PatternGenerator.php

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<?php
namespace Magento\Signifyd\Model\MessageGenerators;

class PatternGenerator implements GeneratorInterface
{
    private $template;

    private $requiredParams;

    public function __construct($template, array $requiredParams = [])
    {
        $this->template = $template;
        $this->requiredParams = $requiredParams;
    }

    public function generate(array $data)
    {
        $placeholders = [];
        foreach ($this->requiredParams as $param) {
            if (empty($data[$param])) {
                throw new GeneratorException(__('The "%1" should not be empty.', $param));
            }
            $placeholders[] = $data[$param];
        }
        return __($this->template, ...$placeholders);
    }
}