PathValidator.php

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<?php
namespace Magento\Config\Model\Config;

use Magento\Framework\Exception\ValidatorException;

class PathValidator
{
    private $structure;

    public function __construct(Structure $structure)
    {
        $this->structure = $structure;
    }

    public function validate($path)
    {
        $allPaths = $this->structure->getFieldPaths();

        if (!array_key_exists($path, $allPaths)) {
            throw new ValidatorException(__('The "%1" path doesn\'t exist. Verify and try again.', $path));
        }

        return true;
    }
}