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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Reports\Report;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use DNADesign\Elemental\Models\BaseElement;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Core\ClassInfo;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Core\Injector\Injector;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\ORM\ArrayList;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\View\ArrayData;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use SilverStripe\Core\Convert;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class ElementUseReport extends Report  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $title = 'Content Blocks in Use';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $description = 'Show what Content Blocks are being used.';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getCount($params = array())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return BaseElement::get()->count();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function sourceRecords($params = [])  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (empty($params)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $classes = ClassInfo::subclassesFor(BaseElement::class);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $output = new ArrayList();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            foreach ($classes as $class) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                if ($class === BaseElement::class) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    continue;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                $inst = Injector::inst()->create($class);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                $output->push(new ArrayData([  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    'Icon' => $inst->getIcon(),  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    'Title' => $inst->getTypeNice(),  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    'ClassName' => $inst->sanitiseClassName($class),  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    'Total' => $class::get()->count()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                ]));  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return $output;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        } else if (isset($params['ClassName'])) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $convertClass = Injector::inst()->create(BaseElement::class)->unsanitiseClassName($params['ClassName']);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            if (ClassInfo::exists($convertClass)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                return $convertClass::get()->sort('Title', 'ASC'); | 
            
            
                                                                        
                            
            
                                    
            
            
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                            } else { | 
            
                            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function columns()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $params = $this->params;  | 
            
                            
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                        if (empty($params)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'Icon' => [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'title' => ''  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'Title' => [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'title' => _t(__CLASS__.'.Title', 'Content Type')  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'Total' => [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'title' => _t(__CLASS__.'.Total', 'Total'),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'link' => function($value, $item) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        return sprintf(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                            '<a class="grid-field__link" href="%s" title="%s">%s</a>',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                            Convert::raw2att($this->getLink('?filters[ClassName]='. $item->ClassName)), | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                            Convert::raw2att($value),  | 
            
                            
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                                            Convert::raw2xml($value)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'EditorPreview' => [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'title' => ''  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'PageTitle' => [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'title' => _t(__CLASS__.'.Page', 'Page'),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'link' => true  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.