ThemeProvider.php

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<?php
namespace Magento\Framework\View\Design\Theme;

use Magento\Framework\View\Design\ThemeFactory;
use Magento\Framework\View\Design\ThemeInterface;

class ThemeProvider implements \Magento\Framework\View\Design\Theme\ThemeProviderInterface
{
    private $themeList;

    protected $themeFactory;

    private $themes;

    public function __construct(
        ListInterface $themeList,
        ThemeFactory $themeFactory
    ) {
        $this->themeList = $themeList;
        $this->themeFactory = $themeFactory;
    }

    public function getThemeByFullPath($fullPath)
    {
        if (!isset($this->themes[$fullPath])) {
            $this->themes[$fullPath] = $this->themeList->getThemeByFullPath($fullPath);
        }
        return $this->themes[$fullPath];
    }

    public function getThemeCustomizations(
        $area = \Magento\Framework\App\Area::AREA_FRONTEND,
        $type = \Magento\Framework\View\Design\ThemeInterface::TYPE_VIRTUAL
    ) {
        return [];
    }

    public function getThemeById($themeId)
    {
        return $this->themeFactory->getTheme($themeId);
    }
}