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AbstractColumn.h

/***************************************************************************
    File                 : AbstractColumn.h
    Project              : SciDAVis
    Description          : Interface definition for data with column logic
    --------------------------------------------------------------------
    Copyright            : (C) 2007-2009 Tilman Benkert (thzs*gmx.net)
                           (replace * with @ in the email addresses) 

 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *  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 ABSTRACTCOLUMN_H
#define ABSTRACTCOLUMN_H

#include <QList>
#include <QString>
#include <QDateTime>
#include <QDate>
#include <QTime>
#include "lib/Interval.h"
#include "core/globals.h"
#include "core/AbstractAspect.h"

class Column;
class AbstractSimpleFilter;
class QStringList;

//! Interface definition for data with column logic
/**
  This is an abstract base class for column-based data, 
  i.e. mathematically a vector or technically a 1D array or list.
  It only defines the interface but has no data members itself. 

  Classes derived from this are typically table columns or outputs
  of filters which can be chained between table columns and plots. 
  From the point of view of the plot functions there will be no difference 
  between a table column and a filter output since both use this interface.

  Classes derived from this will either store a 
  vector with entries of one certain data type, e.g. double, QString, 
  QDateTime, or generate such values on demand. To determine the data
  type of a class derived from this, use the dataType() function. 
  AbstractColumn defines all access functions for all supported data 
  types but only those corresponding to the return value of dataType() 
  will return a meaningful value. Calling functions not belonging to 
  the data type of the column is safe, but will do nothing (writing
  function) or return some default value (reading functions).

  This class also defines all signals which indicate a data change.
  Any class whose output values are subject to change over time must emit
  the according signals. These signals notify any object working with the
  column before and after a change of the column.
  In some cases it will be necessary for a class using 
  the column to connect aboutToBeDestroyed(), to react 
  to a column's deletion, e.g. a filter's reaction to a 
  table deletion.

  All writing functions have a "do nothing" standard implementation to
  make deriving a read-only class very easy without bothering about the
  writing interface. 
  */
00080 class AbstractColumn : public AbstractAspect
{
      Q_OBJECT

      public:
            //! Ctor
00086             AbstractColumn(const QString& name) : AbstractAspect(name) {}
            //! Dtor
00088             virtual ~AbstractColumn() { aboutToBeDestroyed(this);}

            //! Return the data type of the column
            virtual SciDAVis::ColumnDataType dataType() const = 0;
            //! Return whether the object is read-only
00093             virtual bool isReadOnly() const { return true; };
            //! Return the column mode
            /*
             * This function is most used by tables but can also be used
             * by plots. The column mode specifies how to interpret 
             * the values in the column additional to the data type.
             */ 
            virtual SciDAVis::ColumnMode columnMode() const = 0;
            //! Set the column mode
            /**
             * This sets the column mode and, if
             * necessary, converts it to another datatype.
             */
00106             virtual void setColumnMode(SciDAVis::ColumnMode mode) { Q_UNUSED(mode) };
            //! Copy another column of the same type
            /**
             * This function will return false if the data type
             * of 'other' is not the same as the type of 'this'.
             * The validity information for the rows is also copied.
             * Use a filter to convert a column to another type.
             */
00114             virtual bool copy(const AbstractColumn * other) { Q_UNUSED(other) return false; };
            //! Copies part of another column of the same type
            /**
             * This function will return false if the data type
             * of 'other' is not the same as the type of 'this'.
             * The validity information for the rows is also copied.
             * \param other pointer to the column to copy
             * \param src_start first row to copy in the column to copy
             * \param dest_start first row to copy in
             * \param num_rows the number of rows to copy
             */ 
00125             virtual bool copy(const AbstractColumn * source, int source_start, int dest_start, int num_rows) 
            {
                  Q_UNUSED(source)
                  Q_UNUSED(source_start)
                  Q_UNUSED(dest_start)
                  Q_UNUSED(num_rows)
                  return false; 
            };

            //! Return the data vector size
            virtual int rowCount() const = 0;
            //! Insert some empty (or initialized with zero) rows
00137             virtual void insertRows(int before, int count) { Q_UNUSED(before) Q_UNUSED(count) };
            //! Remove 'count' rows starting from row 'first'
00139             virtual void removeRows(int first, int count) { Q_UNUSED(first) Q_UNUSED(count) };
            //! Return the column plot designation
            virtual SciDAVis::PlotDesignation plotDesignation() const = 0;
            //! Set the column plot designation
            //virtual void setPlotDesignation(SciDAVis::PlotDesignation pd) { Q_UNUSED(pd) };
            //! Clear the whole column
00145             virtual void clear() {};
            //! This must be called before the column is replaced by another
00147             virtual void notifyReplacement(const AbstractColumn *replacement) { aboutToBeReplaced(this, replacement); }

            //! \name IntervalAttribute related functions
            //@{
            //! Return whether a certain row contains an invalid value   
00152             virtual bool isInvalid(int row) const { return !Interval<int>(0, rowCount()-1).contains(row); }        
            //! Return whether a certain interval of rows contains only invalid values     
00154             virtual bool isInvalid(Interval<int> i) const { return !Interval<int>(0, rowCount()-1).contains(i); }        
            //! Return all intervals of invalid rows
00156             virtual QList< Interval<int> > invalidIntervals() const { return QList< Interval<int> >(); }     
            //! Return whether a certain row is masked       
00158             virtual bool isMasked(int row) const { Q_UNUSED(row); return false; }    
            //! Return whether a certain interval of rows rows is fully masked       
00160             virtual bool isMasked(Interval<int> i) const { Q_UNUSED(i); return false; }
            //! Return all intervals of masked rows
00162             virtual QList< Interval<int> > maskedIntervals() const { return QList< Interval<int> >(); }      
            //! Clear all validity information
00164             virtual void clearValidity() {};
            //! Clear all masking information
00166             virtual void clearMasks() {};
            //! Set an interval invalid or valid
            /**
             * \param i the interval
             * \param invalid true: set invalid, false: set valid
             */ 
            //virtual void setInvalid(Interval<int> i, bool invalid = true) { Q_UNUSED(i) Q_UNUSED(invalid) };
            //! Overloaded function for convenience
            //virtual void setInvalid(int row, bool invalid = true) { Q_UNUSED(row) Q_UNUSED(invalid) };
            //! Set an interval masked
            /**
             * \param i the interval
             * \param mask true: mask, false: unmask
             */ 
            //virtual void setMasked(Interval<int> i, bool mask = true) { Q_UNUSED(i) Q_UNUSED(mask) };
            //! Overloaded function for convenience
            //virtual void setMasked(int row, bool mask = true) { Q_UNUSED(row) Q_UNUSED(mask) };
            //@}

            //! \name Formula related functions
            //@{
            //! Return the formula associated with row 'row'       
00188             virtual QString formula(int row) const { Q_UNUSED(row); return QString(); }
            //! Return the intervals that have associated formulas
            /**
             * This can be used to make a list of formulas with their intervals.
             * Here is some example code:
             *
             * \code
             * QStringList list;
             * QList< Interval<int> > intervals = my_column.formulaIntervals();
             * foreach(Interval<int> interval, intervals)
             *    list << QString(interval.toString() + ": " + my_column.formula(interval.start()));
             * \endcode
             */
00201             virtual QList< Interval<int> > formulaIntervals() const { return QList< Interval<int> >(); }
            //! Set a formula string for an interval of rows
            //virtual void setFormula(Interval<int> i, QString formula) { Q_UNUSED(i) Q_UNUSED(formula) };
            //! Overloaded function for convenience
            //virtual void setFormula(int row, QString formula) { Q_UNUSED(row) Q_UNUSED(formula) };
            //! Clear all formulas
00207             virtual void clearFormulas() {};
            //@}
            
            //! \name type specific functions
            //@{
            //! Return the content of row 'row'.
            /**
             * Use this only when dataType() is QString
             */
00216             virtual QString textAt(int row) const { Q_UNUSED(row); return ""; }
            //! Set the content of row 'row'
            /**
             * Use this only when dataType() is QString
             */
            //virtual void setTextAt(int row, const QString& new_value) { Q_UNUSED(row) Q_UNUSED(new_value) };
            //! Replace a range of values 
            /**
             * Use this only when dataType() is QString
             */
00226             virtual void replaceTexts(int first, const QStringList& new_values) { Q_UNUSED(first) Q_UNUSED(new_values) };
            //! Return the date part of row 'row'
            /**
             * Use this only when dataType() is QDateTime
             */
00231             virtual QDate dateAt(int row) const { Q_UNUSED(row); return QDate(); };
            //! Set the content of row 'row'
            /**
             * Use this only when dataType() is QDateTime
             */
            //virtual void setDateAt(int row, const QDate& new_value) { Q_UNUSED(row) Q_UNUSED(new_value) };
            //! Return the time part of row 'row'
            /**
             * Use this only when dataType() is QDateTime
             */
00241             virtual QTime timeAt(int row) const { Q_UNUSED(row); return QTime(); };
            //! Set the content of row 'row'
            /**
             * Use this only when dataType() is QDateTime
             */
            //virtual void setTimeAt(int row, const QTime& new_value) { Q_UNUSED(row) Q_UNUSED(new_value) };
            //! Return the QDateTime in row 'row'
            /**
             * Use this only when dataType() is QDateTime
             */
00251             virtual QDateTime dateTimeAt(int row) const { Q_UNUSED(row); return QDateTime(); };
            //! Set the content of row 'row'
            /**
             * Use this only when dataType() is QDateTime
             */
            //virtual void setDateTimeAt(int row, const QDateTime& new_value) { Q_UNUSED(row) Q_UNUSED(new_value) };
            //! Replace a range of values 
            /**
             * Use this only when dataType() is QDateTime
             */
00261             virtual void replaceDateTimes(int first, const QList<QDateTime>& new_values) { Q_UNUSED(first) Q_UNUSED(new_values) };
            //! Return the double value in row 'row'
            /**
             * Use this only when dataType() is double
             */
00266             virtual double valueAt(int row) const { Q_UNUSED(row); return 0; };
            //! Set the content of row 'row'
            /**
             * Use this only when dataType() is double
             */
            //virtual void setValueAt(int row, double new_value) { Q_UNUSED(row) Q_UNUSED(new_value) };
            //! Replace a range of values 
            /**
             * Use this only when dataType() is double
             */
00276             virtual void replaceValues(int first, const QVector<double>& new_values) { Q_UNUSED(first) Q_UNUSED(new_values) };
            //@}

      signals: 
            //! Column plot designation will be changed
            /**
             * 'source' is always the this pointer of the column that
             * emitted this signal. This way it's easier to use
             * one handler for lots of columns.
             */
            void plotDesignationAboutToChange(const AbstractColumn * source); 
            //! Column plot designation changed
            /**
             * 'source' is always the this pointer of the column that
             * emitted this signal. This way it's easier to use
             * one handler for lots of columns.
             */
            void plotDesignationChanged(const AbstractColumn * source); 
            //! Column mode (possibly also the data type) will be changed
            /**
             * 'source' is always the this pointer of the column that
             * emitted this signal. This way it's easier to use
             * one handler for lots of columns.
             */
            void modeAboutToChange(const AbstractColumn * source); 
            //! Column mode (possibly also the data type) changed
            /**
             * 'source' is always the this pointer of the column that
             * emitted this signal. This way it's easier to use
             * one handler for lots of columns.
             */
            void modeChanged(const AbstractColumn * source); 
            //! Data (including validity) of the column will be changed
            /**
             * 'source' is always the this pointer of the column that
             * emitted this signal. This way it's easier to use
             * one handler for lots of columns.
             */
            void dataAboutToChange(const AbstractColumn * source); 
            //! Data (including validity) of the column has changed
            /**
             * Important: When data has changed also the number
             * of rows in the column may have changed without
             * any other signal emission.
             * 'source' is always the this pointer of the column that
             * emitted this signal. This way it's easier to use
             * one handler for lots of columns.
             */
            void dataChanged(const AbstractColumn * source); 
            //! The column will be replaced
            /**
             * This is used then a column is replaced by another
             * column, possibly of another type. 
             *
             * \param new_col Pointer to the column this one is to be replaced with.
             *
             * \param source is always a pointer to the column that
             * emitted this signal. This way it's easier to use
             * one handler for lots of columns.
             */
            void aboutToBeReplaced(const AbstractColumn * source, const AbstractColumn* new_col); 
            //! Rows will be inserted
            /**
             *    \param source the column that emitted the signal
             *    \param before the row to insert before
             *    \param count the number of rows to be inserted
             */
            void rowsAboutToBeInserted(const AbstractColumn * source, int before, int count); 
            //! Rows have been inserted
            /**
             *    \param source the column that emitted the signal
             *    \param before the row to insert before
             *    \param count the number of rows to be inserted
             */
            void rowsInserted(const AbstractColumn * source, int before, int count); 
            //! Rows will be deleted
            /**
             *    \param source the column that emitted the signal
             *    \param first the first row to be deleted
             *    \param count the number of rows to be deleted
             */
            void rowsAboutToBeRemoved(const AbstractColumn * source, int first, int count); 
            //! Rows have been deleted
            /**
             *    \param source the column that emitted the signal
             *    \param first the first row that was deleted
             *    \param count the number of deleted rows
             */
            void rowsRemoved(const AbstractColumn * source, int first, int count); 
            //! IntervalAttribute related signal
            void maskingAboutToChange(const AbstractColumn * source); 
            //! IntervalAttribute related signal
            void maskingChanged(const AbstractColumn * source); 
            // TODO: Check whether aboutToBeDestroyed is needed 
            //! Emitted shortly before this data source is deleted.
            /**
             * \param source the object emitting this signal
             *
             * This is needed by AbstractFilter. 
             */
            void aboutToBeDestroyed(const AbstractColumn * source);

      friend class ColumnPrivate;
      friend class AbstractSimpleFilter;
      friend class SimpleMappingFilter;
      friend class SimpleCopyThroughFilter;
};

#endif

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