include/svtools/templatefoldercache.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   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
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  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 <config_options.h>
  23 #include <svtools/svtdllapi.h>
  24 #include <o3tl/deleter.hxx>
  25 #include <memory>
  26
  27 namespace svt
  28 {
  29
  30
  31     //= TemplateFolderCache
  32
  33     class TemplateFolderCacheImpl;
  34     /** allows to cache the state of the template directories of OOo
  35         <p>Usually, this class is used together with an instance of the
  36         <service scope="com.sun.star.frame">DocumentTemplates</service> service. It allows to scan the template folders
  37         of the Office, and updates the configuration so that it reflects the most recent state of the folders.<br/>
  38         As this is an expensive, the TemplateFolderCache has been introduced. It caches the state of the template
  39         folders, and allows to determine if the DocumentTemplates service needs to be invoked to do the (much more expensive)
  40         update.</p>
  41     @example C++
  42     <listing>
  43         TemplateFolderCache aTemplateFolders;
  44         if ( aTemplateFolders.needsUpdate() )
  45         {
  46             // store the current state
  47             aCache.storeState();
  48
  49             // create the DocumentTemplates instance
  50             Reference< XDocumentTemplates > xTemplates = ...;
  51
  52             // update the templates configuration
  53             xTemplates->update();
  54         }
  55
  56         // do anything which relies on a up-to-date template configuration
  57     </listing>
  58     */
  59     class UNLESS_MERGELIBS(SVT_DLLPUBLIC) TemplateFolderCache
  60     {
  61     private:
  62         std::unique_ptr<TemplateFolderCacheImpl, o3tl::default_delete<TemplateFolderCacheImpl>> m_pImpl;
  63
  64     public:
  65         /** ctor.
  66         @param _bAutoStoreState
  67             Set this to <TRUE/> if you want the instance to automatically store the state of the template folders upon
  68             destruction.<br/>
  69             If set to <FALSE/>, you would explicitly need to call <method>storeState</method> to do this.<br/>
  70             If the current state is not known (e.g. because you did not call needsUpdate, which retrieves it),
  71             it is not retrieved in the dtor, regardless of the <arg>_bAutoStoreState</arg> flag.
  72         */
  73         TemplateFolderCache( bool _bAutoStoreState = false );
  74         ~TemplateFolderCache( );
  75
  76         /** determines whether or not the template configuration needs to be updated
  77         @return
  78             <TRUE/> if the template configuration needs to be updated
  79         */
  80         bool    needsUpdate();
  81
  82         /** stores the current state of the template folders in the cache  */
  83         void        storeState();
  84     };
  85
  86
  87 }   // namespace svt
  88
  89 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */