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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Wikibase\DataModel\Services\Diff;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Wikibase\DataModel\Term\AliasGroup;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Wikibase\DataModel\Term\Fingerprint;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license GPL-2.0-or-later  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Jeroen De Dauw < [email protected] >  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class FingerprintDiffer { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param Fingerprint $first  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param Fingerprint $second  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return Fingerprint Contains the terms present in $first that are not present in $second  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function diff( Fingerprint $first, Fingerprint $second ): Fingerprint { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$difference = new Fingerprint();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		foreach ( $first->getLabels() as $term ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			if ( !$second->getLabels()->hasTerm( $term ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$difference->getLabels()->setTerm( $term );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		foreach ( $first->getDescriptions() as $term ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			if ( !$second->getDescriptions()->hasTerm( $term ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$difference->getDescriptions()->setTerm( $term );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		foreach ( $first->getAliasGroups() as $aliasGroup ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$difference->setAliasGroup(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$aliasGroup->getLanguageCode(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$this->diffAliasGroup( $aliasGroup, $second )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $difference;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	private function diffAliasGroup( AliasGroup $aliasGroup, Fingerprint $second ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                		if ( $second->hasAliasGroup( $aliasGroup->getLanguageCode() ) ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                			$secondAliases = $second->getAliasGroup( $aliasGroup->getLanguageCode() )->getAliases();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			$differenceAliases = [];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			foreach ( $aliasGroup->getAliases() as $aliasText ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                				if ( !in_array( $aliasText, $secondAliases ) ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                					$differenceAliases[] = $aliasText;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                				}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			return $differenceAliases;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		return $aliasGroup->getAliases();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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