Double2MonthFilter.h

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/***************************************************************************
    File                 : Double2MonthFilter.h
    Project              : SciDAVis
    --------------------------------------------------------------------
    Copyright            : (C) 2007 by Knut Franke, Tilman Benkert
    Email (use @ for *)  : knut.franke*gmx.de, thzs@gmx.net
    Description          : Conversion filter double -> QDateTime, interpreting
                           the input numbers as months of the year.
                           
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *  This program is free software; you can redistribute it and/or modify   *
 *  it under the terms of the GNU General Public License as published by   *
 *  the Free Software Foundation; either version 2 of the License, or      *
 *  (at your option) any later version.                                    *
 *                                                                         *
 *  This program is distributed in the hope that it will be useful,        *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 *  GNU General Public License for more details.                           *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor,                    *
 *   Boston, MA  02110-1301  USA                                           *
 *                                                                         *
 ***************************************************************************/
#ifndef DOUBLE2MONTH_FILTER_H
#define DOUBLE2MONTH_FILTER_H

#include "../AbstractSimpleFilter.h"
#include <QDateTime>
#include <math.h>
#include "lib/XmlStreamReader.h"
#include <QXmlStreamWriter>

class Double2MonthFilter : public AbstractSimpleFilter
{
    Q_OBJECT
    public:
        virtual QDate dateAt(int row) const {
            return dateTimeAt(row).date();
        }
        virtual QTime timeAt(int row) const {
            return dateTimeAt(row).time();
        }
        virtual QDateTime dateTimeAt(int row) const {
            if (!d_inputs.value(0)) return QDateTime();
            double input_value = d_inputs.value(0)->valueAt(row);
            // Don't use Julian days here since support for years < 1 is bad
            // Use 1900-01-01 instead
            QDate result_date = QDate(1900,1,1).addMonths(qRound(input_value - 1.0));
            QTime result_time = QTime(0,0,0,0);
            return QDateTime(result_date, result_time);
        }

        virtual SciDAVis::ColumnDataType dataType() const { return SciDAVis::TypeQDateTime; }

    protected:
        virtual bool inputAcceptable(int, const AbstractColumn *source) {
            return source->dataType() == SciDAVis::TypeDouble;
        }
};

#endif // ifndef DOUBLE2MONTH_FILTER_H