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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
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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_EmptySequenceType_H
#define Patternist_EmptySequenceType_H
#include <private/qatomictype_p.h>
#include <private/qsequencetype_p.h>
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Represents the <tt>empty-sequence()</tt> type.
*
* @ingroup Patternist_types
* @author Frans Englich <frans.englich@nokia.com>
*/
class EmptySequenceType : public ItemType,
public SequenceType
{
public:
typedef QExplicitlySharedDataPointer<EmptySequenceType> Ptr;
/**
* Possibly surprisingly, this function also returns true for the @c none type.
*
* @returns @c true if @p other is NoneType or EmptySequenceType, otherwise @c false.
*/
bool xdtTypeMatches(const ItemType::Ptr &other) const override;
/**
* @returns always @c false
*/
bool itemMatches(const Item &item) const override;
/**
* @returns always "empty-sequence()"
*/
QString displayName(const NamePool::Ptr &np) const override;
ItemType::Ptr xdtSuperType() const override;
bool isNodeType() const override;
bool isAtomicType() const override;
/**
* @return always Cardinality::empty()
*/
Cardinality cardinality() const override;
/**
* @returns always 'this' since it is also an ItemType
*/
ItemType::Ptr itemType() const override;
/**
* @returns always @c xs:anyAtomicType
*/
ItemType::Ptr atomizedType() const override;
protected:
friend class CommonSequenceTypes;
EmptySequenceType();
};
}
QT_END_NAMESPACE
#endif
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