Double2DateTimeFilter.cpp

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#include "Double2DateTimeFilter.h"
 
#include <math.h>
 
QDateTime Double2DateTimeFilter::dateTimeAt(int row) const {
    if (!d_inputs.value(0)) return QDateTime();
    double input_value = d_inputs.value(0)->valueAt(row);
    QDateTime result;
    // This gets a little messy, since QDate can't represent the reference date of JDN.
    // Thus, we manually interpret invalid dates as JDN reference.
    switch (m_unit_interval) {
        case Year:
            if (m_date_time_0.isValid())
                result = m_date_time_0.addYears(int(floor(input_value)));
            else {
                result.setDate(QDate(int(floor(input_value))+4713, 1, 1));
                result.setTime(QTime(12,0,0,0));
            }
            return result.addMSecs(qRound64((input_value - int(floor(input_value))) *
                        result.date().daysInYear() * 86400000.0));
        case Month:
            if (m_date_time_0.isValid())
                result = m_date_time_0.addMonths(int(floor(input_value)));
            else {
                result.setDate(QDate(int(floor(input_value))/12+4713, int(floor(input_value))%12+1, 1));
                result.setTime(QTime(12,0,0,0));
            }
            return result.addMSecs(qRound64((input_value - int(floor(input_value))) *
                        result.date().daysInMonth() * 86400000.0));
        case Day:
            if (m_date_time_0.isValid())
                result = m_date_time_0.addDays(int(floor(input_value)));
            else {
                result.setDate(QDate::fromJulianDay(int(floor(input_value))));
                result.setTime(QTime(12,0,0,0));
            }
            return result.addMSecs(qRound64((input_value - int(floor(input_value))) * 86400000.0));
        case Hour:
            if (m_date_time_0.isValid())
                return m_date_time_0.addMSecs(qRound64(input_value * 3600000.0));
            else {
                result.setDate(QDate::fromJulianDay(int(floor(input_value)) / 24));
                result.setTime(QTime(12,0,0,0));
                result = result.addSecs((int(floor(input_value)) % 24) * 3600);
                return result.addMSecs(qRound64((input_value - int(floor(input_value))) * 3600000.0));
            }
        case Minute:
            if (m_date_time_0.isValid())
                return m_date_time_0.addMSecs(qRound64(input_value * 60000.0));
            else {
                result.setDate(QDate::fromJulianDay(int(floor(input_value)) / (24 * 60)));
                result.setTime(QTime(12,0,0,0));
                result = result.addSecs((int(floor(input_value)) % (24 * 60)) * 60);
                return result.addMSecs(qRound64((input_value - int(floor(input_value))) * 60000.0));
            }
        case Second:
            if (m_date_time_0.isValid())
                return m_date_time_0.addMSecs(qRound64(input_value * 1000.0));
            else {
                result.setDate(QDate::fromJulianDay(int(floor(input_value)) / (24 * 60 * 60)));
                result.setTime(QTime(12,0,0,0));
                result = result.addSecs(int(floor(input_value)) % (24 * 60 * 60));
                return result.addMSecs(qRound64((input_value - int(floor(input_value))) * 1000.0));
            }
        case Millisecond:
            if (m_date_time_0.isValid())
                return m_date_time_0.addMSecs(qRound64(input_value));
            else {
                result.setDate(QDate::fromJulianDay(int(floor(input_value)) / (24 * 60 * 60)));
                result.setTime(QTime(12,0,0,0));
                result = result.addSecs(int(floor(input_value)) % (24 * 60 * 60));
                return result.addMSecs(qRound64((input_value - int(floor(input_value))) * 1000.0));
            }
    }
        return result;
}