/**************************************************************************** | |
** | |
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
** All rights reserved. | |
** Contact: Nokia Corporation (qt-info@nokia.com) | |
** | |
** This file is part of the QtXmlPatterns module of the Qt Toolkit. | |
** | |
** $QT_BEGIN_LICENSE:LGPL$ | |
** GNU Lesser General Public License Usage | |
** This file may be used under the terms of the GNU Lesser General Public | |
** License version 2.1 as published by the Free Software Foundation and | |
** appearing in the file LICENSE.LGPL included in the packaging of this | |
** file. Please review the following information to ensure the GNU Lesser | |
** General Public License version 2.1 requirements will be met: | |
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. | |
** | |
** In addition, as a special exception, Nokia gives you certain additional | |
** rights. These rights are described in the Nokia Qt LGPL Exception | |
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. | |
** | |
** GNU General Public License Usage | |
** Alternatively, this file may be used under the terms of the GNU General | |
** Public License version 3.0 as published by the Free Software Foundation | |
** and appearing in the file LICENSE.GPL included in the packaging of this | |
** file. Please review the following information to ensure the GNU General | |
** Public License version 3.0 requirements will be met: | |
** http://www.gnu.org/copyleft/gpl.html. | |
** | |
** Other Usage | |
** Alternatively, this file may be used in accordance with the terms and | |
** conditions contained in a signed written agreement between you and Nokia. | |
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// | |
// W A R N I N G | |
// ------------- | |
// | |
// This file is not part of the Qt API. It exists purely as an | |
// implementation detail. This header file may change from version to | |
// version without notice, or even be removed. | |
// | |
// We mean it. | |
#ifndef Patternist_EmptyContainer_H | |
#define Patternist_EmptyContainer_H | |
#include "qexpression_p.h" | |
QT_BEGIN_HEADER | |
QT_BEGIN_NAMESPACE | |
namespace QPatternist | |
{ | |
/** | |
* @short Base class for expressions that has no operands. | |
* | |
* @author Frans Englich <frans.englich@nokia.com> | |
* @ingroup Patternist_expressions | |
*/ | |
class Q_AUTOTEST_EXPORT EmptyContainer : public Expression | |
{ | |
public: | |
/** | |
* @returns always an empty list. | |
*/ | |
virtual Expression::List operands() const; | |
/** | |
* Does nothing, since sub-classes has no operands. Calling | |
* it makes hence no sense, and it also results in an assert crash. | |
*/ | |
virtual void setOperands(const Expression::List &); | |
protected: | |
/** | |
* @returns always @c true | |
*/ | |
virtual bool compressOperands(const StaticContext::Ptr &context); | |
/** | |
* @returns always an empty list since it has no operands. | |
*/ | |
virtual SequenceType::List expectedOperandTypes() const; | |
}; | |
} | |
QT_END_NAMESPACE | |
QT_END_HEADER | |
#endif |