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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace BestServedCold\LaravelZendSearch\Lucene\Store;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use BestServedCold\LaravelZendSearch\Lucene\Index;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use BestServedCold\LaravelZendSearch\Lucene\Search;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use ZendSearch\Lucene\Document;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use ZendSearch\Lucene\Document\Field;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class Insert  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package BestServedCold\LaravelZendSearch\Lucene\Store  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                final class Insert  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var Index  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $index;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var Document  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $document;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Insert constructor.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param Search   $search  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param Index    $index  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param Document $document  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(Search $search, Index $index, Document $document)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->search   = $search;  | 
            
                            
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                        $this->index    = $index;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->document = $document;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**               | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Insert  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  $id  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  array          $fields     fields that are indexed  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  boolean|string $uid        unique identifier, if required  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return mixed  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function insert($id, array $fields, $uid = false)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->document->addField($this->field('xref_id', $id)); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->document = $this->addUid($this->document, $uid);  | 
            
                            
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                        $this->document = $this->addFields($this->document, $fields);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->index->get()->addDocument($this->document);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  string $keyword  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  string $value  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  string $type  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Field  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    private function field($keyword, $value, $type = 'keyword')  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return Field::$type($keyword, $value);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param  Document $document  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @param  bool     $uid  | 
            
            
                                                                        
                            
            
                                    
            
            
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                     * @return Document  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function addUid(Document $document, $uid = false)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($uid) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $document->addField($this->field('uid', strtoupper($uid))); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $document;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  Document $document  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  array    $fields  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Document  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function addFields(Document $document, array $fields)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($fields as $key => $field) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $document->addField($this->field($key, strtoupper($field)));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $document;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: