/// <summary>
/// Prints the successful result
/// </summary>
/// <param name="statusCode">Status code</param>
/// <param name="queryStringData">Query string data</param>
/// <param name="constantValue">Constant value</param>
private void PrintSuccessfulResult(int statusCode, QueryStringData queryStringData, string constantValue)
{
PrintResultImpl(statusCode, () =>
{
Console.WriteLine(string.Format("\tfileName: => {0}, id => {1}, value => {2}", queryStringData.FileName, queryStringData.ConstantID, constantValue));
});
}
/// <summary>
/// CallBack method for handling request
/// </summary>
/// <param name="o">object to be casted to HttpListenerContext</param>
private void ProcessRequest(object obj)
{
Console.WriteLine("Processing the request...");
HttpListenerContext context = obj as HttpListenerContext;
//try
//{
using (StreamWriter writer = new StreamWriter(context.Response.OutputStream))
{
List <string> errors = GetQueryStringValidationErrors(context.Request.QueryString).ToList();
//There is no any error in validation
if (!errors.Any())
{
QueryStringData queryStringData = GetQueryStringData(context);
string value = GetConstantValueByID(queryStringData);
//Constant is found, everything is ok
if (value != null)
{
context.Response.StatusCode = (int)HttpStatusCode.OK;
writer.Write(value);
}
//Constant is not found
else
{
context.Response.StatusCode = (int)HttpStatusCode.NotFound;
writer.Write(string.Format("constant {0} you have requested is not found", queryStringData.ConstantID));
}
PrintSuccessfulResult(context.Response.StatusCode, queryStringData, value);
}
//There is an error in validation
else
{
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
errors.ForEach(writer.WriteLine);
PrintErrorResult(context.Response.StatusCode, errors);
}
}
//}
//catch (Exception e)
//{
// Console.WriteLine("There is an exception thrown - {0}", e.Message);
//}
}
/// <summary>
/// Returns constant value by its id
/// </summary>
/// <param name="queryStringData">QueryStringData</param>
/// <returns>constant value</returns>
private string GetConstantValueByID(QueryStringData queryStringData)
{
const string regexPattern = @"(^\d+),\s+(.+)";
foreach (string item in File.ReadLines(queryStringData.FileName))
{
Match match = Regex.Match(item, regexPattern);
if (match.Success)
{
int currentConstantID = int.Parse(match.Groups[1].Value);
if (currentConstantID == queryStringData.ConstantID)
{
return(match.Groups[2].Value);
}
}
}
return(null);
}
