View GitHub Repository PhpDesignPatterns-ChainOfResponsibility

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Pull Request — master (#3)
by Korotkov
04:08
created

AbstractHandler   A

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Complexity

Total Complexity 4

Size/Duplication

Total Lines 31
Duplicated Lines 0 %

Importance

Changes 0
Metric Value
wmc 4
dl 0
loc 31
rs 10
c 0
b 0
f 0

2 Methods

Rating   Name   Duplication   Size   Complexity  
A __invoke() 0 5 1
A next() 0 9 3
1 
<?php
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declare(strict_types=1);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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/**

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * @author    : Korotkov Danila <[email protected]>

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * @license   https://mit-license.org/ MIT

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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namespace Behavioral\ChainOfResponsibility;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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/**

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * Class AbstractHandler

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * @package Behavioral\ChainOfResponsibility

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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 */

            


            
                                                                        
                            
            
                                    
            
            

                
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abstract class AbstractHandler

            


            
                                                                        
                            
            
                                    
            
            

                
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{

            


            
                                                                        
                            
            
                                    
            
            

                
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    /**

            


            
                                                                        
                            
            
                                    
            
            

                
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     * AbstractHandler constructor.

            


            
                                                                        
                            
            
                                    
            
            

                
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     * @param int   $count

            


            
                                                                        
                            
            
                                    
            
            

                
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     * @param array $chain

            


            
                                                                        
                            
            
                                    
            
            

                
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     */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function __invoke(int $count, array $chain)

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        array_shift($chain);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $this->request();

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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        $this->next($count - 1, $chain);

            


            
                                                                        
                            
            
                                    
            
            

                
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    }

            


            
                                                                        
                            
            
                                    
            
            

                
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    /**

            


            
                                                                        
                            
            
                                    
            
            

                
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     * @param int   $count

            


            
                                                                        
                            
            
                                    
            
            

                
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     * @param array $chain

            


            
                                                                        
                            
            
                                    
            
            

                
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     */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    protected function next(int $count, array $chain): void

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        if (!($count and count($chain))) {

            


                            

                    
                        
                    
                    
                    
                    
                                                                                                    
                        

                            
                            
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            Comprehensibility
            Best Practice
    
    
    
        introduced 
                            by 
            

        

        

            
        

        

            

                

                    
                
                
            


        

    

    

        
                        

                            
                                
                            
                        

                                        
Using logical operators such as and instead of && is generally not recommended.
                                                                                                                                                    

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
PHP has two types of connecting operators (logical operators, and boolean operators):


 
Logical Operators
Boolean Operator

AND - meaning
and
&&

OR - meaning
or
||

The difference between these is the order in which they are executed. In most cases,
you would want to use a boolean operator like &&, or ||.


Let’s take a look at a few examples:


// Logical operators have lower precedence:
$f = false or true;

// is executed like this:
($f = false) or true;


// Boolean operators have higher precedence:
$f = false || true;

// is executed like this:
$f = (false || true);







Logical Operators are used for Control-Flow


One case where you explicitly want to use logical operators is for control-flow
such as this:


$x === 5
    or die('$x must be 5.');

// Instead of
if ($x !== 5) {
    die('$x must be 5.');
}





Since die introduces problems of its own, f.e. it makes our code hardly
testable, and prevents any kind of more sophisticated error handling; you probably
do not want to use this in real-world code. Unfortunately, logical operators
cannot be combined with throw at this point:


// The following is currently a parse error.
$x === 5
    or throw new RuntimeException('$x must be 5.');





These limitations lead to logical operators rarely being of use in current
PHP code.




                        

                                                    

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            printf(PHP_EOL);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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            return;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $nextChain = new $chain[0] ?? new $chain;

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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        $nextChain($count, $chain);

            


            
                                                        
            
                                    
            
            

                
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    }

            


            
                                                        
            
                                    
            
            

                
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    abstract public function request();

            


            
                                                        
            
                                    
            
            

                
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}

            


            
                                                        
            
                                    
            
            

                
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