FailTransactionStatusDelegate.js

class FailTransactionStatusDelegate {
  constructor(transaction) {
    this.statusString = '失敗';
    this.isNonRefundable = true;
  }
}

export default FailTransactionStatusDelegate;

PendingTransactionStatusDelegate.js

class PendingTransactionStatusDelegate {
  constructor(transaction) {
    this.statusString = '處理中';
    this.isNonRefundable = true;
  }
}

export default PendingTransactionStatusDelegate;

SuccessTransactioStatusnDelegate.js

class SuccessTransactioStatusnDelegate {
  constructor(transaction) {
    this.statusString = '成功';
    this.isNonRefundable = false;
  }
}

export default SuccessTransactioStatusnDelegate;

Transaction.js

import SuccessTransactioStatusnDelegate from './SuccessTransactioStatusnDelegate';
import FailTransactionStatusDelegate from './FailTransactionStatusDelegate';
import PendingTransactionStatusDelegate from './PendingTransactionStatusDelegate';

class Transaction {
  constructor(transaction) {
    this.id = transaction.id;
    this.transactionStatusDelegate = this.getTransactionStatusDelegate(transaction);
  }
  
  //...
  
  getTransactionStatusDelegate(transaction) {
    switch (transaction.status) {
      case 'SUCCESS':
        return new SuccessTransactioStatusnDelegate(transaction);
      case 'FAIL':
        return new FailTransactionStatusDelegate(transaction);
      case 'PENDING':
        return new PendingTransactionStatusDelegate(transaction);
      default:
        throw new Error(`Have no transaction status: ${transaction.status}`);
    }
  }
}

export default Transaction;