public static ChannelSearchResult FindByNameAndVariable(string name, Variable v)
{
ChannelSearchResult result;
//TODO: try to use delegates in future version to eliminate duplicate code
ChannelList channels = ChannelManager.GetListByStationNameAndVariable(name, v.Id);
if (channels != null)
{
result = new ChannelSearchResult(channels);
return result;
}
MessageWriter writer = new MessageWriter();
writer.VariableName = v.Name;
StationList stations = StationManager.GetListByName(name);
if (stations != null)
{
result = new ChannelSearchResult(stations);
writer.StationName = stations[0].Name;
result.ErrorMessage = writer.WriteErrorMessage(MessageType.NoStationVariable);
return result;
}
result = new ChannelSearchResult();
result.ErrorMessage = writer.WriteErrorMessage(MessageType.NoStation);
return result;
}
public static ChannelSearchResult FindByStationIdAndVariable(int stId, Variable v)
{
ChannelSearchResult result;
bool foundChannel = false;
//bool foundStation = false;
ChannelList channels = ChannelManager.GetListByStationAndVariable(stId, v.Id);
if (channels.Count > 0)
{
result = new ChannelSearchResult(channels);
foundChannel = true;
return result;
}
//if the requested variable is daily precipitation - try to find
//hourly precipitation instead
if (foundChannel == false && v.VarEnum == VariableEnum.Precip)
{
//"1" means "hourly precipitation"
channels = ChannelManager.GetListByStationAndVariable(stId, 1);
if (channels.Count > 0)
{
foundChannel = true;
foreach (Channel ch in channels)
{
ch.Variable = VariableManager.GetItemByEnum(VariableEnum.Precip);
}
result = new ChannelSearchResult(channels);
return result;
}
}
//channel not found --> search if a a station exists
MessageWriter writer = new MessageWriter();
writer.VariableName = v.Name;
Station station = StationManager.GetItemById(stId, false);
if (station != null)
{
result = new ChannelSearchResult();
result.Stations.Add(station);
writer.StationName = station.Name;
result.ErrorMessage = writer.WriteErrorMessage(MessageType.NoStationVariable);
return result;
}
result = new ChannelSearchResult();
result.ErrorMessage = writer.WriteErrorMessage(MessageType.NoStation);
return result;
}
public QueryStringValidator(string QueryString)
{
_qstr = QueryString;
_writer = new MessageWriter();
}
public PageUrlValidator(NameValueCollection queryString)
{
_queryString = queryString;
_isValid = false;
_writer = new MessageWriter();
}
/// <summary>
/// Generates a new 'chart' image to be written to http output stream.
/// Also saves the newly generated image to file on disk.
/// </summary>
/// <param name="ImagePath">Http request path of the chart image</param>
public Bitmap GenerateImage(string ImagePath)
{
Bitmap bmp;
ChartEngine ChartGen = new ChartEngine();
Width = 600;
Height = 275;
ShowText = true;
QueryStringValidator QVal = new QueryStringValidator(ImagePath);
QVal.Validate(); //the language and culture is also set in the validator
if (QVal.IsValid)
{
// get query string parameters
string lang = QVal.Culture;
int StId = QVal.StationId;
Variable curVar = QVal.Variable;
DateTime startTime = QVal.StartDate;
DateTime endTime = QVal.EndDate;
// TODO: for longer intervals change curVar to [precip_day]
// search for the channel corresponding to station/variable combination
ChannelSearchResult found = ChannelSearchEngine.FindByStationIdAndVariable(
StId, curVar);
if (!found.HasMatchingStations) //no matching station
{
return ChartGen.CreateErrorChart(found.ErrorMessage);
}
if (found.HasMatchingChannels) //correct results found
{
Channel ch = found.Channels[0];
ITimeSeries ts;
TimeInterval interval = new TimeInterval(startTime, endTime);
MessageWriter writer = new MessageWriter(ch.Station.Name, ch.Variable.Name);
// for precipitation, if it's hourly and a longer period,
// always select daily precipitation to display a readable graph
// otherwise, hourly precipitation will be displayed.
int maxHourPrecipPeriod = 10;
VariableEnum var = ch.Variable.VarEnum;
if (var == VariableEnum.PrecipHour && interval.Length.TotalDays > maxHourPrecipPeriod)
{
var = VariableEnum.Precip;
}
//here we retrieve the time series
ts = TimeSeriesManager.GetTimeSeries(ch, interval);
if (ts.Count == 0) //this also means 'no data for time series'
{
bmp = ChartGen.CreateErrorChart
(writer.WriteErrorMessage(MessageType.NoDataForPeriod));
}
bmp = ChartGen.CreateChart(ch, ts);
}
else
{
// incorrect input - create a 'chart' with an error message
bmp = ChartGen.CreateErrorChart(found.ErrorMessage);
}
}
else
{
// incorrect input - create a 'chart' with an error message
bmp = ChartGen.CreateErrorChart(QVal.ErrorMessage);
}
return bmp;
}
