<?php
/**
 * OpenMage
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available at https://opensource.org/license/osl-3-0-php
 *
 * @category   Mage
 * @package    Mage_Core
 * @copyright  Copyright (c) 2006-2020 Magento, Inc. (https://www.magento.com)
 * @copyright  Copyright (c) 2020-2023 The OpenMage Contributors (https://www.openmage.org)
 * @license    https://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Immediate flush block. To be used only as root
 *
 * @category   Mage
 * @package    Mage_Core
 */
class Mage_Core_Block_Flush extends Mage_Core_Block_Abstract
{
    /**
     * @return string
     */
    protected function _toHtml()
    {
        if (!$this->_beforeToHtml()) {
            return '';
        }

        ob_implicit_flush();

        foreach ($this->getSortedChildren() as $name) {
            $block = $this->getLayout()->getBlock($name);
            if (!$block) {
                Mage::exception(Mage::helper('core')->__('Invalid block: %s', $name));
            }
            echo $block->toHtml();
        }
        return '';
    }
}
