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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_EmptySequence_H
#define Patternist_EmptySequence_H
#include <private/qemptycontainer_p.h>
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Implements the value instance of empty sequence: <tt>()</tt>.
*
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_xdm
*/
class EmptySequence : public EmptyContainer
{
public:
/**
* @short Creates an EmptySequence that is a replacement for @p
* replacementFor.
*
* @see EmptySequence()
*/
static Expression::Ptr create(const Expression *const replacementFor,
const StaticContext::Ptr &context);
/**
* @short Creates an instance of EmptySequence.
*
* @note In most cases create() should be used, since it takes care of
* adjusting source location annotations.
*
* @see create()
*/
inline EmptySequence()
{
}
virtual QString stringValue() const;
/**
* @returns always an empty iterator, an instance of EmptyIterator.
*/
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const;
/**
* @returns always @c null.
*/
virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
/**
* Does nothing.
*/
virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &) const;
/**
* @returns always @c false.
*/
virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
/**
* @returns always CommonSequenceTypes::Empty
*/
virtual ItemType::Ptr type() const;
/**
* @returns always CommonSequenceTypes::Empty
*/
virtual SequenceType::Ptr staticType() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
virtual ID id() const;
virtual Properties properties() const;
};
}
QT_END_NAMESPACE
#endif
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