1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, 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 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_OrderBy_H
#define Patternist_OrderBy_H
#include "qatomiccomparator_p.h"
#include "qcomparisonplatform_p.h"
#include "qsinglecontainer_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
class ReturnOrderBy;
/**
* @short Performs the sorting by being a parent to ForClause.
*
* The child of the ForClause is a ReturnOrderBy expression, which collects
* the sort keys and values.
*
* @author Frans Englich <fenglich@trolltech.com>
* @ingroup Patternist_expressions
*/
class OrderBy : public SingleContainer
{
public:
enum Stability
{
StableOrder,
UnstableOrder
};
/**
* This class is value based.
*/
class OrderSpec : public ComparisonPlatform<OrderBy::OrderSpec,
true, /* Yes, issue errors. */
AtomicComparator::AsValueComparison>
{
public:
/**
* We want this guy to be public.
*/
using ComparisonPlatform<OrderBy::OrderSpec, true, AtomicComparator::AsValueComparison>::detailedFlexibleCompare;
typedef QVector<OrderSpec> Vector;
enum Direction
{
Ascending,
Descending
};
/**
* @short Default constructor, which is needed by QVector.
*/
inline OrderSpec()
{
}
inline OrderSpec(const Direction dir,
const StaticContext::OrderingEmptySequence orderingEmpty) : direction(dir),
orderingEmptySequence(orderingEmpty)
{
}
void prepare(const Expression::Ptr &source,
const StaticContext::Ptr &context);
const SourceLocationReflection *actualReflection() const
{
return m_expr.data();
}
private:
Expression::Ptr m_expr;
public:
/**
* We place these afterwards, such that m_expr gets aligned at the
* start of the address.
*/
Direction direction;
StaticContext::OrderingEmptySequence orderingEmptySequence;
inline AtomicComparator::Operator operatorID() const
{
return orderingEmptySequence == StaticContext::Least ? AtomicComparator::OperatorLessThanNaNLeast
: AtomicComparator::OperatorLessThanNaNGreatest;
}
};
OrderBy(const Stability stability,
const OrderSpec::Vector &orderSpecs,
const Expression::Ptr &operand,
ReturnOrderBy *const returnOrderBy);
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;
virtual SequenceType::Ptr staticType() const;
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
virtual Expression::Ptr compress(const StaticContext::Ptr &context);
virtual SequenceType::List expectedOperandTypes() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
inline Item::Iterator::Ptr mapToSequence(const Item &i,
const DynamicContext::Ptr &context) const;
virtual Properties properties() const;
private:
/**
* Needed when calling makeSequenceMappingIterator().
*/
typedef QExplicitlySharedDataPointer<const OrderBy> ConstPtr;
const Stability m_stability;
OrderSpec::Vector m_orderSpecs;
ReturnOrderBy *const m_returnOrderBy;
};
/* TODO Q_DECLARE_TYPEINFO(OrderBy::OrderSpec, Q_MOVABLE_TYPE); Breaks,
* probably because it's nested. */
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
