//get buy and sell exchange rate by Bank ID
public async Task <Tuple <string, string> > GetBuySellRate(BankID bankID)
{
string buyRate = await GetBuyRate(bankID); //get buy rate
string sellRate = await GetSellRate(bankID); //get sell rate
return(new Tuple <string, string>(buyRate, sellRate));
}
private BankInfo CreateBankInfo(int ID, string name, string URI, string pattern, int buy, int sell)
{
var bankID = BankID.Create(ID);
var bankName = BankName.Create(name);
var bankURI = BankURI.Create(URI);
var bankPattern = BankPattern.Create(pattern);
var bankBuy = BankIndex.Create(buy);
var bankSell = BankIndex.Create(sell);
return(new BankInfo(bankID, bankName, bankURI, bankPattern, bankBuy, bankSell));
}
//get exchange rate
private async Task <string> GetRate(BankID bankID, Operations operation)
{
if (!banksInfo.ContainsKey(bankID)) //if Bank ID is not in collection throw exception
{
throw new KeyNotFoundException("Can't find Bank with this ID ({bankID})");
}
var URI = banksInfo[bankID].URI; //bank website
var pattern = banksInfo[bankID].Pattern; //exchange pattern
var neededIndex = operation == Operations.Sell ? banksInfo[bankID].Sell : banksInfo[bankID].Buy; //get needed index
return(await ParseHTMLPage(URI, pattern, neededIndex));
}
} //which Regex.Match corresponds to the sell rate
public BankInfo(BankID id, BankName name, BankURI uri,
BankPattern pattern, BankIndex buy, BankIndex sell)
{
CheckParameter(id, nameof(id));
CheckParameter(name, nameof(name));
CheckParameter(uri, nameof(uri));
CheckParameter(pattern, nameof(pattern));
CheckParameter(buy, nameof(buy));
CheckParameter(sell, nameof(sell));
this.ID = id;
this.Name = name;
this.URI = uri;
this.Pattern = pattern;
this.Buy = buy;
this.Sell = sell;
}
public void ChangeID(BankID bankID)
{
CheckParameter(bankID, nameof(bankID));
this.ID = bankID;
}
//get sell exchange rate by Bank ID
public async Task <string> GetSellRate(BankID bankID)
{
return(await GetRate(bankID, Operations.Sell));
}
//get buy exchange rate by Bank ID
public async Task <string> GetBuyRate(BankID bankID)
{
return(await GetRate(bankID, Operations.Buy));
}
//remove bank info by ID
public void RemoveBankInfo(BankID bankID)
{
banksInfo.Remove(bankID);
}