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authorLars Knoll <lars.knoll@nokia.com>2009-03-23 09:18:55 (GMT)
committerSimon Hausmann <simon.hausmann@nokia.com>2009-03-23 09:18:55 (GMT)
commite5fcad302d86d316390c6b0f62759a067313e8a9 (patch)
treec2afbf6f1066b6ce261f14341cf6d310e5595bc1 /src/xmlpatterns/iterators/qexceptiterator.cpp
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Long live Qt 4.5!
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+/****************************************************************************
+**
+** 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.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qitem_p.h"
+
+#include "qexceptiterator_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace QPatternist;
+
+ExceptIterator::ExceptIterator(const Item::Iterator::Ptr &it1,
+ const Item::Iterator::Ptr &it2) : m_it1(it1)
+ , m_it2(it2)
+ , m_position(0)
+ , m_node1(m_it1->next())
+ , m_node2(m_it2->next())
+{
+ Q_ASSERT(m_it1);
+ Q_ASSERT(m_it2);
+}
+
+Item ExceptIterator::fromFirstOperand()
+{
+ ++m_position;
+ m_current = m_node1;
+ m_node1 = m_it1->next();
+
+ return m_current;
+}
+
+Item ExceptIterator::next()
+{
+ while(true)
+ {
+ if(!m_node1)
+ {
+ m_position = -1;
+ m_current = Item();
+ return Item();
+ }
+ else if(!m_node2)
+ return fromFirstOperand();
+
+ if(m_node1.asNode().model() != m_node2.asNode().model())
+ return fromFirstOperand();
+
+ switch(m_node1.asNode().compareOrder(m_node2.asNode()))
+ {
+ case QXmlNodeModelIndex::Precedes:
+ return fromFirstOperand();
+ case QXmlNodeModelIndex::Follows:
+ {
+ m_node2 = m_it2->next();
+ if(m_node2)
+ continue;
+ else
+ return fromFirstOperand();
+ }
+ default:
+ {
+ m_node1 = m_it1->next();
+ m_node2 = m_it2->next();
+ }
+ }
+ }
+}
+
+Item ExceptIterator::current() const
+{
+ return m_current;
+}
+
+xsInteger ExceptIterator::position() const
+{
+ return m_position;
+}
+
+Item::Iterator::Ptr ExceptIterator::copy() const
+{
+ return Item::Iterator::Ptr(new ExceptIterator(m_it1->copy(), m_it2->copy()));
+}
+
+QT_END_NAMESPACE