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diff --git a/src/libs/installer/calculatorbase.h b/src/libs/installer/calculatorbase.h
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+/**************************************************************************
+**
+** Copyright (C) 2023 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Installer Framework.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+**************************************************************************/
+
+#ifndef CALCULATORBASE_H
+#define CALCULATORBASE_H
+
+#include "installer_global.h"
+
+#include <QList>
+#include <QString>
+#include <QMetaEnum>
+
+namespace QInstaller {
+
+class Component;
+class PackageManagerCore;
+
+class INSTALLER_EXPORT CalculatorBase
+{
+public:
+    enum class Resolution {
+        Selected = 0,     // "Selected Component(s) without Dependencies" / "Deselected Component(s)"
+        Replaced,         // "Component(s) replaced by other components"
+        VirtualDependent, // "No dependencies to virtual component"
+        Dependent,        // "Added as dependency for %1." / "Removed as dependency component is removed"
+        Automatic,        // "Component(s) added as automatic dependencies" / "Removed as autodependency component is removed"
+        Resolved,         // "Component(s) that have resolved Dependencies"
+        Alias             // "Components added from selected alias"
+    };
+
+    CalculatorBase(PackageManagerCore *core);
+    virtual ~CalculatorBase() = 0;
+
+    virtual bool solve(const QList<Component *> &components) = 0;
+    void insertResolution(Component *component, const Resolution resolutionType,
+                          const QString &referencedComponent = QString());
+
+    QList<Component *> resolvedComponents() const;
+    virtual QString resolutionText(Component *component) const = 0;
+    Resolution resolutionType(Component *component) const;
+
+    QString error() const;
+
+protected:
+    virtual bool solveComponent(Component *component, const QString &version = QString()) = 0;
+    QString referencedComponent(Component *component) const;
+
+protected:
+    PackageManagerCore *m_core;
+    QString m_errorString;
+
+    QList<Component *> m_resolvedComponents;
+    QHash<QString, QPair<Resolution, QString> > m_componentNameResolutionHash;
+};
+
+} // namespace QInstaller
+
+Q_DECLARE_METATYPE(QInstaller::CalculatorBase::Resolution)
+
+#endif // CALCULATORBASE_H