connectivity/source/drivers/firebird/SubComponent.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
   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 #pragma once
  21
  22 #include <cppuhelper/propshlp.hxx>
  23 #include <osl/diagnose.h>
  24 #include <osl/mutex.hxx>
  25
  26 namespace cppu { class IPropertyArrayHelper; }
  27 namespace com::sun::star::lang { class XComponent; }
  28
  29 namespace connectivity::firebird
  30     {
  31         /// @throws css::lang::DisposedException
  32         void checkDisposed(bool _bThrow);
  33
  34
  35         template <class TYPE>
  36         class OPropertyArrayUsageHelper
  37         {
  38         protected:
  39             static sal_Int32                        s_nRefCount;
  40             static ::cppu::IPropertyArrayHelper*    s_pProps;
  41             static ::osl::Mutex                     s_aMutex;
  42
  43         public:
  44             OPropertyArrayUsageHelper();
  45             virtual ~OPropertyArrayUsageHelper();
  46
  47             /** call this in the getInfoHelper method of your derived class. The method returns the array helper of the
  48                 class, which is created if necessary.
  49             */
  50             ::cppu::IPropertyArrayHelper*   getArrayHelper();
  51
  52         protected:
  53             /** used to implement the creation of the array helper which is shared amongst all instances of the class.
  54                 This method needs to be implemented in derived classes.
  55                 <BR>
  56                 The method gets called with s_aMutex acquired.
  57                 @return                         a pointer to the newly created array helper. Must not be NULL.
  58             */
  59             virtual ::cppu::IPropertyArrayHelper* createArrayHelper( ) const = 0;
  60         };
  61
  62         template<class TYPE>
  63         sal_Int32                       OPropertyArrayUsageHelper< TYPE >::s_nRefCount  = 0;
  64
  65         template<class TYPE>
  66         ::cppu::IPropertyArrayHelper*   OPropertyArrayUsageHelper< TYPE >::s_pProps = nullptr;
  67
  68         template<class TYPE>
  69         ::osl::Mutex                    OPropertyArrayUsageHelper< TYPE >::s_aMutex;
  70
  71
  72         template <class TYPE>
  73         OPropertyArrayUsageHelper<TYPE>::OPropertyArrayUsageHelper()
  74         {
  75             ::osl::MutexGuard aGuard(s_aMutex);
  76             ++s_nRefCount;
  77         }
  78
  79
  80         template <class TYPE>
  81         OPropertyArrayUsageHelper<TYPE>::~OPropertyArrayUsageHelper()
  82         {
  83             ::osl::MutexGuard aGuard(s_aMutex);
  84             OSL_ENSURE(s_nRefCount > 0, "OPropertyArrayUsageHelper::~OPropertyArrayUsageHelper : suspicious call : have a refcount of 0 !");
  85             if (!--s_nRefCount)
  86             {
  87                 delete s_pProps;
  88                 s_pProps = nullptr;
  89             }
  90         }
  91
  92
  93         template <class TYPE>
  94         ::cppu::IPropertyArrayHelper* OPropertyArrayUsageHelper<TYPE>::getArrayHelper()
  95         {
  96             OSL_ENSURE(s_nRefCount, "OPropertyArrayUsageHelper::getArrayHelper : suspicious call : have a refcount of 0 !");
  97             if (!s_pProps)
  98             {
  99                 ::osl::MutexGuard aGuard(s_aMutex);
 100                 if (!s_pProps)
 101                 {
 102                     s_pProps = createArrayHelper();
 103                     OSL_ENSURE(s_pProps, "OPropertyArrayUsageHelper::getArrayHelper : createArrayHelper returned nonsense !");
 104                 }
 105             }
 106             return s_pProps;
 107         }
 108
 109 }
 110
 111 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */