/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkSortFileNames.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
// .NAME vtkSortFileNames - Group and sort a set of filenames
// .SECTION Description
// vtkSortFileNames will take a list of filenames (e.g. from
// a file load dialog) and sort them into one or more series.  If
// the input list of filenames contains any directories, these can
// be removed before sorting using the SkipDirectories flag.  This
// class should be used where information about the series groupings
// can be determined by the filenames, but it might not be successful
// in cases where the information about the series groupings is
// stored in the files themselves (e.g DICOM).
// .SECTION See Also
// vtkImageReader2

#ifndef __vtkSortFileNames_h
#define __vtkSortFileNames_h

#include "vtkObject.h"

class vtkStringArray;

//BTX
// this is a helper class defined in the .cxx file
class vtkStringArrayVector;
//ETX

class VTK_IO_EXPORT vtkSortFileNames : public vtkObject
{
public:
  
  vtkTypeRevisionMacro(vtkSortFileNames,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);   
  static vtkSortFileNames *New();

  // Description:
  // Sort the file names into groups, according to similarity in
  // filename name and path.  Files in different directories,
  // or with different extensions, or which do not fit into the same
  // numbered series will be placed into different groups.  This is
  // off by default.
  vtkSetMacro(Grouping, int);
  vtkGetMacro(Grouping, int);
  vtkBooleanMacro(Grouping, int);

  // Description:
  // Sort the files numerically, rather than lexicographically.
  // For filenames that contain numbers, this means the order will be
  // ["file8.dat", "file9.dat", "file10.dat"]
  // instead of the usual alphabetic sorting order
  // ["file10.dat" "file8.dat", "file9.dat"].
  // NumericSort is off by default.
  vtkSetMacro(NumericSort, int);
  vtkGetMacro(NumericSort, int);
  vtkBooleanMacro(NumericSort, int);

  // Description:
  // Ignore case when sorting.  This flag is honored by both
  // the sorting and the grouping. This is off by default.
  vtkSetMacro(IgnoreCase, int);
  vtkGetMacro(IgnoreCase, int);
  vtkBooleanMacro(IgnoreCase, int);

  // Description:
  // Skip directories. If this flag is set, any input item that
  // is a directory rather than a file will not be included in
  // the output.  This is off by default.
  vtkSetMacro(SkipDirectories, int);
  vtkGetMacro(SkipDirectories, int);
  vtkBooleanMacro(SkipDirectories, int);

  // Description:
  // Set a list of file names to group and sort.
  void SetInputFileNames(vtkStringArray *input);
  vtkGetObjectMacro(InputFileNames, vtkStringArray);
  
  // Description:
  // Get the full list of sorted filenames.
  virtual vtkStringArray *GetFileNames();

  // Description:
  // Get the number of groups that the names were split into, if
  // grouping is on.  The filenames are automatically split into
  // groups, where the filenames in each group will be identical
  // except for their series numbers.  If grouping is not on, this
  // method will return zero.
  virtual int GetNumberOfGroups();

  // Description:
  // Get the Nth group of file names.  This method should only
  // be used if grouping is on.  If grouping is off, it will always
  // return null.
  virtual vtkStringArray *GetNthGroup(int i);

  // Description:
  // Update the output filenames from the input filenames.
  // This method is called automatically by GetFileNames()
  // and GetNumberOfGroups() if the input names have changed.
  virtual void Update();

protected:
  vtkSortFileNames();
  ~vtkSortFileNames();

  int NumericSort;
  int IgnoreCase;
  int Grouping;
  int SkipDirectories;

  vtkTimeStamp UpdateTime;

  vtkStringArray *InputFileNames;
  vtkStringArray *FileNames;
  vtkStringArrayVector *Groups;

  // Description:
  // Fill the output.
  virtual void Execute();

  // Description:
  // Sort the input string array, and append the results to the output.
  virtual void SortFileNames(vtkStringArray *input, vtkStringArray *output);

  // Description:
  // Separate a string array into groups and append them to the output. 
  virtual void GroupFileNames(vtkStringArray *input,
                              vtkStringArrayVector *output);
  
  
private:
  vtkSortFileNames(const vtkSortFileNames&);  // Not implemented.
  void operator=(const vtkSortFileNames&);  // Not implemented.
};

#endif
