ThemePackageList.php

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

use Magento\Framework\Component\ComponentRegistrar;
use Magento\Framework\Component\ComponentRegistrarInterface;

class ThemePackageList
{
    private $componentRegistrar;

    private $factory;

    public function __construct(ComponentRegistrarInterface $componentRegistrar, ThemePackageFactory $factory)
    {
        $this->componentRegistrar = $componentRegistrar;
        $this->factory = $factory;
    }

    public function getTheme($key)
    {
        $themePath = $this->componentRegistrar->getPath(ComponentRegistrar::THEME, $key);
        if (empty($themePath)) {
            throw new \UnexpectedValueException("No theme registered with name '$key'");
        }
        return $this->factory->create($key, $themePath);
    }

    public function getThemes()
    {
        $themes = [];
        foreach ($this->componentRegistrar->getPaths(ComponentRegistrar::THEME) as $key => $path) {
            $themes[$key] = $this->factory->create($key, $path);
        }
        return $themes;
    }
}