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/**********************************************************************
** Copyright (C) 2000-2002 Trolltech AS. All rights reserved.
**
** This file is part of the Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#ifndef QTPALMTOP_UIDGEN_H
#define QTPALMTOP_UIDGEN_H
#include <time.h>
#include <qmap.h>
#include "qpcglobal.h"
#if defined(QPC_TEMPLATEDLL)
// MOC_SKIP_BEGIN
QPC_TEMPLATEEXTERN template class QPC_EXPORT QMap< int, bool >;
// MOC_SKIP_END
#endif
namespace Qtopia {
class QPC_EXPORT UidGen
{
public:
enum Type { Qtopia, PalmtopCenter };
UidGen() : type( Qtopia ), sign( -1 ), ids()
{
#ifdef PALMTOPCENTER
type = PalmtopCenter;
sign = 1;
#endif
}
UidGen( Type t ) : type(t), sign(1), ids()
{
if ( t == Qtopia )
sign = -1;
}
virtual ~UidGen() { }
int generate() const
{
int id = sign * (int) ::time(NULL);
while ( ids.contains( id ) ) {
id += sign;
// check for overflow cases; if so, wrap back to beginning of
// set ( -1 or 1 )
if ( sign == -1 && id > 0 || sign == 1 && id < 0 )
id = sign;
}
return id;
}
void store(int id) { ids.insert(id, TRUE); }
bool isUnique(int id) const { return (!ids.contains(id)); }
private:
Type type;
int sign;
QMap<int, bool> ids;
};
}
#endif
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