AbstractAgreement.php

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<?php
namespace Magento\Paypal\Model\Billing;

abstract class AbstractAgreement extends \Magento\Framework\Model\AbstractModel
{
    protected $_paymentMethodInstance = null;

    protected $_errors = [];

    abstract public function initToken();

    abstract public function verifyToken();

    abstract public function place();

    abstract public function cancel();

    protected $_paymentData = null;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Payment\Helper\Data $paymentData,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->_paymentData = $paymentData;
        parent::__construct($context, $registry, $resource, $resourceCollection, $data);
    }

    public function getPaymentMethodInstance()
    {
        if ($this->_paymentMethodInstance === null) {
            $this->_paymentMethodInstance = $this->_paymentData->getMethodInstance($this->getMethodCode());
            $this->_paymentMethodInstance->setStore($this->getStoreId());
        }
        return $this->_paymentMethodInstance;
    }

    public function isValid()
    {
        $this->_errors = [];
        if ($this->getPaymentMethodInstance() === null || !$this->getPaymentMethodInstance()->getCode()) {
            $this->_errors[] = __('The payment method code is not set.');
        }
        if (!$this->getReferenceId()) {
            $this->_errors[] = __('The reference ID is not set.');
        }
        return empty($this->_errors);
    }

    public function beforeSave()
    {
        if ($this->isValid()) {
            return parent::beforeSave();
        }
        array_unshift($this->_errors, __('Unable to save Billing Agreement:'));
        throw new \Magento\Framework\Exception\LocalizedException(__(implode(' ', $this->_errors)));
    }
}