MixinFactory.php

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<?php
namespace Magento\Setup\Model\Description\Mixin;

class MixinFactory
{
    const SPAN_MIXIN = 'span';
    const BOLD_MIXIN = 'b';
    const BRAKE_MIXIN = 'br';
    const PARAGRAPH_MIXIN = 'p';
    const HEADER_MIXIN = 'h1';
    const ITALIC_MIXIN = 'i';
    private $typeClassMap = [
        self::SPAN_MIXIN => SpanMixin::class,
        self::BOLD_MIXIN => BoldMixin::class,
        self::BRAKE_MIXIN => BrakeMixin::class,
        self::PARAGRAPH_MIXIN => ParagraphMixin::class,
        self::HEADER_MIXIN => HeaderMixin::class,
        self::ITALIC_MIXIN => ItalicMixin::class,
    ];

    private $objectManager;

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager)
    {
        $this->objectManager = $objectManager;
    }

    public function create($mixinType)
    {
        if (!isset($this->typeClassMap[$mixinType])) {
            throw new \InvalidArgumentException(sprintf('Undefined mixin type: %s.', $mixinType));
        }

        $mixin = $this->objectManager->get($this->typeClassMap[$mixinType]);

        if (!$mixin instanceof \Magento\Setup\Model\Description\Mixin\DescriptionMixinInterface) {
            throw new \InvalidArgumentException(
                sprintf(
                    'Class "%s" must implement \Magento\Setup\Model\Description\Mixin\DescriptionMixinInterface.',
                    get_class($mixin)
                )
            );
        }

        return $mixin;
    }
}