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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/qsubsequenceiterator.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 "qxpathhelper_p.h"
+
+#include "qsubsequenceiterator_p.h"
+
+QT_BEGIN_NAMESPACE
+
+using namespace QPatternist;
+
+SubsequenceIterator::SubsequenceIterator(const Item::Iterator::Ptr &iterator,
+ const xsInteger start,
+ const xsInteger len)
+ : m_position(0),
+ m_it(iterator),
+ m_counter(start),
+ m_start(start),
+ m_len(len),
+ m_stop(m_start + m_len)
+{
+ Q_ASSERT(iterator);
+ Q_ASSERT(start >= 1);
+ Q_ASSERT(len == -1 || len >= 1);
+
+ /* Note, "The first item of a sequence is located at position 1, not position 0." */
+ for(xsInteger i = 1; i != m_start; ++i)
+ m_it->next();
+}
+
+Item SubsequenceIterator::next()
+{
+ if(m_position == -1)
+ return Item();
+
+ m_current = m_it->next();
+ ++m_position;
+
+ if(m_len == -1)
+ {
+ if(!m_current)
+ m_position = -1;
+
+ return m_current;
+ }
+
+ ++m_counter;
+
+ if(!(m_counter > m_stop) && m_current)
+ return m_current;
+
+ m_position = -1;
+ m_current.reset();
+ return Item();
+}
+
+Item SubsequenceIterator::current() const
+{
+ return m_current;
+}
+
+xsInteger SubsequenceIterator::position() const
+{
+ return m_position;
+}
+
+Item::Iterator::Ptr SubsequenceIterator::copy() const
+{
+ return Item::Iterator::Ptr(new SubsequenceIterator(m_it->copy(), m_start, m_len));
+}
+
+QT_END_NAMESPACE