1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the QtXmlPatterns module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40//
41// W A R N I N G
42// -------------
43//
44// This file is not part of the Qt API. It exists purely as an
45// implementation detail. This header file may change from version to
46// version without notice, or even be removed.
47//
48// We mean it.
49
50#ifndef Patternist_EmptySequenceType_H
51#define Patternist_EmptySequenceType_H
52
53#include <private/qatomictype_p.h>
54#include <private/qsequencetype_p.h>
55
56QT_BEGIN_NAMESPACE
57
58namespace QPatternist
59{
60
61 /**
62 * @short Represents the <tt>empty-sequence()</tt> type.
63 *
64 * @ingroup Patternist_types
65 * @author Frans Englich <frans.englich@nokia.com>
66 */
67 class EmptySequenceType : public ItemType,
68 public SequenceType
69 {
70 public:
71 typedef QExplicitlySharedDataPointer<EmptySequenceType> Ptr;
72
73 /**
74 * Possibly surprisingly, this function also returns true for the @c none type.
75 *
76 * @returns @c true if @p other is NoneType or EmptySequenceType, otherwise @c false.
77 */
78 bool xdtTypeMatches(const ItemType::Ptr &other) const override;
79
80 /**
81 * @returns always @c false
82 */
83 bool itemMatches(const Item &item) const override;
84
85 /**
86 * @returns always "empty-sequence()"
87 */
88 QString displayName(const NamePool::Ptr &np) const override;
89
90 ItemType::Ptr xdtSuperType() const override;
91
92 bool isNodeType() const override;
93 bool isAtomicType() const override;
94
95 /**
96 * @return always Cardinality::empty()
97 */
98 Cardinality cardinality() const override;
99
100 /**
101 * @returns always 'this' since it is also an ItemType
102 */
103 ItemType::Ptr itemType() const override;
104
105 /**
106 * @returns always @c xs:anyAtomicType
107 */
108 ItemType::Ptr atomizedType() const override;
109
110 protected:
111 friend class CommonSequenceTypes;
112 EmptySequenceType();
113 };
114}
115
116QT_END_NAMESPACE
117
118#endif
119

source code of qtxmlpatterns/src/xmlpatterns/type/qemptysequencetype_p.h