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1<?php
2
3namespace MediaWiki\IPInfo\InfoRetriever;
4
5use Exception;
6use GeoIp2\Database\Reader;
7
8class ReaderFactory {
9
10    /** @var Reader[] Map of filename to the Reader object */
11    private $readers = [];
12
13    /**
14     * @param string $path
15     * @param string $filename
16     * @return Reader|null null if the file path or file is invalid
17     */
18    public function get( string $path, string $filename ): ?Reader {
19        if ( isset( $this->readers[$filename] ) ) {
20            return $this->readers[$filename];
21        }
22        try {
23            $reader = $this->getReader( $path . $filename );
24        } catch ( Exception $e ) {
25            return null;
26        }
27
28        $this->readers[$filename] = $reader;
29
30        return $this->readers[$filename];
31    }
32
33    /**
34     * @param string $filename
35     * @return Reader
36     * @throws Exception
37     */
38    protected function getReader( string $filename ): Reader {
39        return new Reader( $filename );
40    }
41}