public virtual ITimeSeries Zoomout(TimeUnit tu, DateTime begin, DateTime end)
{
Func <List <T>, T> merger = this.getElementMerger();
if (merger == null)
{
return(null);
}
if (this.Count <= 0)
{
return(null);
}
if (begin < this[0].Date)
{
begin = this[0].Date;
}
if (end > this[this.Count - 1].Date)
{
end = this[this.Count - 1].Date;
}
List <T> items = new List <T>();
TimeSeries <T> result = (TimeSeries <T>) this.GetType().GetConstructor(new Type[] { typeof(String), typeof(TimeUnit) }).Invoke(new Object[] { code, tu });
/*
* DateTime d = begin;
* KeyValuePair<int, ITimeSeriesItem> kv = this.GetNearest(d);
* if (kv.Value == null)
* return null;
* int index = kv.Key;
* while(index < this.Count)
* {
* int n = CalendarUtils.TimeUnitGetSerialNo(this[index].Date,tu);
* if (n == 1)
* break;
* index += 1;
* }
*
* DateTime[] dayRange = null;
* for (int i=index;i<this.Count;i++)
* {
* d = this[i].Date;
* if(dayRange == null)
* dayRange = CalendarUtils.TimeUnitRange(d, tu);
* if(d<=dayRange[1])
* {
* items.Add(this[i]);
* continue;
* }
* T newItem = merger(items);
* if (newItem != null)
* result.Add(newItem);
* dayRange = null;
*
* }
*/
DateTime d = begin;
while (d <= end)
{
DateTime[] dayRange = CalendarUtils.TimeUnitRange(d, tu); //找到d所在的周期的第一天
KeyValuePair <int, ITimeSeriesItem> kvBegin = this.GetNearest(dayRange[0]);
KeyValuePair <int, ITimeSeriesItem> kvEnd = this.GetNearest(dayRange[1]);
items.Clear();
for (int i = kvBegin.Key; i <= kvEnd.Key; i++)
{
items.Add(this[i]);
}
T newItem = merger(items);
if (newItem != null)
{
result.Add(newItem);
}
d = CalendarUtils.TimeUnitNextDate(d, tu);
}
return(result);
}
