MaxNestingPathGenerator.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\ResourceStorage\StorageHandler\PathGenerator;
 
use ILIAS\ResourceStorage\Identification\ResourceIdentification;
 
class MaxNestingPathGenerator implements PathGenerator
{
    private const MAX_NESTING_256 = 256;
    private const MAX_NESTING_4096 = 4096;
    private const MAX_NESTING_65536 = 65536;
 
    protected int $max_nesting = self::MAX_NESTING_4096;
    protected int $splitter = 3;
    protected int $limited_layers = 3;
 
    public function __construct()
    {
        $this->splitter = match ($this->max_nesting) {
            self::MAX_NESTING_4096 => 3,
            self::MAX_NESTING_65536 => 4,
            default => 2,
        };
    }
 
    public function getPathFor(ResourceIdentification $i): string
    {
        $splitted = str_split(str_replace("-", "", $i->serialize()), $this->splitter);
 
        $first_part = array_slice($splitted, 0, $this->limited_layers + 1);
        $second_part = array_slice($splitted, $this->limited_layers + 1);
 
        return implode("/", $first_part) . implode("", $second_part);
    }
 
    public function getIdentificationFor(string $path): ResourceIdentification
    {
        $str = str_replace("/", "", $path);
 
        $p1 = substr($str, 0, 8);
        $p2 = substr($str, 8, 4);
        $p3 = substr($str, 12, 4);
        $p4 = substr($str, 16, 4);
        $p5 = substr($str, 20, 12);
 
        return new ResourceIdentification("$p1-$p2-$p3-$p4-$p5");
    }
}