/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifndef INCLUDED_CPPUHELPER_IMPLBASE_HXX
#define INCLUDED_CPPUHELPER_IMPLBASE_HXX

#include "sal/config.h"

#include <cstddef>
#include <utility>

#include "com/sun/star/lang/XTypeProvider.hpp"
#include "com/sun/star/uno/Any.h"
#include "com/sun/star/uno/Sequence.hxx"
#include "com/sun/star/uno/Type.h"
#include "cppuhelper/implbase_ex.hxx"
#include "cppuhelper/weak.hxx"
#include "rtl/instance.hxx"
#include "sal/types.h"

#if defined LIBO_INTERNAL_ONLY

// A replacement for ImplHelperN has deliberately been left out, as ImplHelperN
// is unlikely ever be a better choice than WeakImplHelper, so all their
// existing uses are probably confused and should use WeakImplHelper instead.
//
// Replacements for WeakAggImplHelperN and AggImplInheritanceHelperN have
// deliberately been left out, as the underlying aggregation mechanism is known
// broken in general and should not be used.

namespace cppu {

/// @cond INTERNAL

namespace detail {

template<std::size_t N> struct class_dataN {
    sal_Int16 m_nTypes;
    sal_Bool m_storedTypeRefs;
    sal_Bool m_storedId;
    sal_Int8 m_id[16];
    type_entry m_typeEntries[N + 1];
};

template<typename Impl, typename... Ifc> struct ImplClassData {
    class_data * operator ()() {
        static class_dataN<sizeof... (Ifc)> s_cd = {
            sizeof... (Ifc) + 1, false, false, {},
            {
                { { Ifc::static_type },
                  (reinterpret_cast<sal_IntPtr>(
                      static_cast<Ifc *>(reinterpret_cast<Impl *>(16)))
                   - 16)
                }...,
                CPPUHELPER_DETAIL_TYPEENTRY(css::lang::XTypeProvider)
            }
        };
        return reinterpret_cast<class_data *>(&s_cd);
    }
};

}

/// @endcond

/** Implementation helper implementing interfaces
    css::uno::XInterface, css::lang::XTypeProvider, and
    css::uno::XWeak (through cppu::OWeakObject).

    @derive
    Inherit from this class giving your interface(s) to be implemented as
    template argument(s).
*/
template<typename... Ifc>
class SAL_NO_VTABLE SAL_DLLPUBLIC_TEMPLATE WeakImplHelper:
    public OWeakObject, public css::lang::XTypeProvider, public Ifc...
{
    struct cd:
        rtl::StaticAggregate<
            class_data, detail::ImplClassData<WeakImplHelper, Ifc...>>
    {};

protected:
    WeakImplHelper() {}

    virtual ~WeakImplHelper() override {}

public:
    WeakImplHelper(WeakImplHelper const &) = default;
    WeakImplHelper(WeakImplHelper &&) = default;
    WeakImplHelper & operator =(WeakImplHelper const &) = default;
    WeakImplHelper & operator =(WeakImplHelper &&) = default;

    css::uno::Any SAL_CALL queryInterface(css::uno::Type const & aType) override
    { return WeakImplHelper_query(aType, cd::get(), this, this); }

    void SAL_CALL acquire() SAL_NOEXCEPT override { OWeakObject::acquire(); }

    void SAL_CALL release() SAL_NOEXCEPT override { OWeakObject::release(); }

    css::uno::Sequence<css::uno::Type> SAL_CALL getTypes() override
    { return WeakImplHelper_getTypes(cd::get()); }

    css::uno::Sequence<sal_Int8> SAL_CALL getImplementationId() override
    { return css::uno::Sequence<sal_Int8>(); }
};

/** Implementation helper implementing interfaces
    css::uno::XInterface and css::lang::XTypeProvider
    inheriting from a BaseClass.

    All acquire() and release() calls are delegated to the BaseClass.  Upon
    queryInterface(), if a demanded interface is not supported by this class
    directly, the request is delegated to the BaseClass.

    @attention
    The BaseClass has to be complete in the sense that
    css::uno::XInterface and css::lang::XTypeProvider are
    implemented properly.

    @derive
    Inherit from this class giving your additional interface(s) to be
    implemented as template argument(s).
*/
template<typename BaseClass, typename... Ifc>
class SAL_NO_VTABLE SAL_DLLPUBLIC_TEMPLATE ImplInheritanceHelper:
    public BaseClass, public Ifc...
{
    struct cd:
        rtl::StaticAggregate<
            class_data, detail::ImplClassData<ImplInheritanceHelper, Ifc...>>
    {};

protected:
    template<typename... Arg> ImplInheritanceHelper(Arg &&... arg):
        BaseClass(std::forward<Arg>(arg)...)
    {}

    virtual ~ImplInheritanceHelper() {}

public:
    ImplInheritanceHelper(ImplInheritanceHelper const &) = default;
    ImplInheritanceHelper(ImplInheritanceHelper &&) = default;
    ImplInheritanceHelper & operator =(ImplInheritanceHelper const &) = default;
    ImplInheritanceHelper & operator =(ImplInheritanceHelper &&) = default;

    css::uno::Any SAL_CALL queryInterface(css::uno::Type const & aType) override
    {
        css::uno::Any ret(ImplHelper_queryNoXInterface(aType, cd::get(), this));
        return ret.hasValue() ? ret : BaseClass::queryInterface(aType);
    }

    void SAL_CALL acquire() SAL_NOEXCEPT override { BaseClass::acquire(); }

    void SAL_CALL release() SAL_NOEXCEPT override { BaseClass::release(); }

    css::uno::Sequence<css::uno::Type> SAL_CALL getTypes() override
    { return ImplInhHelper_getTypes(cd::get(), BaseClass::getTypes()); }

    css::uno::Sequence<sal_Int8> SAL_CALL getImplementationId() override
    { return css::uno::Sequence<sal_Int8>(); }
};

}

#endif

#endif

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