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/*
* Copyright (C) 1993-2009 Robert & Jeremy Laine
* See AUTHORS file for a full list of contributors.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef FILEWRITER_H
#define FILEWRITER_H
#ifdef WIN32
#define CRLF endl
#else
#define CRLF "\r\n"
#endif
#include <iostream>
#include <stdexcept>
#include <QFileDialog>
#include <QMessageBox>
using namespace std;
class read_error : public runtime_error
{
public:
read_error(const string &message) : runtime_error(message)
{
cout << what() << endl;
}
};
class write_error : public runtime_error
{
public:
write_error(const string &message) : runtime_error(message)
{
cout << what() << endl;
}
};
/** This is a generic class used as the base for various file
* input and output modules.
*/
template <class objtype>
class CFileWriter : public QObject
{
public:
/** The constructor.
*
* @param ext the file extension
* @param desc description of the file type
*/
CFileWriter(const QString &ext, const QString &desc) : _ext(ext), _desc(desc)
{}
;
/** Perform the actual reading operation, may be overriden
* to provide this functionality.
*/
virtual const objtype read(const QString &) const
{
throw logic_error("Reading is not supported for this file type.");
};
/** Display a dialog then read file.
*
* @param dest the object we read to
* @param filename initial file name
*/
QString readDialog(objtype &dest, const QString &filename = "") const
{
QString newfilename = QFileDialog::getOpenFileName(0, tr("Open"), QFileInfo(filename).absolutePath(), _desc + " (*" + _ext + ")");
if (!newfilename.isNull())
{
try
{
dest = read(newfilename);
}
catch (read_error e)
{
readErrorMessage();
newfilename = QString::null;
}
}
return newfilename;
};
/** Show an error message indicating that reading failed.
*/
static void readErrorMessage()
{
QMessageBox::information(0, tr("error"), tr("There was an error reading from the selected file."));
};
/** Perform the actual writing operation, must be overriden.
*/
virtual void write(const objtype &, const QString &) const = 0;
/** Opens of a dialog to ask for a filename
* then writes to a file.
*
* @param obj The object to write.
* @param filename The filename to start off with (default = "")
*/
QString writeDialog(const objtype &obj, const QString &filename = QString::null) const
{
QString newfilename = QFileDialog::getSaveFileName(0, tr("Save"), filename, _desc + " (*" + _ext + ")");
if (newfilename.isNull())
return newfilename;
if (newfilename.right(_ext.length()).toLower() != _ext)
newfilename += _ext;
try
{
write(obj, newfilename);
}
catch (write_error e)
{
writeErrorMessage();
newfilename = QString::null;
}
return newfilename;
};
/** Show an error message indicating that writing failed.
*/
static void writeErrorMessage()
{
QMessageBox::information(0, tr("error"), tr("There was an error writing to the selected file."));
};
/** Return the file extension associated with this CFileWriter.
*/
QString getExtension() const
{
return _ext;
};
/**
* Returns whether the given file is associated with this CFileWriter.
*/
bool isDocument(QString filename) const
{
return (filename.right(_ext.length()).toLower() == _ext);
};
protected:
/** file extension */
QString _ext;
/** description of the file type */
QString _desc;
};
#endif
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