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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Http\Discovery\Strategy;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Http\Discovery\ClassDiscovery;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Http\Discovery\Exception\PuliUnavailableException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Puli\Discovery\Api\Discovery;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Puli\GeneratedPuliFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Find candidates using Puli.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @internal  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @final  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author David de Boer <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Márk Sági-Kazár <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class PuliBetaStrategy implements DiscoveryStrategy  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var GeneratedPuliFactory  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected static $puliFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var Discovery  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected static $puliDiscovery;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return GeneratedPuliFactory  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws PuliUnavailableException  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private static function getPuliFactory()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (null === self::$puliFactory) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            if (!defined('PULI_FACTORY_CLASS')) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                throw new PuliUnavailableException('Puli Factory is not available'); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $puliFactoryClass = PULI_FACTORY_CLASS;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            if (!ClassDiscovery::safeClassExists($puliFactoryClass)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                throw new PuliUnavailableException('Puli Factory class does not exist'); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            self::$puliFactory = new $puliFactoryClass();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return self::$puliFactory;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Returns the Puli discovery layer.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Discovery  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws PuliUnavailableException  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static function getPuliDiscovery()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!isset(self::$puliDiscovery)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $factory = self::getPuliFactory();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $repository = $factory->createRepository();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            self::$puliDiscovery = $factory->createDiscovery($repository);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return self::$puliDiscovery;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public static function getCandidates($type)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $returnData = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $bindings = self::getPuliDiscovery()->findBindings($type);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($bindings as $binding) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $condition = true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($binding->hasParameterValue('depends')) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $condition = $binding->getParameterValue('depends'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $returnData[] = ['class' => $binding->getClassName(), 'condition' => $condition];  | 
            
                            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $returnData;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
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:
Add an additional type-check:
Add the method to the interface: