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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This file is part of EC-CUBE  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Copyright(c) EC-CUBE CO.,LTD. All Rights Reserved.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * http://www.ec-cube.co.jp/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * For the full copyright and license information, please view the LICENSE  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * file that was distributed with this source code.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Eccube\Service\PurchaseFlow\Processor;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Eccube\Entity\ItemHolderInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Eccube\Entity\Master\OrderStatus;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Eccube\Entity\ProductClass;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Eccube\Entity\ProductStock;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Eccube\Repository\ProductClassRepository;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Eccube\Service\PurchaseFlow\ItemHolderValidator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Eccube\Service\PurchaseFlow\PurchaseContext;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Eccube\Service\PurchaseFlow\PurchaseException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Eccube\Service\PurchaseFlow\PurchaseProcessor;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * 編集前/編集後の個数の差分にもとづいて在庫を更新します.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class StockDiffProcessor extends ItemHolderValidator implements PurchaseProcessor  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var ProductClassRepository  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $productClassRepository;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * StockProcessor constructor.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param ProductClassRepository $productClassRepository  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(ProductClassRepository $productClassRepository)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->productClassRepository = $productClassRepository;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param ItemHolderInterface $itemHolder  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param PurchaseContext $context  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws \Eccube\Service\PurchaseFlow\InvalidItemException  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function validate(ItemHolderInterface $itemHolder, PurchaseContext $context)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (is_null($context->getOriginHolder())) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $From = $context->getOriginHolder();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $To = $itemHolder;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $diff = $this->getDiffOfQuantities($From, $To);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        foreach ($diff as $id => $quantity) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            /** @var ProductClass $ProductClass */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $ProductClass = $this->productClassRepository->find($id);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            if ($ProductClass->isStockUnlimited()) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                continue;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $stock = $ProductClass->getStock();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $Items = $To->getProductOrderItems();  | 
            
                            
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                            $Items = array_filter($Items, function ($Item) use ($id) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                return $Item->getProductClass()->getId() == $id;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            });  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $toQuantity = array_reduce($Items, function ($quantity, $Item) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                return $quantity += $Item->getQuantity();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }, 0);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            // ステータスをキャンセルに変更した場合  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            if ($To->getOrderStatus() && $To->getOrderStatus()->getId() == OrderStatus::CANCEL  | 
            
                            
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                                && $From->getOrderStatus() && $From->getOrderStatus()->getId() != OrderStatus::CANCEL) { | 
            
            
                                                                        
                            
            
                                                                    
                                                                                                        
            
            
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                                if ($stock + $toQuantity < 0) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    $this->throwInvalidItemException(trans('purchase_flow.over_stock', ['%name%' => $ProductClass->formattedProductName()])); | 
            
            
                                                                        
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            // ステータスをキャンセルから対応中に変更した場合  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            } elseif ($To->getOrderStatus() && $To->getOrderStatus()->getId() == OrderStatus::IN_PROGRESS  | 
            
                            
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                                && $From->getOrderStatus() && $From->getOrderStatus()->getId() == OrderStatus::CANCEL) { | 
            
            
                                                                        
                            
            
                                                                    
                                                                                                        
            
            
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                                if ($stock - $toQuantity < 0) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    $this->throwInvalidItemException(trans('purchase_flow.over_stock', ['%name%' => $ProductClass->formattedProductName()])); | 
            
            
                                                                        
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                        
                            
            
                                                                    
                                                                                                        
            
            
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                            } else { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                if ($stock - $quantity < 0) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    $this->throwInvalidItemException(trans('purchase_flow.over_stock', ['%name%' => $ProductClass->formattedProductName()])); | 
            
            
                                                                        
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                             156                          | 
                
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function getDiffOfQuantities(ItemHolderInterface $From, ItemHolderInterface $To)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $FromItems = $this->getQuantityByProductClass($From);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $ToItems = $this->getQuantityByProductClass($To);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $ids = array_unique(array_merge(array_keys($FromItems), array_keys($ToItems)));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $diff = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($ids as $id) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            // 更新された明細  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (isset($FromItems[$id]) && isset($ToItems[$id])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                // 2 -> 3 = +1  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                // 2 -> 1 = -1  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $diff[$id] = $ToItems[$id] - $FromItems[$id];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            } // 削除された明細  | 
            
            
                                                                                                            
                            
            
                                                                    
                                                                                                        
            
            
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                            elseif (isset($FromItems[$id]) && empty($ToItems[$id])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                // 2 -> 0 = -2  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $diff[$id] = $FromItems[$id] * -1;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            } // 追加された明細  | 
            
            
                                                                                                            
                            
            
                                                                    
                                                                                                        
            
            
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                             156                          | 
                
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                            elseif (!isset($FromItems[$id]) && isset($ToItems[$id])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                // 0 -> 2 = +2  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $diff[$id] = $ToItems[$id];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $diff;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function getQuantityByProductClass(ItemHolderInterface $ItemHolder)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $ItemsByProductClass = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    128
                 | 
                                    
                                                     | 
                
                 | 
                        foreach ($ItemHolder->getItems() as $Item) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    129
                 | 
                                    
                                                     | 
                
                 | 
                            if ($Item->isProduct()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    130
                 | 
                                    
                             156                          | 
                
                 | 
                                $id = $Item->getProductClass()->getId();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    131
                 | 
                                    
                                                     | 
                
                 | 
                                if (isset($ItemsByProductClass[$id])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    132
                 | 
                                    
                                                     | 
                
                 | 
                                    $ItemsByProductClass[$id] += $Item->getQuantity();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    133
                 | 
                                    
                                                     | 
                
                 | 
                                } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    134
                 | 
                                    
                                                     | 
                
                 | 
                                    $ItemsByProductClass[$id] = $Item->getQuantity();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    135
                 | 
                                    
                                                     | 
                
                 | 
                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    136
                 | 
                                    
                                                     | 
                
                 | 
                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    137
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    138
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                        return $ItemsByProductClass;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                             5                          | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                             5                          | 
                
                 | 
                     * 受注の仮確定処理を行います。  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    145
                 | 
                                    
                                                     | 
                
                 | 
                     * @param ItemHolderInterface $target  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                     * @param PurchaseContext $context  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    147
                 | 
                                    
                             5                          | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    148
                 | 
                                    
                                                     | 
                
                 | 
                     * @throws PurchaseException  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    149
                 | 
                                    
                             5                          | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    150
                 | 
                                    
                                                     | 
                
                 | 
                    public function prepare(ItemHolderInterface $target, PurchaseContext $context)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    151
                 | 
                                    
                             5                          | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    152
                 | 
                                    
                             5                          | 
                
                 | 
                        if (is_null($context->getOriginHolder())) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    153
                 | 
                                    
                                                     | 
                
                 | 
                            return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    154
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    155
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    156
                 | 
                                    
                             5                          | 
                
                 | 
                        $diff = $this->getDiffOfQuantities($context->getOriginHolder(), $target);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    157
                 | 
                                    
                             5                          | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    158
                 | 
                                    
                             5                          | 
                
                 | 
                        foreach ($diff as $id => $quantity) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    159
                 | 
                                    
                                                     | 
                
                 | 
                            /** @var ProductClass $ProductClass */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    160
                 | 
                                    
                                                     | 
                
                 | 
                            $ProductClass = $this->productClassRepository->find($id);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    161
                 | 
                                    
                                                     | 
                
                 | 
                            if ($ProductClass->isStockUnlimited()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    162
                 | 
                                    
                                                     | 
                
                 | 
                                continue;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    163
                 | 
                                    
                             5                          | 
                
                 | 
                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    164
                 | 
                                    
                             5                          | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    165
                 | 
                                    
                                                     | 
                
                 | 
                            $stock = $ProductClass->getStock() - $quantity;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    166
                 | 
                                    
                                                     | 
                
                 | 
                            $ProductStock = $ProductClass->getProductStock();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    167
                 | 
                                    
                                                     | 
                
                 | 
                            if (!$ProductStock) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    168
                 | 
                                    
                                                     | 
                
                 | 
                                $ProductStock = new ProductStock();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    169
                 | 
                                    
                                                     | 
                
                 | 
                                $ProductStock->setProductClass($ProductClass);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    170
                 | 
                                    
                                                     | 
                
                 | 
                                $ProductClass->setProductStock($ProductStock);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    171
                 | 
                                    
                                                     | 
                
                 | 
                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    172
                 | 
                                    
                                                     | 
                
                 | 
                            $ProductClass->setStock($stock);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    173
                 | 
                                    
                                                     | 
                
                 | 
                            $ProductStock->setStock($stock);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    174
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    175
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    176
                 | 
                                    
                             5                          | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    177
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    178
                 | 
                                    
                                                     | 
                
                 | 
                     * 受注の確定処理を行います。  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    179
                 | 
                                    
                             5                          | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    180
                 | 
                                    
                                                     | 
                
                 | 
                     * @param ItemHolderInterface $target  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    181
                 | 
                                    
                                                     | 
                
                 | 
                     * @param PurchaseContext $context  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    182
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    183
                 | 
                                    
                                                     | 
                
                 | 
                     * @throws PurchaseException  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    184
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    185
                 | 
                                    
                                                     | 
                
                 | 
                    public function commit(ItemHolderInterface $target, PurchaseContext $context)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    186
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    187
                 | 
                                    
                                                     | 
                
                 | 
                        // 何もしない.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    188
                 | 
                                    
                                                     | 
                
                 | 
                        return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    189
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    190
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    191
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    192
                 | 
                                    
                                                     | 
                
                 | 
                     * 仮確定した受注データの取り消し処理を行います。  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    193
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    194
                 | 
                                    
                                                     | 
                
                 | 
                     * @param ItemHolderInterface $itemHolder  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    195
                 | 
                                    
                                                     | 
                
                 | 
                     * @param PurchaseContext $context  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    196
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    197
                 | 
                                    
                                                     | 
                
                 | 
                    public function rollback(ItemHolderInterface $itemHolder, PurchaseContext $context)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    198
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    199
                 | 
                                    
                                                     | 
                
                 | 
                        // 何もしない.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    200
                 | 
                                    
                                                     | 
                
                 | 
                        return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    201
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    202
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    203
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
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: