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diff --git a/src/lib/corelib/tools/persistence.h b/src/lib/corelib/tools/persistence.h
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+++ b/src/lib/corelib/tools/persistence.h
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+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Build Suite.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef QBS_PERSISTENCE
+#define QBS_PERSISTENCE
+
+#include "persistentobject.h"
+#include <logging/logger.h>
+
+#include <QDataStream>
+#include <QSharedPointer>
+#include <QString>
+#include <QVariantMap>
+#include <QVector>
+
+namespace qbs {
+namespace Internal {
+
+class PersistentPool
+{
+public:
+    PersistentPool(const Logger &logger);
+    ~PersistentPool();
+
+    class HeadData
+    {
+    public:
+        QVariantMap projectConfig;
+    };
+
+    void load(const QString &filePath);
+    void setupWriteStream(const QString &filePath);
+    void closeStream();
+    void clear();
+    QDataStream &stream();
+
+    template <typename T> T *idLoad();
+    template <typename T> void loadContainer(T &container);
+    template <class T> QSharedPointer<T> idLoadS();
+    template <typename T> void loadContainerS(T &container);
+
+    void store(const QSharedPointer<const PersistentObject> &ptr) { store(ptr.data()); }
+    void store(const PersistentObject *object);
+    template <typename T> void storeContainer(T &container);
+
+    void storeString(const QString &t);
+    QString loadString(int id);
+    QString idLoadString();
+
+    void storeStringSet(const QSet<QString> &t);
+    QSet<QString> loadStringSet(const QList<int> &id);
+    QSet<QString> idLoadStringSet();
+
+    void storeStringList(const QStringList &t);
+    QStringList loadStringList(const QList<int> &ids);
+    QStringList idLoadStringList();
+
+    const HeadData &headData() const { return m_headData; }
+    void setHeadData(const HeadData &hd) { m_headData = hd; }
+
+private:
+    typedef int PersistentObjectId;
+
+    template<typename T> struct RemovePointer { typedef T Type; };
+    template<typename T> struct RemovePointer<T*> { typedef T Type; };
+    template <class T> struct RemoveConst { typedef T Type; };
+    template <class T> struct RemoveConst<const T> { typedef T Type; };
+
+    template <class T> T *loadRaw(PersistentObjectId id);
+    template <class T> QSharedPointer<T> load(PersistentObjectId id);
+
+    QDataStream m_stream;
+    HeadData m_headData;
+    QVector<PersistentObject *> m_loadedRaw;
+    QVector<QSharedPointer<PersistentObject> > m_loaded;
+    QHash<const PersistentObject *, int> m_storageIndices;
+    PersistentObjectId m_lastStoredObjectId;
+
+    QVector<QString> m_stringStorage;
+    QHash<QString, int> m_inverseStringStorage;
+    PersistentObjectId m_lastStoredStringId;
+    Logger m_logger;
+};
+
+template <typename T> inline T *PersistentPool::idLoad()
+{
+    PersistentObjectId id;
+    stream() >> id;
+    return loadRaw<T>(id);
+}
+
+template <typename T> inline void PersistentPool::loadContainer(T &container)
+{
+    int count;
+    stream() >> count;
+    container.clear();
+    container.reserve(count);
+    for (int i = count; --i >= 0;)
+        container += idLoad<typename RemovePointer<typename T::value_type>::Type>();
+}
+
+template <class T> inline QSharedPointer<T> PersistentPool::idLoadS()
+{
+    PersistentObjectId id;
+    m_stream >> id;
+    return load<T>(id);
+}
+
+template <typename T> inline void PersistentPool::loadContainerS(T &container)
+{
+    int count;
+    stream() >> count;
+    container.clear();
+    container.reserve(count);
+    for (int i = count; --i >= 0;)
+        container += idLoadS<typename RemoveConst<typename T::value_type::value_type>::Type>();
+}
+
+template <typename T> inline void PersistentPool::storeContainer(T &container)
+{
+    stream() << container.count();
+    typename T::const_iterator it = container.constBegin();
+    const typename T::const_iterator itEnd = container.constEnd();
+    for (; it != itEnd; ++it)
+        store(*it);
+}
+
+template <class T> inline T *PersistentPool::loadRaw(PersistentObjectId id)
+{
+    if (id < 0)
+        return 0;
+
+    if (id < m_loadedRaw.count()) {
+        PersistentObject *obj = m_loadedRaw.value(id);
+        return dynamic_cast<T*>(obj);
+    }
+
+    int i = m_loadedRaw.count();
+    m_loadedRaw.resize(id + 1);
+    for (; i < m_loadedRaw.count(); ++i)
+        m_loadedRaw[i] = 0;
+
+    T * const t = new T;
+    PersistentObject * const po = t;
+    m_loadedRaw[id] = po;
+    po->load(*this);
+    return t;
+}
+
+template <class T> inline QSharedPointer<T> PersistentPool::load(PersistentObjectId id)
+{
+    if (id < 0)
+        return QSharedPointer<T>();
+
+    if (id < m_loaded.count()) {
+        QSharedPointer<PersistentObject> obj = m_loaded.value(id);
+        return obj.dynamicCast<T>();
+    }
+
+    m_loaded.resize(id + 1);
+    const QSharedPointer<T> t = T::create();
+    m_loaded[id] = t;
+    PersistentObject * const po = t.data();
+    po->load(*this);
+    return t;
+}
+
+} // namespace Internal
+} // namespace qbs
+
+#endif