Composite.php

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<?php
namespace Magento\CatalogInventory\Block\Stockqty;

use Magento\Catalog\Model\Product;

abstract class Composite extends DefaultStockqty
{
    private $_childProducts;

    abstract protected function _getChildProducts();

    public function getChildProducts()
    {
        if ($this->_childProducts === null) {
            $this->_childProducts = $this->_getChildProducts();
        }
        return $this->_childProducts;
    }

    public function getDetailsPlaceholderId()
    {
        return $this->getPlaceholderId() . '-details';
    }
}