating   Name   Duplication   Size   Complexity  
A createService() 0 7 1
1 
<?php
2 

            


            
                                                                                                            
                            
            
                                    
            
            

                
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namespace Faulancer\Controller\Factory;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Faulancer\Controller\Controller;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Faulancer\Http\Request;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Faulancer\ServiceLocator\FactoryInterface;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Faulancer\ServiceLocator\ServiceLocatorInterface;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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/**

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * Class AbstractControllerFactory

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 *

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * @category Controller

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * @package  Faulancer\Factory\AbstractControllerFactory

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * @author   Florian Knapp <[email protected]>

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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 */

            


            
                                                                        
                            
            
                                    
            
            

                
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class ControllerFactory implements FactoryInterface

            


            
                                                                        
                            
            
                                    
            
            

                
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{

            


            
                                                                        
                            
            
                                    
            
            

                
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    /**

            


            
                                                                        
                            
            
                                    
            
            

                
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     * @param ServiceLocatorInterface $serviceLocator

            


            
                                                                        
                            
            
                                    
            
            

                
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     *

            


            
                                                                        
                            
            
                                    
            
            

                
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     * @return Controller

            


            
                                                                        
                            
            
                                    
            
            

                
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     */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function createService(ServiceLocatorInterface $serviceLocator)

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        /** @var Request $request */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $request = $serviceLocator->get(Request::class);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        return new Controller($request);

            


                            

                    
                        
                    
                    
                    
                    
                                                                                                    
                        

                            
                            
0 ignored issues

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            Bug
            Best Practice
    
    
    
        introduced 
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The return type of return new \Faulancer\Co...r\Controller($request); (Faulancer\Controller\Controller) is incompatible with the return type declared by the interface Faulancer\ServiceLocator...nterface::createService of type Faulancer\ServiceLocator\ServiceInterface.
                                                                                                                                                                                                                                                                                                                

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
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.


                        

                                                    

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    }

            


            
                                                        
            
                                    
            
            

                
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}