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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_INTERFACECONTAINER2_H
#define INCLUDED_COMPHELPER_INTERFACECONTAINER2_H
#include <sal/config.h>
#include <vector>
#include <com/sun/star/lang/EventObject.hpp>
#include <com/sun/star/lang/DisposedException.hpp>
#include <comphelper/comphelperdllapi.h>
namespace com::sun::star::uno { class XInterface; }
namespace osl { class Mutex; }
namespace comphelper
{
namespace detail {
/**
This is here to optimise space in the common case that there are zero or one
listeners.
*/
union element_alias2
{
std::vector< css::uno::Reference< css::uno::XInterface > > *pAsVector;
css::uno::XInterface * pAsInterface;
element_alias2() : pAsInterface(nullptr) {}
};
}
class OInterfaceContainerHelper2;
/**
This is the iterator of an OInterfaceContainerHelper2. Typically
one constructs an instance on the stack for one firing session.
It is not allowed to assign or copy an instance of this class.
@see OInterfaceContainerHelper2
*/
class COMPHELPER_DLLPUBLIC OInterfaceIteratorHelper2
{
public:
/**
Create an iterator over the elements of the container. The iterator
copies the elements of the container. A change to the container
during the lifetime of an iterator is allowed and does not
affect the iterator-instance. The iterator and the container take cares
themself for concurrent access, no additional guarding is necessary.
Remark: The copy is on demand. The iterator copy the elements only if the container
change the contents. It is not allowed to destroy the container as long
as an iterator exist.
@param rCont the container of the elements.
*/
OInterfaceIteratorHelper2( OInterfaceContainerHelper2 & rCont );
/**
Releases the connection to the container.
*/
~OInterfaceIteratorHelper2();
/** Return true, if there are more elements in the iterator. */
bool hasMoreElements() const
{ return nRemain != 0; }
/** Return the next element of the iterator. Calling this method if
hasMoreElements() has returned false, is an error. Cast the
returned pointer to the
*/
css::uno::XInterface * next();
/** Removes the current element (the last one returned by next())
from the underlying container. Calling this method before
next() has been called or calling it twice with no next()
inbetween is an error.
*/
void remove();
private:
OInterfaceContainerHelper2 & rCont;
detail::element_alias2 aData;
sal_Int32 nRemain;
bool bIsList;
OInterfaceIteratorHelper2( const OInterfaceIteratorHelper2 & ) = delete;
OInterfaceIteratorHelper2 & operator = ( const OInterfaceIteratorHelper2 & ) = delete;
};
/**
A container of interfaces. To access the elements use an iterator.
This implementation is thread-safe.
This is a copy of the code at include/cppuhelper/interfacecontainer.h,
Except that it uses a std::vector instead of a Sequence for the mutable listener
list, which provides far better performance.
@see OInterfaceIteratorHelper2
*/
class COMPHELPER_DLLPUBLIC OInterfaceContainerHelper2
{
public:
/**
Create an interface container.
@param rMutex the mutex to protect multi thread access.
The lifetime must be longer than the lifetime
of this object.
*/
OInterfaceContainerHelper2( ::osl::Mutex & rMutex );
/**
Release all interfaces. All iterators must be destroyed before
the container is destructed.
*/
~OInterfaceContainerHelper2();
/**
Return the number of Elements in the container. Only useful if you have acquired
the mutex.
*/
sal_Int32 getLength() const;
/**
Return all interfaces added to this container.
**/
std::vector< css::uno::Reference< css::uno::XInterface > > getElements() const;
/** Inserts an element into the container. The position is not specified, thus it is not
specified in which order events are fired.
@attention
If you add the same interface more than once, then it will be added to the elements list
more than once and thus if you want to remove that interface from the list, you have to call
removeInterface() the same number of times.
In the latter case, you will also get events fired more than once (if the interface is a
listener interface).
@param rxIFace
interface to be added; it is allowed to insert null or
the same interface more than once
@return
the new count of elements in the container
*/
sal_Int32 addInterface( const css::uno::Reference< css::uno::XInterface > & rxIFace );
/** Removes an element from the container. It uses interface equality to remove the interface.
@param rxIFace
interface to be removed
@return
the new count of elements in the container
*/
sal_Int32 removeInterface( const css::uno::Reference< css::uno::XInterface > & rxIFace );
/** Return an interface by index */
css::uno::Reference< css::uno::XInterface > getInterface(sal_Int32 nIndex) const;
/**
Call disposing on all object in the container that
support XEventListener. Then clear the container.
*/
void disposeAndClear( const css::lang::EventObject & rEvt );
/**
Clears the container without calling disposing().
*/
void clear();
/** Executes a functor for each contained listener of specified type, e.g.
<code>forEach<awt::XPaintListener>(...</code>.
If a css::lang::DisposedException occurs which relates to
the called listener, then that listener is removed from the container.
@tparam ListenerT listener type
@tparam FuncT unary functor type, let your compiler deduce this for you
@param func unary functor object expecting an argument of type
css::uno::Reference<ListenerT>
*/
template <typename ListenerT, typename FuncT>
inline void forEach( FuncT const& func );
/** Calls a UNO listener method for each contained listener.
The listener method must take a single argument of type EventT,
and return <code>void</code>.
If a css::lang::DisposedException occurs which relates to
the called listener, then that listener is removed from the container.
@tparam ListenerT UNO event listener type, let your compiler deduce this for you
@tparam EventT event type, let your compiler deduce this for you
@param NotificationMethod
Pointer to a method of a ListenerT interface.
@param Event
Event to notify to all contained listeners
Example:
@code
awt::PaintEvent aEvent( static_cast< cppu::OWeakObject* >( this ), ... );
listeners.notifyEach( &XPaintListener::windowPaint, aEvent );
@endcode
*/
template< typename ListenerT, typename EventT >
inline void notifyEach( void ( SAL_CALL ListenerT::*NotificationMethod )( const EventT& ), const EventT& Event );
private:
friend class OInterfaceIteratorHelper2;
/**
bIsList == TRUE -> aData.pAsVector of type vector< XInterfaceSequence >,
otherwise aData.pAsInterface == of type (XEventListener *)
*/
detail::element_alias2 aData;
::osl::Mutex & rMutex;
/** TRUE -> used by an iterator. */
bool bInUse;
/** TRUE -> aData.pAsVector is of type Sequence< XInterfaceSequence >. */
bool bIsList;
OInterfaceContainerHelper2( const OInterfaceContainerHelper2 & ) = delete;
OInterfaceContainerHelper2 & operator = ( const OInterfaceContainerHelper2 & ) = delete;
/*
Duplicate content of the container and release the old one without destroying.
The mutex must be locked and the memberbInUse must be true.
*/
void copyAndResetInUse();
private:
template< typename ListenerT, typename EventT >
class NotifySingleListener
{
private:
typedef void ( SAL_CALL ListenerT::*NotificationMethod )( const EventT& );
NotificationMethod const m_pMethod;
const EventT& m_rEvent;
public:
NotifySingleListener( NotificationMethod method, const EventT& event ) : m_pMethod( method ), m_rEvent( event ) { }
void operator()( const css::uno::Reference<ListenerT>& listener ) const
{
(listener.get()->*m_pMethod)( m_rEvent );
}
};
};
template <typename ListenerT, typename FuncT>
inline void OInterfaceContainerHelper2::forEach( FuncT const& func )
{
OInterfaceIteratorHelper2 iter( *this );
while (iter.hasMoreElements()) {
css::uno::Reference<ListenerT> const xListener( iter.next(), css::uno::UNO_QUERY );
if (xListener.is()) {
try {
func( xListener );
}
catch (css::lang::DisposedException const& exc) {
if (exc.Context == xListener)
iter.remove();
}
}
}
}
template< typename ListenerT, typename EventT >
inline void OInterfaceContainerHelper2::notifyEach( void ( SAL_CALL ListenerT::*NotificationMethod )( const EventT& ), const EventT& Event )
{
forEach< ListenerT, NotifySingleListener< ListenerT, EventT > >( NotifySingleListener< ListenerT, EventT >( NotificationMethod, Event ) );
}
}
#endif
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