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/* -*- 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_COMPHELPER_SERVICEHELPER_HXX
#define INCLUDED_COMPHELPER_SERVICEHELPER_HXX
#include <rtl/uuid.h>
#include <com/sun/star/lang/XUnoTunnel.hpp>
#include <com/sun/star/uno/Sequence.hxx>
namespace comphelper {
// Class incapsulating UIDs used as e.g. tunnel IDs for css::lang::XUnoTunnel,
// or implementation IDs for css::lang::XTypeProvider
class UnoIdInit
{
private:
css::uno::Sequence< sal_Int8 > m_aSeq;
public:
UnoIdInit() : m_aSeq(16)
{
rtl_createUuid(reinterpret_cast<sal_uInt8*>(m_aSeq.getArray()), nullptr, true);
}
const css::uno::Sequence< sal_Int8 >& getSeq() const { return m_aSeq; }
};
inline sal_Int64 getSomething_cast(void* p)
{
return sal::static_int_cast<sal_Int64>(reinterpret_cast<sal_IntPtr>(p));
}
template<class T> inline T* getSomething_cast(sal_Int64 n)
{
return reinterpret_cast<T*>(sal::static_int_cast<sal_IntPtr>(n));
}
template <class T> T* getFromUnoTunnel(const css::uno::Reference<css::lang::XUnoTunnel>& xUT)
{
if (!xUT.is())
return nullptr;
return getSomething_cast<T>(xUT->getSomething(T::getUnoTunnelId()));
}
// Takes an interface
template <class T> T* getFromUnoTunnel(const css::uno::Reference<css::uno::XInterface>& xIface)
{
return getFromUnoTunnel<T>(
css::uno::Reference<css::lang::XUnoTunnel>{ xIface, css::uno::UNO_QUERY });
}
// Takes an Any
template <class T> T* getFromUnoTunnel(const css::uno::Any& rAny)
{
// For unclear reason, using a Reference ctor taking an Any
// gives different results compared to use of operator >>=.
css::uno::Reference<css::lang::XUnoTunnel> xUnoTunnel;
rAny >>= xUnoTunnel;
return getFromUnoTunnel<T>(xUnoTunnel);
}
template <typename T>
inline bool isUnoTunnelId(const css::uno::Sequence< sal_Int8 >& rId)
{
return rId.getLength() == 16
&& memcmp(T::getUnoTunnelId().getConstArray(), rId.getConstArray(), 16) == 0;
}
template<typename T> struct MixinToGetSomethingOf {
static bool get(css::uno::Sequence<sal_Int8> const & id, T * p, sal_Int64 * result) {
if (!isUnoTunnelId<T>(id)) {
return false;
}
*result = getSomething_cast(p);
return true;
}
};
template <class Base> struct FallbackToGetSomethingOf
{
static sal_Int64 get(const css::uno::Sequence<sal_Int8>& rId, Base* p)
{
return p->Base::getSomething(rId);
}
};
template <> struct FallbackToGetSomethingOf<void>
{
static sal_Int64 get(const css::uno::Sequence<sal_Int8>&, void*) { return 0; }
};
// There are five cases how to implement T::getSomething:
// (1) Delegate to Base:
// Either, if Base has only getUnoTunnelId but no getSomething:
// return getSomethingImpl<Base>(aIdentifier, this);
// Or, if Base has getSomething:
// return Base::getSomething(aIdentifier)
// (2) Check against T::getUnoTunnelId, else return 0:
// return getSomethingImpl(aIdentifier, this);
// (3) Check against T::getUnoTunnelId, else delegate to Base:
// return getSomethingImpl(aIdentifier, this, FallbackToGetSomethingOf<Base>{});
// (4) Check against T::getUnoTunnelId, else check against each Mixins::getUnoTunnelId, else
// delegate to Base:
// return getSomethingImpl(
// aIdentifier, this, MixinToGetSomethingOf<Mixin1>{}, ...,
// MixinToGetSomethingOf<MixinN>{}, FallbackToGetSomethingOf<Base>{});
// (5) Check against each Mixins::getUnoTunnelId, else delegate to Base:
// return getSomethingImpl_skipDerived(
// aIdentifier, this, MixinToGetSomethingOf<Mixin1>{}, ...,
// MixinToGetSomethingOf<MixinN>{}, FallbackToGetSomethingOf<Base>{});
template <class T, class Base = void>
sal_Int64 getSomethingImpl(const css::uno::Sequence<sal_Int8>& rId, T* pThis,
FallbackToGetSomethingOf<Base> = {})
{
sal_Int64 res;
if (MixinToGetSomethingOf<T>::get(rId, pThis, &res)) {
return res;
}
return FallbackToGetSomethingOf<Base>::get(rId, pThis);
}
template <class T, class Mixin, class... Mixins, class Base>
sal_Int64 getSomethingImpl(const css::uno::Sequence<sal_Int8>& rId, T* pThis,
MixinToGetSomethingOf<Mixin>, MixinToGetSomethingOf<Mixins>...,
FallbackToGetSomethingOf<Base>)
{
sal_Int64 res;
if (((MixinToGetSomethingOf<T>::get(rId, pThis, &res)
|| MixinToGetSomethingOf<Mixin>::get(rId, pThis, &res)) || ...
|| MixinToGetSomethingOf<Mixins>::get(rId, pThis, &res)))
{
return res;
}
return FallbackToGetSomethingOf<Base>::get(rId, pThis);
}
template <class T, class Mixin, class... Mixins, class Base>
sal_Int64 getSomethingImpl_skipDerived(const css::uno::Sequence<sal_Int8>& rId, T* pThis,
MixinToGetSomethingOf<Mixin>, MixinToGetSomethingOf<Mixins>...,
FallbackToGetSomethingOf<Base>)
{
sal_Int64 res;
if ((MixinToGetSomethingOf<Mixin>::get(rId, pThis, &res) || ...
|| MixinToGetSomethingOf<Mixins>::get(rId, pThis, &res)))
{
return res;
}
return FallbackToGetSomethingOf<Base>::get(rId, pThis);
}
}
/** the UNO3_GETIMPLEMENTATION_* macros implement a static helper function
that gives access to your implementation for a given interface reference,
if possible.
Example:
MyClass* pClass = comphelper::getFromUnoTunnel<MyClass>( xRef );
Usage:
Put a UNO3_GETIMPLEMENTATION_DECL( classname ) inside your class
definition and UNO3_GETIMPLEMENTATION_IMPL( classname ) inside
your cxx file. Your class must inherit css::lang::XUnoTunnel
and export it with queryInterface. Implementation of XUnoTunnel is
done by this macro.
*/
#define UNO3_GETIMPLEMENTATION_DECL( classname ) \
static const css::uno::Sequence< sal_Int8 > & getUnoTunnelId() noexcept; \
virtual sal_Int64 SAL_CALL getSomething( const css::uno::Sequence< sal_Int8 >& aIdentifier ) override;
#define UNO3_GETIMPLEMENTATION_BASE_IMPL( classname ) \
const css::uno::Sequence< sal_Int8 > & classname::getUnoTunnelId() noexcept \
{ \
static const comphelper::UnoIdInit aId; \
return aId.getSeq(); \
}
#define UNO3_GETIMPLEMENTATION_IMPL( classname )\
UNO3_GETIMPLEMENTATION_BASE_IMPL(classname)\
sal_Int64 SAL_CALL classname::getSomething( const css::uno::Sequence< sal_Int8 >& rId ) \
{ \
return comphelper::getSomethingImpl(rId, this); \
}
#define UNO3_GETIMPLEMENTATION2_IMPL( classname, baseclass )\
UNO3_GETIMPLEMENTATION_BASE_IMPL(classname)\
sal_Int64 SAL_CALL classname::getSomething( const css::uno::Sequence< sal_Int8 >& rId ) \
{ \
return comphelper::getSomethingImpl(rId, this, comphelper::FallbackToGetSomethingOf<baseclass>{}); \
}
#endif // INCLUDED_COMPHELPER_SERVICEHELPER_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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