comphelper/source/misc/weakeventlistener.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <comphelper/weakeventlistener.hxx>
  21 #include <osl/diagnose.h>
  22
  23
  24 namespace comphelper
  25 {
  26
  27
  28     using namespace ::com::sun::star::uno;
  29     using namespace ::com::sun::star::lang;
  30
  31     OWeakListenerAdapterBase::~OWeakListenerAdapterBase()
  32     {
  33     }
  34
  35     OWeakEventListenerAdapter::OWeakEventListenerAdapter( Reference< XWeak > const & _rxListener, Reference< XComponent > const & _rxBroadcaster )
  36         :OWeakEventListenerAdapter_Base( _rxListener, _rxBroadcaster )
  37     {
  38         // add ourself as listener to the broadcaster
  39         OSL_ENSURE( _rxBroadcaster.is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid broadcaster!" );
  40         if ( _rxBroadcaster.is() )
  41         {
  42             osl_atomic_increment( &m_refCount );
  43             {
  44                 _rxBroadcaster->addEventListener( this );
  45             }
  46             osl_atomic_decrement( &m_refCount );
  47             OSL_ENSURE( m_refCount > 0, "OWeakEventListenerAdapter::OWeakEventListenerAdapter: oops - not to be used with implementations which hold their listeners weak!" );
  48                 // the one and only reason for this adapter class (A) is to add as listener to a component (C) which
  49                 // holds its listeners hard, and forward all calls then to another listener (L) which is
  50                 // held weak by A.
  51                 // Now if C holds listeners weak, then we do not need A, we can add L directly to C.
  52         }
  53
  54         OSL_ENSURE( getListener().is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid listener (does not support the XEventListener interface)!" );
  55     }
  56
  57
  58     void OWeakEventListenerAdapter::disposing( std::unique_lock<std::mutex>& /*rGuard*/ )
  59     {
  60         Reference< XComponent > xBroadcaster( getBroadcaster( ), UNO_QUERY );
  61         OSL_ENSURE( xBroadcaster.is(), "OWeakEventListenerAdapter::disposing: broadcaster is invalid in the meantime! How this?" );
  62         if ( xBroadcaster.is() )
  63         {
  64             xBroadcaster->removeEventListener( this );
  65         }
  66
  67         resetListener();
  68     }
  69
  70
  71 }   // namespace comphelper
  72
  73
  74 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */