Qt 4.8
qemptysequence_p.h
Go to the documentation of this file.
1 /****************************************************************************
2 **
3 ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
4 ** Contact: http://www.qt-project.org/legal
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 Digia. For licensing terms and
14 ** conditions see http://qt.digia.com/licensing. For further information
15 ** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
20 ** Foundation and appearing in the file LICENSE.LGPL included in the
21 ** packaging of this file. Please review the following information to
22 ** ensure the GNU Lesser General Public License version 2.1 requirements
23 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
24 **
25 ** In addition, as a special exception, Digia gives you certain additional
26 ** rights. These rights are described in the Digia Qt LGPL Exception
27 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
28 **
29 ** GNU General Public License Usage
30 ** Alternatively, this file may be used under the terms of the GNU
31 ** General Public License version 3.0 as published by the Free Software
32 ** Foundation and appearing in the file LICENSE.GPL included in the
33 ** packaging of this file. Please review the following information to
34 ** ensure the GNU General Public License version 3.0 requirements will be
35 ** met: http://www.gnu.org/copyleft/gpl.html.
36 **
37 **
38 ** $QT_END_LICENSE$
39 **
40 ****************************************************************************/
41 
42 //
43 // W A R N I N G
44 // -------------
45 //
46 // This file is not part of the Qt API. It exists purely as an
47 // implementation detail. This header file may change from version to
48 // version without notice, or even be removed.
49 //
50 // We mean it.
51 
52 #ifndef Patternist_EmptySequence_H
53 #define Patternist_EmptySequence_H
54 
55 #include "qemptycontainer_p.h"
56 
58 
60 
61 namespace QPatternist
62 {
70  {
71  public:
78  static Expression::Ptr create(const Expression *const replacementFor,
79  const StaticContext::Ptr &context);
80 
81 
90  inline EmptySequence()
91  {
92  }
93 
94  virtual QString stringValue() const;
95 
100 
104  virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
105 
109  virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &) const;
110 
114  virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
115 
119  virtual ItemType::Ptr type() const;
120 
124  virtual SequenceType::Ptr staticType() const;
125 
126  virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
127  virtual ID id() const;
128  virtual Properties properties() const;
129  };
130 }
131 
133 
135 
136 #endif
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const
#define QT_END_NAMESPACE
This macro expands to.
Definition: qglobal.h:90
Base class for all AST nodes in an XPath/XQuery/XSL-T expression.
#define QT_BEGIN_HEADER
Definition: qglobal.h:136
virtual QString stringValue() const
EmptySequence()
Creates an instance of EmptySequence.
virtual Item evaluateSingleton(const DynamicContext::Ptr &) const
The QString class provides a Unicode character string.
Definition: qstring.h:83
static Expression::Ptr create(const Expression *const replacementFor, const StaticContext::Ptr &context)
Creates an EmptySequence that is a replacement for replacementFor.
#define QT_BEGIN_NAMESPACE
This macro expands to.
Definition: qglobal.h:89
virtual SequenceType::Ptr staticType() const
virtual Properties properties() const
The namespace for the internal API of QtXmlPatterns.
Implements the value instance of empty sequence: ().
Represents an item in the XPath 2.0 Data Model.
Definition: qitem_p.h:182
virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &) const
virtual bool evaluateEBV(const DynamicContext::Ptr &context) const
Base class for expressions that has no operands.
virtual ItemType::Ptr type() const
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const
The QFlags class provides a type-safe way of storing OR-combinations of enum values.
Definition: qglobal.h:2313
#define QT_END_HEADER
Definition: qglobal.h:137