Add.php

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<?php
namespace Magento\Backend\Model\Menu\Builder\Command;

class Add extends \Magento\Backend\Model\Menu\Builder\AbstractCommand
{
    protected $_requiredParams = ["id", "title", "module", "resource"];

    public function chain(\Magento\Backend\Model\Menu\Builder\AbstractCommand $command)
    {
        if ($command instanceof \Magento\Backend\Model\Menu\Builder\Command\Add) {
            throw new \InvalidArgumentException("Two 'add' commands cannot have equal id (" . $command->getId() . ")");
        }
        return parent::chain($command);
    }

    protected function _execute(array $itemParams)
    {
        foreach ($this->_data as $key => $value) {
            $itemParams[$key] = isset($itemParams[$key]) ? $itemParams[$key] : $value;
        }
        return $itemParams;
    }
}