Toolbar.php

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<?php
namespace Magento\Catalog\Model\Product\ProductList;

class Toolbar
{
    const PAGE_PARM_NAME = 'p';

    const ORDER_PARAM_NAME = 'product_list_order';

    const DIRECTION_PARAM_NAME = 'product_list_dir';

    const MODE_PARAM_NAME = 'product_list_mode';

    const LIMIT_PARAM_NAME = 'product_list_limit';

    protected $request;

    public function __construct(
        \Magento\Framework\App\Request\Http $request
    ) {
        $this->request = $request;
    }

    public function getOrder()
    {
        return $this->request->getParam(self::ORDER_PARAM_NAME);
    }

    public function getDirection()
    {
        return $this->request->getParam(self::DIRECTION_PARAM_NAME);
    }

    public function getMode()
    {
        return $this->request->getParam(self::MODE_PARAM_NAME);
    }

    public function getLimit()
    {
        return $this->request->getParam(self::LIMIT_PARAM_NAME);
    }

    public function getCurrentPage()
    {
        $page = (int) $this->request->getParam(self::PAGE_PARM_NAME);
        return $page ?: 1;
    }
}