source: trunk/src/xmlpatterns/api/qpullbridge.cpp@ 617

Last change on this file since 617 was 561, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.6.1 sources.
  • Property svn:eol-style set to native
File size: 6.7 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the QtXmlPatterns module of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
14** a written agreement between you and Nokia.
15**
16** GNU Lesser General Public License Usage
17** Alternatively, this file may be used under the terms of the GNU Lesser
18** General Public License version 2.1 as published by the Free Software
19** Foundation and appearing in the file LICENSE.LGPL included in the
20** packaging of this file. Please review the following information to
21** ensure the GNU Lesser General Public License version 2.1 requirements
22** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
23**
24** In addition, as a special exception, Nokia gives you certain additional
25** rights. These rights are described in the Nokia Qt LGPL Exception
26** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you have questions regarding the use of this file, please contact
37** Nokia at [email protected].
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#include <QVariant>
43
44#include "qabstractxmlnodemodel_p.h"
45#include "qitemmappingiterator_p.h"
46#include "qitem_p.h"
47#include "qxmlname.h"
48#include "qxmlquery_p.h"
49
50#include "qpullbridge_p.h"
51
52QT_BEGIN_NAMESPACE
53
54using namespace QPatternist;
55
56/*!
57 \brief Bridges a QPatternist::SequenceIterator to QAbstractXmlPullProvider.
58 \class QPatternist::PullBridge
59 \internal
60 \reentrant
61 \ingroup xml-tools
62
63 The approach of this class is rather straight forward since QPatternist::SequenceIterator
64 and QAbstractXmlPullProvider are conceptually similar. While QPatternist::SequenceIterator only
65 delivers top level items(since it's not an event stream, it's a list of items), PullBridge
66 needs to recursively iterate the children of nodes too, which is achieved through the
67 stack m_iterators.
68 */
69
70AbstractXmlPullProvider::Event PullBridge::next()
71{
72 m_index = m_iterators.top().second->next();
73
74 if(!m_index.isNull())
75 {
76 Item item(m_index);
77
78 if(item && item.isAtomicValue())
79 m_current = AtomicValue;
80 else
81 {
82 Q_ASSERT(item.isNode());
83
84 switch(m_index.kind())
85 {
86 case QXmlNodeModelIndex::Attribute:
87 {
88 m_current = Attribute;
89 break;
90 }
91 case QXmlNodeModelIndex::Comment:
92 {
93 m_current = Comment;
94 break;
95 }
96 case QXmlNodeModelIndex::Element:
97 {
98 m_iterators.push(qMakePair(StartElement, m_index.iterate(QXmlNodeModelIndex::AxisChild)));
99 m_current = StartElement;
100 break;
101 }
102 case QXmlNodeModelIndex::Document:
103 {
104 m_iterators.push(qMakePair(StartDocument, m_index.iterate(QXmlNodeModelIndex::AxisChild)));
105 m_current = StartDocument;
106 break;
107 }
108 case QXmlNodeModelIndex::Namespace:
109 {
110 m_current = Namespace;
111 break;
112 }
113 case QXmlNodeModelIndex::ProcessingInstruction:
114 {
115 m_current = ProcessingInstruction;
116 break;
117 }
118 case QXmlNodeModelIndex::Text:
119 {
120 m_current = Text;
121 break;
122 }
123 }
124 }
125 }
126 else
127 {
128 if(m_iterators.isEmpty())
129 m_current = EndOfInput;
130 else
131 {
132 switch(m_iterators.top().first)
133 {
134 case StartOfInput:
135 {
136 m_current = EndOfInput;
137 break;
138 }
139 case StartElement:
140 {
141 m_current = EndElement;
142 m_iterators.pop();
143 break;
144 }