AbstractCommand.php

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

abstract class AbstractCommand
{
    protected $_requiredParams = ["id"];

    protected $_data = [];

    protected $_next = null;

    public function __construct(array $data = [])
    {
        foreach ($this->_requiredParams as $param) {
            if (!isset($data[$param]) || $data[$param] === null) {
                throw new \InvalidArgumentException("Missing required param " . $param);
            }
        }
        $this->_data = $data;
    }

    public function getId()
    {
        return $this->_data['id'];
    }

    public function chain(\Magento\Backend\Model\Menu\Builder\AbstractCommand $command)
    {
        if ($this->_next === null) {
            $this->_next = $command;
        } else {
            $this->_next->chain($command);
        }
        return $this;
    }

    public function execute(array $itemParams = [])
    {
        $itemParams = $this->_execute($itemParams);
        if ($this->_next !== null) {
            $itemParams = $this->_next->execute($itemParams);
        }
        return $itemParams;
    }

    abstract protected function _execute(array $itemParams);
}