AbstractContainer.php

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<?php
namespace Magento\Payment\Block\Info;

abstract class AbstractContainer extends \Magento\Framework\View\Element\Template
{
    protected $_paymentData = null;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Payment\Helper\Data $paymentData,
        array $data = []
    ) {
        $this->_paymentData = $paymentData;
        parent::__construct($context, $data);
    }

    protected function _prepareLayout()
    {
        if ($info = $this->getPaymentInfo()) {
            $this->setChild($this->_getInfoBlockName(), $this->_paymentData->getInfoBlock($info, $this->getLayout()));
        }
        return parent::_prepareLayout();
    }

    protected function _getInfoBlockName()
    {
        if ($info = $this->getPaymentInfo()) {
            return 'payment.info.' . $info->getMethodInstance()->getCode();
        }
        return false;
    }

    abstract public function getPaymentInfo();

    public function setInfoTemplate($method = '', $template = '')
    {
        if ($info = $this->getPaymentInfo()) {
            if ($info->getMethodInstance()->getCode() == $method) {
                $this->getChildBlock($this->_getInfoBlockName())->setTemplate($template);
            }
        }
        return $this;
    }
}