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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace CultuurNet\UDB3\Label;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use CultuurNet\UDB3\Label\Specifications\LabelEventIsOfEventType;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use CultuurNet\UDB3\Label\Specifications\LabelEventIsOfOrganizerType;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use CultuurNet\UDB3\Label\Specifications\LabelEventIsOfPlaceType;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use CultuurNet\UDB3\Label\ValueObjects\RelationType;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use CultuurNet\UDB3\Offer\Events\AbstractLabelEvent as EventAbstractLabelEvent;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use CultuurNet\UDB3\Organizer\Events\AbstractLabelEvent as OrganizerAbstractLabelEvent;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class LabelEventRelationTypeResolver implements LabelEventRelationTypeResolverInterface  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @var LabelEventIsOfEventType  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private $eventTypeSpecification;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @var LabelEventIsOfPlaceType  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private $placeTypeSpecification;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @var LabelEventIsOfOrganizerType  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private $organizerTypeSpecification;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function __construct()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->eventTypeSpecification = new LabelEventIsOfEventType();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->placeTypeSpecification = new LabelEventIsOfPlaceType();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->organizerTypeSpecification = new LabelEventIsOfOrganizerType();  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param EventAbstractLabelEvent|OrganizerAbstractLabelEvent $labelEvent  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return RelationType  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @throws \InvalidArgumentException  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getRelationType($labelEvent)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->eventTypeSpecification->isSatisfiedBy($labelEvent)) { | 
            
                            
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                            $relationType = RelationType::EVENT();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else if ($this->placeTypeSpecification->isSatisfiedBy($labelEvent)) { | 
            
                            
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                            $relationType = RelationType::PLACE();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else if ($this->organizerTypeSpecification->isSatisfiedBy($labelEvent)) { | 
            
                            
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                            $relationType = RelationType::ORGANIZER();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $message = $this->createIllegalArgumentMessage($labelEvent);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new \InvalidArgumentException($message);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $relationType;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param EventAbstractLabelEvent|OrganizerAbstractLabelEvent $labelEvent  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function createIllegalArgumentMessage($labelEvent)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return 'Event with type ' . get_class($labelEvent) . ' can not be converted to a relation type!';  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This check looks at variables that have been passed in as parameters and are passed out again to other methods.
If the outgoing method call has stricter type requirements than the method itself, an issue is raised.
An additional type check may prevent trouble.