CloudControl\Cms\search\indexer\InverseDocumentFrequency

Complexity

Total Complexity

4

Size/Duplication

Total Lines	47
Duplicated Lines	0 %

Importance

Changes

0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	4	1
A	execute()	0	22	3

<?php
/**
 * User: jensk
 * Date: 1-3-2017
 * Time: 11:41
 */

namespace CloudControl\Cms\search\indexer;


class InverseDocumentFrequency
{
    /**
     * @var \PDO
     */
    protected $dbHandle;
    protected $documentCount;

    /**
     * InverseDocumentFrequency constructor.
     *
     * @param \PDO $dbHandle
     * @param int $documentCount
     */
    public function __construct($dbHandle, $documentCount)
    {
        $this->dbHandle = $dbHandle;
        $this->documentCount = $documentCount;
    }

    /**
     * Formula to calculate:
     *        idf(t) = 1 + log ( totalDocuments / (documentsThatContainTheTerm + 1))
     * @throws \Exception
     */
    public function execute()
    {
        $db = $this->dbHandle;
        $db->/** @scrutinizer ignore-call */sqliteCreateFunction('log', 'log', 1);
        $sql = '
		INSERT INTO inverse_document_frequency (term, inverseDocumentFrequency)
		SELECT DISTINCT term, (1+(log(:documentCount / COUNT(documentPath) + 1))) as inverseDocumentFrequency
					  FROM term_count
				  GROUP BY term
		';

        if (!$stmt = $db->prepare($sql)) {
            $errorInfo = $db->errorInfo();
            $errorMsg = $errorInfo[2];
            throw new \Exception('SQLite Exception: ' . $errorMsg . ' in SQL: <br /><pre>' . $sql . '</pre>');
        }
        $stmt->bindValue(':documentCount', $this->documentCount);
        $result = $stmt->execute();
        if ($result === false) {
            $errorInfo = $db->errorInfo();
            $errorMsg = $errorInfo[2];
            throw new \Exception('SQLite Exception: ' . $errorMsg . ' in SQL: <br /><pre>' . $sql . '</pre>');
        }
    }
}