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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace ApacheSolrForTypo3\Solr\ViewHelpers\Widget\Controller;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This file is part of the TYPO3 CMS project.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * It is free software; you can redistribute it and/or modify it under  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * the terms of the GNU General Public License, either version 2  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * of the License, or any later version.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * For the full copyright and license information, please read the  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * LICENSE.txt file that was distributed with this source code.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * The TYPO3 project - inspiring people to share!  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use ApacheSolrForTypo3\Solr\Domain\Search\ResultSet\Grouping\GroupItem;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use ApacheSolrForTypo3\Solr\Domain\Search\ResultSet\SearchResultSet;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class ResultPaginateController  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Frans Saris <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Timo Hund <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package ApacheSolrForTypo3\Solr\ViewHelpers\Widget\Controller  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class GroupItemPaginateController extends AbstractPaginateWidgetController  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var SearchResultSet  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $resultSet;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var GroupItem  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $groupItem;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function initializeAction()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::initializeAction();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->resultSet = $this->widgetConfiguration['resultSet'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->groupItem = $this->widgetConfiguration['groupItem'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->configuration['itemsPerPage'] = $this->getItemsPerPage();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->numberOfPages = (int)ceil($this->groupItem->getNumFound() / $this->configuration['itemsPerPage']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Determines the number of results per page. When nothing is configured 10 will be returned.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return int  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function getItemsPerPage()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $perPage = (int)$this->groupItem->getGroup()->getResultsPerPage();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $perPage > 0 ? $perPage : 10;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \ApacheSolrForTypo3\Solr\Mvc\Controller\SolrControllerContext $controllerContext  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \ApacheSolrForTypo3\Solr\Mvc\Controller\SolrControllerContext  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function setActiveSearchResultSet($controllerContext) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $controllerContext->setSearchResultSet($this->resultSet);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $controllerContext;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function indexAction()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // set current page  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $groupName = $this->groupItem->getGroup()->getGroupName();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $groupItemValue = $this->groupItem->getGroupValue();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->currentPage = $this->resultSet->getUsedSearchRequest()->getGroupItemPage($groupName, $groupItemValue);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->currentPage < 1) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->currentPage = 1;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->view->assign('contentArguments', [$this->widgetConfiguration['as'] => $this->groupItem->getSearchResults(), 'pagination' => $this->buildPagination()]); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->view->assign('configuration', $this->configuration); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->view->assign('resultSet', $this->resultSet); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->view->assign('groupItem', $this->groupItem); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!empty($this->templatePath)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->view->setTemplatePathAndFilename($this->templatePath);  | 
            
                            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: