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       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             : #ifndef INCLUDED_COMPHELPER_WEAKBAG_HXX
      21             : #define INCLUDED_COMPHELPER_WEAKBAG_HXX
      22             : 
      23             : #include "sal/config.h"
      24             : 
      25             : #include <list>
      26             : #include "com/sun/star/uno/Reference.hxx"
      27             : #include "cppuhelper/weakref.hxx"
      28             : #include "osl/diagnose.h"
      29             : 
      30             : namespace comphelper {
      31             : 
      32             : /**
      33             :    A bag of UNO weak references.
      34             : */
      35          16 : template< typename T > class WeakBag {
      36             : public:
      37             :     /**
      38             :        Add a new weak reference.
      39             : 
      40             :        The implementation keeps the amount of memory consumed linear in the
      41             :        number of living references added, not linear in the number of total
      42             :        references added.
      43             : 
      44             :        @param e
      45             :        a non-null reference.
      46             :     */
      47           8 :     void add(com::sun::star::uno::Reference< T > const & e) {
      48             :         OSL_ASSERT(e.is());
      49          16 :         for (typename WeakReferenceList::iterator i(m_list.begin()); i != m_list.end();) {
      50           0 :             if (com::sun::star::uno::Reference< T >(*i).is()) {
      51           0 :                 ++i;
      52             :             } else {
      53           0 :                 i = m_list.erase(i);
      54             :             }
      55             :         }
      56           8 :         m_list.push_back(com::sun::star::uno::WeakReference< T >(e));
      57           8 :     }
      58             : 
      59             :     /**
      60             :        Remove a living reference.
      61             : 
      62             :        @return
      63             :        a living reference, or null if there are none.
      64             :     */
      65          16 :     com::sun::star::uno::Reference< T > remove() {
      66          32 :         while (!m_list.empty()) {
      67           8 :             com::sun::star::uno::Reference< T > r(m_list.front());
      68           8 :             m_list.pop_front();
      69           8 :             if (r.is()) {
      70           8 :                 return r;
      71             :             }
      72             :         }
      73           8 :         return com::sun::star::uno::Reference< T >();
      74             :     }
      75             : 
      76             : private:
      77             :     typedef std::list< com::sun::star::uno::WeakReference< T > > WeakReferenceList;
      78             : 
      79             :     WeakReferenceList m_list;
      80             : };
      81             : 
      82             : }
      83             : 
      84             : #endif
      85             : 
      86             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */