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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                 :        316 : 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                 :         96 :     void add(com::sun::star::uno::Reference< T > const & e) {
      48                 :            :         OSL_ASSERT(e.is());
      49         [ -  + ]:         96 :         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         [ +  - ]:         96 :         m_list.push_back(com::sun::star::uno::WeakReference< T >(e));
      57                 :         96 :     }
      58                 :            : 
      59                 :            :     /**
      60                 :            :        Remove a living reference.
      61                 :            : 
      62                 :            :        @return
      63                 :            :        a living reference, or null if there are none.
      64                 :            :     */
      65                 :        254 :     com::sun::star::uno::Reference< T > remove() {
      66         [ +  + ]:        254 :         while (!m_list.empty()) {
      67 [ +  - ][ +  - ]:         96 :             com::sun::star::uno::Reference< T > r(m_list.front());
      68         [ +  - ]:         96 :             m_list.pop_front();
      69         [ +  - ]:         96 :             if (r.is()) {
      70         [ -  + ]:         96 :                 return r;
      71                 :            :             }
      72                 :            :         }
      73                 :        254 :         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: */