private static TSList <TradeData> DeserializeTrades(string[] lines)
{
if (lines == null)
{
return(null);
}
TSList <TradeData> tempTrades = new TSList <TradeData>();
int cnt = int.Parse(lines[0]);
for (int i = 0; i < cnt; i++)
{
string[] vars = new string[7];
for (int j = 0; j < 7; j++)
{
vars[j] = lines[i * 7 + 1 + j];
}
TradeData td = TradeData.Parse(vars);
tempTrades.Add(td);
}
return(tempTrades);
}
/// <summary>
/// Reading a stream by lines
/// trying to parse TradeData
/// <remarks>method allocated to decouple from filesteams and to provide testability on memorystreams</remarks>
/// </summary>
/// <param name="stream">Stream to read</param>
/// <returns>Single package of trade data that has been loaded</returns>
public override TradeDataPackage LoadTradeData(Stream stream)
{
var dataList = new List <TradeData>();
using (var sr = new StreamReader(stream))
{
string line;
sr.ReadLine(); // skip the first line with columns names
while ((line = sr.ReadLine()) != null)
{
try
{
var arr = line.Split(';'); // split by value separator symbol
var data = TradeData.Parse(arr); // parse values into TradeData object
dataList.Add(data);
}
catch
{
// suppress any exceptions when trying to read corrupted data from file
// disputable decision
// TODO: possibly revise exception suppressing later
}
}
}
return(new TradeDataPackage(dataList));
}
/// <summary>
/// Reading a stream by lines
/// trying to parse TradeData
/// <remarks>method allocated to decouple from filesteams and to provide testability on memorystreams</remarks>
/// </summary>
/// <param name="stream">Stream to read</param>
/// <returns>Single package of trade data that has been loaded</returns>
public override TradeDataPackage LoadTradeData(Stream stream)
{
var dataList = new List <TradeData>();
using (XmlReader reader = XmlReader.Create(stream))
{
try
{
while (reader.ReadToFollowing("value"))
{
var valuesArray = new string[6];
reader.MoveToFirstAttribute();
valuesArray[0] = reader.Value;
int i = 1;
while (reader.MoveToNextAttribute())
{
valuesArray[i++] = reader.Value;
}
var data = TradeData.Parse(valuesArray);
dataList.Add(data);
}
}
catch
{
// suppress any exceptions when trying to read corrupted data from file or different xml schema
// disputable decision
// TODO: possibly revise exception suppressing later
}
}
return(new TradeDataPackage(dataList));
}
public void Parse_NullValuesArray_ArgumentNullException()
{
// arrange
string[] nullValuesArray = null;
// act
var data = TradeData.Parse(nullValuesArray);
}
public void Parse_IncorrectVolumeValue_FormatException()
{
// arrange
const string csvStringWithIncorrectDateFormat = "2013-5-20,30.16,30.39,30.02,30.17,##123#";
var incorrectValues = csvStringWithIncorrectDateFormat.Split(',');
// act
var data = TradeData.Parse(incorrectValues);
}
public void Parse_AllValuesPlusExtras_NoException()
{
// arrange
const string csvString = "2013-5-20,30.16,30.39,30.02,30.17,1478200,some-extra-data1, some-extra-data2";
var valuesWithExtras = csvString.Split(',');
// act
var data = TradeData.Parse(valuesWithExtras);
}
public void Parse_NotAllValues_FormatException()
{
// arrange
const string csvStringWithNoVolume = "2013-5-20,30.16,30.39,30.02,30.17";
var valuesWithoutVolume = csvStringWithNoVolume.Split(',');
// act
var data = TradeData.Parse(valuesWithoutVolume);
}
public void Parse_IncorrectNullDateValue_FormatException()
{
// arrange
const string csvStringWithIncorrectDateFormat = "2013####,30.16,30.39,30.02,30.17,1478200";
var incorrectValues = csvStringWithIncorrectDateFormat.Split(',');
incorrectValues[0] = null;
// act
var data = TradeData.Parse(incorrectValues);
}
public void Parse_AllCorrectValues_NoException()
{
// arrange
var date = new DateTime(2013, 5, 20);
var open = new decimal(30.16);
var high = new decimal(30.39);
var low = new decimal(30.02);
var close = new decimal(30.17);
var volume = 1478200;
const string correctCsvString = "2013-5-20,30.16,30.39,30.02,30.17,1478200";
var corectValues = correctCsvString.Split(',');
// act
var data = TradeData.Parse(corectValues);
// assert
Assert.AreEqual(date, data.Date);
Assert.AreEqual(open, data.Open);
Assert.AreEqual(high, data.High);
Assert.AreEqual(low, data.Low);
Assert.AreEqual(close, data.Close);
Assert.AreEqual(volume, data.Volume);
}