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diff --git a/tools/assistant/lib/qhelpsearchindexreader.cpp b/tools/assistant/lib/qhelpsearchindexreader.cpp
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+++ b/tools/assistant/lib/qhelpsearchindexreader.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Assistant 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://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qhelpsearchindexreader_p.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace qt {
+    namespace fulltextsearch {
+
+QHelpSearchIndexReader::QHelpSearchIndexReader()
+    : QThread()
+    , m_cancel(false)
+{
+    // nothing todo
+}
+
+QHelpSearchIndexReader::~QHelpSearchIndexReader()
+{
+    mutex.lock();
+    this->m_cancel = true;
+    mutex.unlock();
+
+    wait();
+}
+
+void QHelpSearchIndexReader::cancelSearching()
+{
+    mutex.lock();
+    this->m_cancel = true;
+    mutex.unlock();
+}
+
+void QHelpSearchIndexReader::search(const QString &collectionFile, const QString &indexFilesFolder,
+    const QList<QHelpSearchQuery> &queryList)
+{
+    wait();
+
+    this->hitList.clear();
+    this->m_cancel = false;
+    this->m_query = queryList;
+    this->m_collectionFile = collectionFile;
+    this->m_indexFilesFolder = indexFilesFolder;
+
+    start(QThread::NormalPriority);
+}
+
+int QHelpSearchIndexReader::hitsCount() const
+{
+    QMutexLocker lock(&mutex);
+    return hitList.count();
+}
+
+QList<QHelpSearchEngine::SearchHit> QHelpSearchIndexReader::hits(int start,
+                                                                 int end) const
+{
+    QList<QHelpSearchEngine::SearchHit> hits;
+    QMutexLocker lock(&mutex);
+    for (int i = start; i < end && i < hitList.count(); ++i)
+        hits.append(hitList.at(i));
+    return hits;
+}
+
+
+    }   // namespace fulltextsearch
+}   // namespace qt
+
+QT_END_NAMESPACE