connectivity/source/inc/java/GlobalRef.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.
   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_CONNECTIVITY_SOURCE_INC_JAVA_GLOBALREF_HXX
  21 #define INCLUDED_CONNECTIVITY_SOURCE_INC_JAVA_GLOBALREF_HXX
  22
  23 #include <java/LocalRef.hxx>
  24 #include <java/lang/Object.hxx>
  25
  26
  27 namespace connectivity::jdbc
  28 {
  29     /** helper class to hold a local ref to a JNI object
  30     */
  31     template< typename T >
  32     class GlobalRef
  33     {
  34     public:
  35         GlobalRef()
  36             :m_object( nullptr )
  37         {
  38         }
  39
  40         GlobalRef( const GlobalRef& _source )
  41             :m_object( nullptr )
  42         {
  43             *this = _source;
  44         }
  45
  46         GlobalRef& operator=( const GlobalRef& _source )
  47         {
  48             if ( &_source == this )
  49                 return *this;
  50
  51             SDBThreadAttach t;
  52             set( t.env(), _source.get() );
  53             return *this;
  54         }
  55
  56         ~GlobalRef() COVERITY_NOEXCEPT_FALSE
  57         {
  58             reset();
  59         }
  60
  61         void reset()
  62         {
  63             if ( m_object != nullptr )
  64             {
  65                 SDBThreadAttach t;
  66                 t.env().DeleteGlobalRef( m_object );
  67                 m_object = nullptr;
  68             }
  69         }
  70
  71         void set( JNIEnv& _environment, T _object )
  72         {
  73             if ( m_object != nullptr )
  74                 _environment.DeleteGlobalRef( m_object );
  75             m_object = _object;
  76             if ( m_object )
  77                 m_object = static_cast< T >( _environment.NewGlobalRef( m_object ) );
  78         }
  79
  80         void set( LocalRef< T >& _object )
  81         {
  82             set( _object.env(), _object.release() );
  83         }
  84
  85         T get() const
  86         {
  87             return m_object;
  88         }
  89
  90         bool is() const
  91         {
  92             return m_object != nullptr;
  93         }
  94
  95     private:
  96         T   m_object;
  97     };
  98
  99
 100 } // namespace connectivity::jdbc
 101
 102
 103 #endif // INCLUDED_CONNECTIVITY_SOURCE_INC_JAVA_GLOBALREF_HXX
 104
 105 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */