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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_SLIDESHOW_LISTENERCONTAINERIMPL_HXX
#define INCLUDED_SLIDESHOW_LISTENERCONTAINERIMPL_HXX
#include <sal/config.h>
#include <boost/weak_ptr.hpp>
namespace slideshow {
namespace internal {
////////////////////////////////////////////////////////////////////////////
struct EmptyBase
{
struct EmptyGuard{ explicit EmptyGuard(EmptyBase) {} };
struct EmptyClearableGuard
{
explicit EmptyClearableGuard(EmptyBase) {}
void clear() {}
void reset() {}
};
typedef EmptyGuard Guard;
typedef EmptyClearableGuard ClearableGuard;
};
class MutexBase
{
public:
struct Guard : public osl::MutexGuard
{
explicit Guard(MutexBase const& rBase) :
osl::MutexGuard(rBase.maMutex)
{}
};
struct ClearableGuard : public osl::ClearableMutexGuard
{
explicit ClearableGuard(MutexBase const& rBase) :
osl::ClearableMutexGuard(rBase.maMutex)
{}
};
mutable osl::Mutex maMutex;
};
////////////////////////////////////////////////////////////////////////////
template< typename result_type, typename ListenerTargetT > struct FunctionApply
{
template<typename FuncT> static bool apply(
FuncT func,
ListenerTargetT const& rArg )
{
return func(rArg);
}
};
template<typename ListenerTargetT> struct FunctionApply<void,ListenerTargetT>
{
template<typename FuncT> static bool apply(
FuncT func,
ListenerTargetT const& rArg )
{
func(rArg);
return true;
}
};
////////////////////////////////////////////////////////////////////////////
template< typename ListenerT > struct ListenerOperations
{
/// Notify a single one of the listeners
template< typename ContainerT,
typename FuncT >
static bool notifySingleListener( ContainerT& rContainer,
FuncT func )
{
const typename ContainerT::const_iterator aEnd( rContainer.end() );
// true: a handler in this queue processed the event
// false: no handler in this queue finally processed the event
return (std::find_if( rContainer.begin(),
aEnd,
func ) != aEnd);
}
/// Notify all listeners
template< typename ContainerT,
typename FuncT >
static bool notifyAllListeners( ContainerT& rContainer,
FuncT func )
{
bool bRet(false);
typename ContainerT::const_iterator aCurr( rContainer.begin() );
typename ContainerT::const_iterator const aEnd ( rContainer.end() );
while( aCurr != aEnd )
{
if( FunctionApply< typename FuncT::result_type,
typename ContainerT::value_type >::apply(
func,
*aCurr) )
{
bRet = true;
}
++aCurr;
}
// true: at least one handler returned true
// false: not a single handler returned true
return bRet;
}
/// Prune container from deceased listeners
template< typename ContainerT >
static void pruneListeners( ContainerT&, size_t )
{
}
};
// specializations for weak_ptr
// ----------------------------
template< typename ListenerTargetT >
struct ListenerOperations< boost::weak_ptr<ListenerTargetT> >
{
template< typename ContainerT,
typename FuncT >
static bool notifySingleListener( ContainerT& rContainer,
FuncT func )
{
typename ContainerT::const_iterator aCurr( rContainer.begin() );
typename ContainerT::const_iterator const aEnd ( rContainer.end() );
while( aCurr != aEnd )
{
boost::shared_ptr<ListenerTargetT> pListener( aCurr->lock() );
if( pListener && func(pListener) )
return true;
++aCurr;
}
return false;
}
template< typename ContainerT,
typename FuncT >
static bool notifyAllListeners( ContainerT& rContainer,
FuncT func )
{
bool bRet(false);
typename ContainerT::const_iterator aCurr( rContainer.begin() );
typename ContainerT::const_iterator const aEnd ( rContainer.end() );
while( aCurr != aEnd )
{
boost::shared_ptr<ListenerTargetT> pListener( aCurr->lock() );
if( pListener.get() &&
FunctionApply< typename FuncT::result_type,
boost::shared_ptr<ListenerTargetT> >::apply(func,pListener) )
{
bRet = true;
}
++aCurr;
}
return bRet;
}
template< typename ContainerT >
static void pruneListeners( ContainerT& rContainer,
size_t nSizeThreshold )
{
if( rContainer.size() <= nSizeThreshold )
return;
ContainerT aAliveListeners;
aAliveListeners.reserve(rContainer.size());
typename ContainerT::const_iterator aCurr( rContainer.begin() );
typename ContainerT::const_iterator const aEnd ( rContainer.end() );
while( aCurr != aEnd )
{
if( !aCurr->expired() )
aAliveListeners.push_back( *aCurr );
++aCurr;
}
std::swap( rContainer, aAliveListeners );
}
};
} // namespace internal
} // namespace Presentation
#endif /* INCLUDED_SLIDESHOW_LISTENERCONTAINERIMPL_HXX */
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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