/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** accordance with the commercial license agreement provided with the
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
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** included in the packaging of this file. Please review the following
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****************************************************************************/

#ifndef QQMLPROPERTYINDEX_P_H
#define QQMLPROPERTYINDEX_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <private/qglobal_p.h>

QT_BEGIN_NAMESPACE

class QQmlPropertyIndex
{
    qint32 index;

public:
    QQmlPropertyIndex()
    { index = -1; }

    static QQmlPropertyIndex fromEncoded(qint32 encodedIndex)
    {
        QQmlPropertyIndex idx;
        idx.index = encodedIndex;
        return idx;
    }

    explicit QQmlPropertyIndex(int coreIndex)
    { index = encode(coreIndex, -1); }

    explicit QQmlPropertyIndex(int coreIndex, int valueTypeIndex)
        : index(encode(coreIndex, valueTypeIndex))
    {}

    bool isValid() const
    { return index != -1; }

    int coreIndex() const
    {
        if (index == -1)
            return -1;
        return index & 0xffff;
    }

    int valueTypeIndex() const
    {
        if (index == -1)
            return -1;
        return (index >> 16) - 1;
    }

    bool hasValueTypeIndex() const
    {
        if (index == -1)
            return false;
        return index >> 16;
    }

    qint32 toEncoded() const
    { return index; }

    int intValue() const
    { return index; }

    bool operator==(const QQmlPropertyIndex &other) const
    { return index == other.index; }

    bool operator!=(const QQmlPropertyIndex &other) const
    { return !operator==(other); }

private:
    static qint32 encode(int coreIndex, int valueTypeIndex)
    {
        Q_ASSERT(coreIndex >= -1);
        Q_ASSERT(coreIndex <= 0xffff);
        Q_ASSERT(valueTypeIndex >= -1);
        Q_ASSERT(valueTypeIndex < 0xffff);

        if (coreIndex == -1)
            return -1;
        else
            return coreIndex | ((valueTypeIndex + 1) << 16);
    }
};

QT_END_NAMESPACE

#endif // QQMLPROPERTYINDEX_P_H