Line data    Source code

       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 CONNECTIVITY_LOCALREF_HXX
      21             : #define CONNECTIVITY_LOCALREF_HXX
      22             : 
      23             : #include <jvmaccess/virtualmachine.hxx>
      24             : 
      25             : 
      26             : namespace connectivity { namespace jdbc
      27             : {
      28             : 
      29             : 
      30             : 
      31             :     //= LocalRef
      32             : 
      33             :     /** helper class to hold a local ref to a JNI object
      34             : 
      35             :         Note that this class never actually calls NewLocalRef. It is assumed that all objects
      36             :         passed are already acquired with a local ref (as it usually is the case if you obtain
      37             :         the object from an JNI method).
      38             :     */
      39             :     template< typename T >
      40             :     class LocalRef
      41             :     {
      42             :     public:
      43           0 :         explicit LocalRef( JNIEnv& environment )
      44             :             :m_environment( environment )
      45           0 :             ,m_object( NULL )
      46             :         {
      47           0 :         }
      48             : 
      49           0 :         LocalRef( JNIEnv& environment, T object )
      50             :             :m_environment( environment )
      51           0 :             ,m_object( object )
      52             :         {
      53           0 :         }
      54             : 
      55           0 :         ~LocalRef()
      56             :         {
      57           0 :             reset();
      58           0 :         }
      59             : 
      60           0 :         T release()
      61             :         {
      62           0 :             T t = m_object;
      63           0 :             m_object = NULL;
      64           0 :             return t;
      65             :         }
      66             : 
      67           0 :         void set( T object ) { reset(); m_object = object; }
      68             : 
      69           0 :         void reset()
      70             :         {
      71           0 :             if ( m_object != NULL )
      72             :             {
      73           0 :                 m_environment.DeleteLocalRef( m_object );
      74           0 :                 m_object = NULL;
      75             :             }
      76           0 :         }
      77             : 
      78           0 :         JNIEnv& env() const { return m_environment; }
      79           0 :         T       get() const { return m_object; }
      80           0 :         bool    is()  const { return m_object != NULL; }
      81             : 
      82             :     private:
      83             :         LocalRef(LocalRef &); // not defined
      84             :         void operator =(LocalRef &); // not defined
      85             : 
      86             :     protected:
      87             :         JNIEnv& m_environment;
      88             :         T       m_object;
      89             :     };
      90             : 
      91             : 
      92             : } } // namespace connectivity::jdbc
      93             : 
      94             : 
      95             : #endif // CONNECTIVITY_LOCALREF_HXX
      96             : 
      97             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */