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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Onurb\Bundle\YumlBundle\Yuml;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\Common\Persistence\Mapping\ClassMetadata;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\Common\Persistence\Mapping\ClassMetadataFactory as ClassMetadataFactoryInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\ORM\EntityManagerInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\ORM\Mapping\ClassMetadataFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Onurb\Bundle\YumlBundle\Curl\Curl;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Onurb\Bundle\YumlBundle\Curl\CurlInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Onurb\Doctrine\ORMMetadataGrapher\YUMLMetadataGrapher as MetadataGrapher;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Onurb\Doctrine\ORMMetadataGrapher\YUMLMetadataGrapherInterface as MetadataGrapherInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Utility to generate Yuml compatible strings from metadata graphs  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Adaptation of DoctrineORMModule\Yuml\YumlController for ZendFramework-Zend-Developer-Tools  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license MIT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link    http://www.doctrine-project.org/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author  Bruno Heron <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author  Marco Pivetta <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 **/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class YumlClient implements YumlClientInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    const YUML_POST_URL = 'https://yuml.me/diagram/%STYLE%/class';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    const YUML_REDIRECT_URL = 'https://yuml.me/';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $entityManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $metadataFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $metadataGrapher;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param EntityManagerInterface $entityManager  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param ClassMetadataFactoryInterface|null $classMetadataFactory  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param MetadataGrapherInterface|null $metadataGrapher  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        EntityManagerInterface          $entityManager,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ClassMetadataFactoryInterface   $classMetadataFactory = null,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        MetadataGrapherInterface        $metadataGrapher = null  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->entityManager = $entityManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->metadataFactory = $classMetadataFactory ? $classMetadataFactory : new ClassMetadataFactory();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->metadataFactory->setEntityManager($this->entityManager);  | 
            
                            
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                        $this->metadataGrapher = $metadataGrapher ? $metadataGrapher : new MetadataGrapher();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get doctrine metadata as yuml.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param bool $showDetail  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $colors  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $notes  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function makeDslText($showDetail = false, $colors = array(), $notes = array())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->metadataGrapher->generateFromMetadata(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->getClasses(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $showDetail,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $colors,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $notes  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Use yuml.me to generate an image from yuml.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $dsl_text  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $style the yuml style plain, boring or scruffy  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $extension the file extension to redirect to  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $direction the direction of the graph (LR,RL, TB)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $scale the graph scale : huge, big, normal, small or tiny.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return string The url of the generated image.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getGraphUrl($dsl_text, $style, $extension, $direction, $scale)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $curl = new Curl($this->makePostUrl($style, $direction, $scale));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $curl->setPosts(array('dsl_text' => $dsl_text)); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return self::YUML_REDIRECT_URL . $this->makeExtensionUrl($curl->getResponse(), $extension);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $graphUrl  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $filename  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return mixed  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function downloadImage($graphUrl, $filename, CurlInterface $curl = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $curl = $curl ? $curl : new Curl($graphUrl);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $curl->setOutput($filename);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $curl->getResponse();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return ClassMetadata[]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function getMetadata()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->metadataFactory->getAllMetadata();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function getClasses()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $classes = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /** @var ClassMetadata $class */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($this->getMetadata() as $class) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $classes[$class->getName()] = $class;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ksort($classes);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $classes;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $style  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function makePostUrl($style, $direction, $scale)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return str_replace('%STYLE%', $this->makeStyle($style, $direction, $scale), self::YUML_POST_URL); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    133
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    134
                 | 
                                    
                                                     | 
                
                 | 
                     * @param string $return  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    135
                 | 
                                    
                                                     | 
                
                 | 
                     * @param string $extension  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    136
                 | 
                                    
                                                     | 
                
                 | 
                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    137
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    138
                 | 
                                    
                             1                          | 
                
                 | 
                    private function makeExtensionUrl($return, $extension)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
                             1                          | 
                
                 | 
                        return explode('.', $return)[0] . '.' . $this->checkExtension($extension); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                             1                          | 
                
                 | 
                    private function makeStyle($style, $direction, $scale)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    145
                 | 
                                    
                             1                          | 
                
                 | 
                        return $this->checkStyle($style) . $this->makeDirection($direction) . $this->makeScale($scale);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    147
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    148
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    149
                 | 
                                    
                                                     | 
                
                 | 
                     * @param string $direction  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    150
                 | 
                                    
                                                     | 
                
                 | 
                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    151
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    152
                 | 
                                    
                             1                          | 
                
                 | 
                    private function makeDirection($direction)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    153
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    154
                 | 
                                    
                             1                          | 
                
                 | 
                        switch ($direction) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    155
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'LR':  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    156
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'RL':  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    157
                 | 
                                    
                             1                          | 
                
                 | 
                                return ';dir:' . $direction;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    158
                 | 
                                    
                                                     | 
                
                 | 
                            default:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    159
                 | 
                                    
                             1                          | 
                
                 | 
                                return '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    160
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    161
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    162
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    163
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    164
                 | 
                                    
                                                     | 
                
                 | 
                     * @param string $scale  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    165
                 | 
                                    
                                                     | 
                
                 | 
                     * @return string  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    166
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    167
                 | 
                                    
                             1                          | 
                
                 | 
                    private function makeScale($scale)  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    168
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    169
                 | 
                                    
                             1                          | 
                
                 | 
                        switch ($scale) { | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    170
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'huge':  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    171
                 | 
                                    
                             1                          | 
                
                 | 
                                return ';scale:180';  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    172
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'big':  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    173
                 | 
                                    
                             1                          | 
                
                 | 
                                return ';scale:120';  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    174
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'small':  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    175
                 | 
                                    
                             1                          | 
                
                 | 
                                return ';scale:80';  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    176
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'tiny':  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    177
                 | 
                                    
                             1                          | 
                
                 | 
                                return ';scale:60';  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    178
                 | 
                                    
                                                     | 
                
                 | 
                            default:  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    179
                 | 
                                    
                             1                          | 
                
                 | 
                                return '';  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    180
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
                | 
                    181
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    182
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    183
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    184
                 | 
                                    
                                                     | 
                
                 | 
                     * @param string $extension  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    185
                 | 
                                    
                                                     | 
                
                 | 
                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    186
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    187
                 | 
                                    
                             1                          | 
                
                 | 
                    private function checkExtension($extension)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    188
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    189
                 | 
                                    
                             1                          | 
                
                 | 
                        switch ($extension) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    190
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'jpg':  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    191
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'svg':  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    192
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'pdf':  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    193
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'json':  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    194
                 | 
                                    
                             1                          | 
                
                 | 
                                return $extension;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    195
                 | 
                                    
                                                     | 
                
                 | 
                            default:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    196
                 | 
                                    
                             1                          | 
                
                 | 
                                return 'png';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    197
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    198
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    199
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    200
                 | 
                                    
                             1                          | 
                
                 | 
                    private function checkStyle($style)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    201
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    202
                 | 
                                    
                             1                          | 
                
                 | 
                        switch ($style) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    203
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'boring':  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    204
                 | 
                                    
                             1                          | 
                
                 | 
                            case 'scruffy':  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    205
                 | 
                                    
                             1                          | 
                
                 | 
                                return $style;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    206
                 | 
                                    
                                                     | 
                
                 | 
                            default:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    207
                 | 
                                    
                             1                          | 
                
                 | 
                                return 'plain';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    208
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    209
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    210
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    211
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
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: