Item.php

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<?php
namespace Magento\Reports\Model;

class Item extends \Magento\Framework\DataObject
{
    protected $_isEmpty = false;

    protected $_children = [];

    public function setIsEmpty($flag = true)
    {
        $this->_isEmpty = $flag;
        return $this;
    }

    public function getIsEmpty()
    {
        return $this->_isEmpty;
    }

    public function hasIsEmpty()
    {
    }

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

    public function setChildren($children)
    {
        $this->_children = $children;
        return $this;
    }

    public function hasChildren()
    {
        return count($this->_children) > 0 ? true : false;
    }

    public function addChild($child)
    {
        $this->_children[] = $child;
        return $this;
    }
}