Config.php

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<?php
namespace Magento\Theme\Model\Layout;

class Config
{
    protected $_pageLayouts;

    protected $_dataStorage;

    public function __construct(\Magento\Framework\Config\DataInterface $dataStorage)
    {
        $this->_dataStorage = $dataStorage;
    }

    protected function _initPageLayouts()
    {
        if ($this->_pageLayouts === null) {
            $this->_pageLayouts = [];
            foreach ($this->_dataStorage->get(null) as $layoutCode => $layoutConfig) {
                $layoutConfig['label'] = __($layoutConfig['label']);
                $this->_pageLayouts[$layoutCode] = new \Magento\Framework\DataObject($layoutConfig);
            }
        }
        return $this;
    }

    public function getPageLayouts()
    {
        $this->_initPageLayouts();
        return $this->_pageLayouts;
    }

    public function getPageLayout($layoutCode)
    {
        $this->_initPageLayouts();

        if (isset($this->_pageLayouts[$layoutCode])) {
            return $this->_pageLayouts[$layoutCode];
        }

        return false;
    }

    public function getPageLayoutHandles()
    {
        $handles = [];

        foreach ($this->getPageLayouts() as $layout) {
            $handles[$layout->getCode()] = $layout->getCode();
        }

        return $handles;
    }
}