private PlaceCollection GetPlaceCollection(T each)
{
PlaceCollection places = null;
if (string.IsNullOrEmpty(PlaceNamespace))
{
places = each.Places;
}
else
{
places = each.Places.NS(PlaceNamespace);
}
return(places);
}
public RatingScope <T> GetTopPercentage(string scoreName, int top)
{
RatingScope <T> result = new RatingScope <T>(Name);
RatingScope <T> radixStuds = new RatingScope <T>(Name);
decimal filterPercentage = top;
//把有那項排名的學生獨立出來。
foreach (T each in _students.Values)
{
PlaceCollection places = GetPlaceCollection(each);
if (places.Contains(scoreName))
{
radixStuds.Add(each);
}
}
//計算要取的 Percentage。
decimal extractPlace = Math.Ceiling((filterPercentage / 100m) * radixStuds.Count);
foreach (T each in radixStuds)
{
PlaceCollection places = GetPlaceCollection(each);
if (places[scoreName].Level <= extractPlace)
{
result.Add(each);
}
}
//之前的取百分比名次做法。
//foreach (RatingStudent each in students)
//{
// if (each.Places.Contains(ratingName))
// {
// Place p = each.Places[ratingName];
// decimal percentage = (100m * ((decimal)p.Level / (decimal)p.Radix));
// if (percentage <= 0) percentage = 1;
// if (percentage <= filterPercentage)
// {
// result.Add(each);
// }
// }
//}
return(result);
}
/// <summary>
/// 取得前 n 名次的學生。
/// </summary>
/// <param name="ratingName">排名的名稱，例如：國文。(與IScoreParser 實作之實體 Name 屬性值相同)</param>
/// <param name="top">要取得名次。</param>
/// <param name="placeNamespace">名次存放的 Namespace。</param>
public RatingScope <T> GetTopPlaces(string ratingName, int top)
{
RatingScope <T> result = new RatingScope <T>(Name);
foreach (T each in _students.Values)
{
PlaceCollection places = GetPlaceCollection(each);
if (places.Contains(ratingName))
{
if (places[ratingName].Level <= top)
{
result.Add(each);
}
}
}
return(result);
}
public RatingScope <T> GetLastPercentage(string scoreName, int last)
{
RatingScope <T> result = new RatingScope <T>(Name);
//RatingScope<T> radixStuds = new RatingScope<T>(Name);
decimal filterPercentage = last;
List <T> students = new List <T>();
//把有那項排名的學生獨立出來。
foreach (T each in _students.Values)
{
PlaceCollection places = GetPlaceCollection(each);
if (places.Contains(scoreName))
{
students.Add(each);
}
}
//計算要取的 Percentage。
decimal extractPlace = Math.Ceiling((filterPercentage / 100m) * students.Count);
students.Sort((x, y) =>
{
PlaceCollection placesX = GetPlaceCollection(x);
PlaceCollection placesY = GetPlaceCollection(y);
return(placesY[scoreName].Level.CompareTo(placesX[scoreName].Level));
});
if (students.Count <= 0)
{
return(result);
}
//取得最後一名的名次百分比。
decimal lastLevel = students[0].Places[scoreName].Level - extractPlace;
foreach (T student in students.Where(x => x.Places[scoreName].Level > lastLevel))
{
result.Add(student);
}
return(result);
}
/// <summary>
/// 取得後 n 名次的學生。
/// </summary>
/// <param name="ratingName">排名的名稱，例如：國文。(與IScoreParser 實作之實體 Name 屬性值相同)</param>
/// <param name="last">要取得名次。</param>
public RatingScope <T> GetLastPlaces(string scoreName, int last)
{
RatingScope <T> result = new RatingScope <T>(Name);
List <T> students = new List <T>();
foreach (T each in _students.Values)
{
PlaceCollection places = GetPlaceCollection(each);
if (places.Contains(scoreName))
{
students.Add(each);
}
}
students.Sort((x, y) =>
{
PlaceCollection placesX = GetPlaceCollection(x);
PlaceCollection placesY = GetPlaceCollection(y);
return(placesY[scoreName].Level.CompareTo(placesX[scoreName].Level));
});
if (students.Count <= 0)
{
return(result);
}
//取得最後一名的名次。
int lastLevel = students[0].Places[scoreName].Level - last;
foreach (T student in students.Where(x => x.Places[scoreName].Level > lastLevel))
{
result.Add(student);
}
return(result);
}
/// <summary>
/// 進行排名。
/// </summary>
/// <param name="scoreParser">要被排名的成績計算邏輯。</param>
/// <param name="option">排名選項，接序 or 不接序排名。</param>
/// <param name="provider">當相同名次時決定先後成績資料，所有排名範圍內的學生都應該供相同順序與數量的成績資料，否則會產生無法預期的結果。</param>
public void Rank(IScoreParser <T> scoreParser, PlaceOptions option)
{
//取得有成績的學生。
List <ScoredStudent> students = GetScoredStudents(scoreParser);
//沒有成績就不用排名了。
if (students.Count <= 0)
{
return;
}
//排序名次。
students.Sort(delegate(ScoredStudent x, ScoredStudent y)
{
if (scoreParser is IScoresParser <T> )
{
IScoresParser <T> p2 = scoreParser as IScoresParser <T>;
if (x.SecondScores.Count <= 0)
{
x.SecondScores = p2.GetSecondScores(x.Source);
}
if (y.SecondScores.Count <= 0)
{
y.SecondScores = p2.GetSecondScores(y.Source);
}
}
return(y.CompareTo(x));
});
int radix = students.Count; //基數。
string scorename = scoreParser.Name; //排名的名稱。
//先把之前的排名結果清掉。
foreach (T each in this)
{
PlaceCollection places = GetPlaceCollection(each);
if (places.Contains(scorename))
{
places.Remove(scorename);
}
}
//決定排序。
IPlaceAlgorithm placeAlg = null;
if (option == PlaceOptions.Sequence)
{
placeAlg = new Sequence();
}
else
{
placeAlg = new Unsequence();
}
StandardPercentage percenAlg = new StandardPercentage();
percenAlg.Initital(students.Count);
foreach (ScoredStudent each in students)
{
int level = placeAlg.NextLevel(each);
int percen = percenAlg.NextPercentage(level);
T student = _students[each.Id];
PlaceCollection places = GetPlaceCollection(student);
if (places.Contains(scorename))
{
places[scorename] = new Place(level, percen, each.Score, radix, this.Count);
}
else
{
places.Add(scorename, new Place(level, percen, each.Score, radix, this.Count));
}
}
}
