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/****************************************************************************
**
** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns 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.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QVariant>
#include "qabstractxmlnodemodel_p.h"
#include "qitemmappingiterator_p.h"
#include "qitem_p.h"
#include "qxmlname.h"
#include "qxmlquery_p.h"
#include "qpullbridge_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
/*!
\brief Bridges a QPatternist::SequenceIterator to QAbstractXmlPullProvider.
\class QPatternist::PullBridge
\internal
\reentrant
\ingroup xml-tools
The approach of this class is rather straight forward since QPatternist::SequenceIterator
and QAbstractXmlPullProvider are conceptually similar. While QPatternist::SequenceIterator only
delivers top level items(since it's not an event stream, it's a list of items), PullBridge
needs to recursively iterate the children of nodes too, which is achieved through the
stack m_iterators.
*/
AbstractXmlPullProvider::Event PullBridge::next()
{
m_index = m_iterators.top().second->next();
if(!m_index.isNull())
{
Item item(m_index);
if(item && item.isAtomicValue())
m_current = AtomicValue;
else
{
Q_ASSERT(item.isNode());
switch(m_index.kind())
{
case QXmlNodeModelIndex::Attribute:
{
m_current = Attribute;
break;
}
case QXmlNodeModelIndex::Comment:
{
m_current = Comment;
break;
}
case QXmlNodeModelIndex::Element:
{
m_iterators.push(qMakePair(StartElement, m_index.iterate(QXmlNodeModelIndex::AxisChild)));
m_current = StartElement;
break;
}
case QXmlNodeModelIndex::Document:
{
m_iterators.push(qMakePair(StartDocument, m_index.iterate(QXmlNodeModelIndex::AxisChild)));
m_current = StartDocument;
break;
}
case QXmlNodeModelIndex::Namespace:
{
m_current = Namespace;
break;
}
case QXmlNodeModelIndex::ProcessingInstruction:
{
m_current = ProcessingInstruction;
break;
}
case QXmlNodeModelIndex::Text:
{
m_current = Text;
break;
}
}
}
}
else
{
if(m_iterators.isEmpty())
m_current = EndOfInput;
else
{
switch(m_iterators.top().first)
{
case StartOfInput:
{
m_current = EndOfInput;
break;
}
case StartElement:
{
m_current = EndElement;
m_iterators.pop();
break;
}
case StartDocument:
{
m_current = EndDocument;
m_iterators.pop();
break;
}
default:
{
Q_ASSERT_X(false, Q_FUNC_INFO,
"Invalid value.");
m_current = EndOfInput;
}
}
}
}
return m_current;
}
AbstractXmlPullProvider::Event PullBridge::current() const
{
return m_current;
}
QXmlNodeModelIndex PullBridge::index() const
{
return m_index;
}
QSourceLocation PullBridge::sourceLocation() const
{
return m_index.model()->sourceLocation(m_index);
}
QXmlName PullBridge::name() const
{
return m_index.name();
}
QVariant PullBridge::atomicValue() const
{
return QVariant();
}
QString PullBridge::stringValue() const
{
return QString();
}
QHash<QXmlName, QString> PullBridge::attributes()
{
Q_ASSERT(m_current == StartElement);
QHash<QXmlName, QString> attributes;
QXmlNodeModelIndex::Iterator::Ptr it = m_index.iterate(QXmlNodeModelIndex::AxisAttribute);
QXmlNodeModelIndex index = it->next();
while (!index.isNull()) {
const Item attribute(index);
attributes.insert(index.name(), index.stringValue());
index = it->next();
}
return attributes;
}
QHash<QXmlName, QXmlItem> PullBridge::attributeItems()
{
Q_ASSERT(m_current == StartElement);
QHash<QXmlName, QXmlItem> attributes;
QXmlNodeModelIndex::Iterator::Ptr it = m_index.iterate(QXmlNodeModelIndex::AxisAttribute);
QXmlNodeModelIndex index = it->next();
while (!index.isNull()) {
const Item attribute(index);
attributes.insert(index.name(), QXmlItem(index));
index = it->next();
}
return attributes;
}
QT_END_NAMESPACE
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