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
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (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 qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_CacheCells_H
#define Patternist_CacheCells_H
#include <QList>
#include <QVector>
#include "qitem_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Represents a cache entry for a single Item,
* as opposed to for a sequence of items.
*
* A characteristic of the ItemCacheCell is that it has two states:
* either its full or it's not, since it only deals with a single
* item.
*
* Remember that cachedItem doesn't tell the state of the ItemCacheCell.
* For instance, it can have a null pointer, the empty sequence, and that
* can be the value of its cache.
*
* @author Frans Englich <fenglich@trolltech.com>
*/
class ItemCacheCell
{
public:
typedef QList<ItemCacheCell> List;
typedef QVector<ItemCacheCell> Vector;
enum CacheState
{
Full,
Empty
};
inline ItemCacheCell() : cacheState(Empty)
{
}
Item cachedItem;
CacheState cacheState;
};
/**
* @short Represents a cache entry for a sequence of items.
*
* As opposed to ItemCacheCell, ItemSequenceCacheCell can be partially
* populated: e.g, four items is in the cache while three remains in the
* source. For that reason ItemSequenceCacheCell in addition to the source
* also carried an QAbstractXmlForwardIterator which is the source, such
* that it can continue to populate the cache when it runs out.
*
* @author Frans Englich <fenglich@trolltech.com>
*/
class ItemSequenceCacheCell
{
public:
typedef QList<ItemSequenceCacheCell> List;
typedef QVector<ItemSequenceCacheCell> Vector;
enum CacheState
{
Full,
Empty,
PartiallyPopulated
};
inline ItemSequenceCacheCell() : cacheState(Empty)
, inUse(false)
{
}
Item::List cachedItems;
Item::Iterator::Ptr sourceIterator;
CacheState cacheState;
/**
* In XSL-T, we can have circularity which we cannot detect statically.
* For instance, a global variable invokes a template, and the template
* uses the variable. We can't detect that, because we can't figure out
* what template will be invoked.
*
* For solution we have this toggle, which is set temporarily on the
* cell such that EvaluationCache can detect whether it's trashing
* itself.
*
* One might think that it would be sufficient to flag usage of the
* variable in an arbitrary template, but that would also flag valid
* cases.
*/
bool inUse;
};
}
Q_DECLARE_TYPEINFO(QPatternist::ItemCacheCell, Q_MOVABLE_TYPE);
Q_DECLARE_TYPEINFO(QPatternist::ItemSequenceCacheCell, Q_MOVABLE_TYPE);
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
