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Diffstat (limited to 'include/comphelper/interfacecontainer2.hxx')
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diff --git a/include/comphelper/interfacecontainer2.hxx b/include/comphelper/interfacecontainer2.hxx new file mode 100644 index 0000000000..3df7c71d49 --- /dev/null +++ b/include/comphelper/interfacecontainer2.hxx @@ -0,0 +1,290 @@ +/* -*- 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 + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |