AbstractComposite.php

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<?php
namespace Magento\Config\Model\Config\Structure\Element;

abstract class AbstractComposite extends \Magento\Config\Model\Config\Structure\AbstractElement
{
    protected $_childrenIterator;

    public function __construct(
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\Module\Manager $moduleManager,
        Iterator $childrenIterator
    ) {
        parent::__construct($storeManager, $moduleManager);
        $this->_childrenIterator = $childrenIterator;
    }

    public function setData(array $data, $scope)
    {
        parent::setData($data, $scope);
        $children = array_key_exists(
            'children',
            $this->_data
        ) && is_array(
            $this->_data['children']
        ) ? $this->_data['children'] : [];
        $this->_childrenIterator->setElements($children, $scope);
    }

    public function hasChildren()
    {
        foreach ($this->getChildren() as $child) {
            return (bool)$child;
        }
        return false;
    }

    public function getChildren()
    {
        return $this->_childrenIterator;
    }

    public function isVisible()
    {
        if (parent::isVisible()) {
            return $this->hasChildren() || $this->getFrontendModel();
        }
        return false;
    }
}