internal Index(params IValueIter[] list)
{
// Handle special case of empty list.
if (list.Length == 0)
{
mLeftToIterate = 0;
return;
}
// Each ValueIter have a corresponding "offset" maintained
// locally in the Index object.
mStartOffset = new int[list.Length];
// Validate all synchronized.
// At the same time, identify the common range.
int begCommonRange;
int endCommonRange;
IValueIter valueIter = list[0];
endCommonRange = valueIter.GetEndTimestampOffset();
begCommonRange = valueIter.GetStartTimestampOffset();
mStartOffset[0] = begCommonRange;
if (list.Length > 1)
{
Timestamps refTimestamps = valueIter.GetTimestamps();
for (int i = 1; i < list.Length; i++)
{
valueIter = list[i];
if (!valueIter.GetTimestamps().Equals(refTimestamps))
{
throw new Exception("Iteration possible only for synchronized Timeseries and Variable");
}
int temp = valueIter.GetStartTimestampOffset();
if (temp > begCommonRange)
{
begCommonRange = temp;
}
mStartOffset[i] = temp;
temp = valueIter.GetEndTimestampOffset();
if (temp < endCommonRange)
{
endCommonRange = temp;
}
}
}
// The number of elements left to be iterated.
mLeftToIterate = endCommonRange - begCommonRange + 1;
// Handle case of an empty ValueIter or no common range.
if (mLeftToIterate <= 0)
{
mLeftToIterate = 0;
return;
}
// Now that the common range is known, adjust the starting
// offset for each ValueIter.
for (int i = 0; i < list.Length; i++)
{
mStartOffset[i] = begCommonRange - mStartOffset[i];
}
// Calculate the starting offset for the timestamp array.
mTimestampOffset = begCommonRange;
// Keep a reference on the list of ValueIter
mValueIter = list;
}
