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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace HDNET\Calendarize\ViewHelpers\Link;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use TYPO3\CMS\Extbase\Mvc\Web\Routing\UriBuilder;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class AbstractActionViewHelper extends AbstractLinkViewHelper  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected $extensionName = 'Calendarize';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected $pluginName = 'Calendar';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected $controllerName = 'Calendar';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected $actionName;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function initializeArguments()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::initializeArguments();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->registerArgument('section', 'string', 'The anchor to be added to the URI', false); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->registerArgument('pageUid', 'int', 'Target page', false); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->registerArgument('absolute', 'bool', 'If set, the URI of the rendered link is absolute', false); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * Render a link with action and controller.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param array $controllerArguments  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param null  $pageUid  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return mixed|string  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function renderExtbaseLink(array $controllerArguments = [], $pageUid = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $absolute = $this->arguments['absolute'] ?? false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $pageUid = $pageUid ?? $this->getPageUid($this->arguments['pageUid'] ?? '');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $section = $this->arguments['section'] ?? '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /** @var UriBuilder $uriBuilder */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $uriBuilder = $this->renderingContext->getControllerContext()->getUriBuilder();  | 
            
                            
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                        // $uriBuilder = $this->renderingContext->getUriBuilder(); // Typo3 11 and later  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->lastHref = $uriBuilder->reset()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->setTargetPageUid($pageUid)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->setSection($section)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->setCreateAbsoluteUri($absolute)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->uriFor(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->actionName,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $controllerArguments,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->controllerName,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->extensionName,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->pluginName  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ('' !== $this->lastHref) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->tag->addAttribute('href', $this->lastHref); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->tag->setContent($this->renderChildren());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->tag->forceClosingTag(true);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $result = $this->tag->render();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $result = $this->renderChildren();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $result;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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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: