Pager.php

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<?php
namespace Magento\Review\Helper\Action;

use Magento\Framework\Exception\LocalizedException;

class Pager extends \Magento\Framework\App\Helper\AbstractHelper
{
    const STORAGE_PREFIX = 'search_result_ids';

    protected $_storageId = null;

    protected $_items = null;

    protected $_backendSession;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Backend\Model\Session $backendSession
    ) {
        $this->_backendSession = $backendSession;
        parent::__construct($context);
    }

    public function setStorageId($storageId)
    {
        $this->_storageId = $storageId;
    }

    public function setItems(array $items)
    {
        $this->_items = $items;
        $this->_backendSession->setData($this->_getStorageKey(), $this->_items);

        return $this;
    }

    protected function _loadItems()
    {
        if ($this->_items === null) {
            $this->_items = (array)$this->_backendSession->getData($this->_getStorageKey());
        }
    }

    public function getNextItemId($id)
    {
        $position = $this->_findItemPositionByValue($id);
        if ($position === false || $position == count($this->_items) - 1) {
            return false;
        }

        return $this->_items[$position + 1];
    }

    public function getPreviousItemId($id)
    {
        $position = $this->_findItemPositionByValue($id);
        if ($position === false || $position == 0) {
            return false;
        }

        return $this->_items[$position - 1];
    }

    protected function _findItemPositionByValue($value)
    {
        $this->_loadItems();
        return array_search($value, $this->_items);
    }

    protected function _getStorageKey()
    {
        if (!$this->_storageId) {
            throw new LocalizedException(__("The storage key wasn't set. Add the storage key and try again."));
        }

        return self::STORAGE_PREFIX . $this->_storageId;
    }
}