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 INCLUDED_CONNECTIVITY_SOURCE_INC_JAVA_LOCALREF_HXX
      21             : #define INCLUDED_CONNECTIVITY_SOURCE_INC_JAVA_LOCALREF_HXX
      22             : 
      23             : #include <jvmaccess/virtualmachine.hxx>
      24             : 
      25             : 
      26             : namespace connectivity { namespace jdbc
      27             : {
      28             : 
      29             :     /** helper class to hold a local ref to a JNI object
      30             : 
      31             :         Note that this class never actually calls NewLocalRef. It is assumed that all objects
      32             :         passed are already acquired with a local ref (as it usually is the case if you obtain
      33             :         the object from an JNI method).
      34             :     */
      35             :     template< typename T >
      36             :     class LocalRef
      37             :     {
      38             :     public:
      39         790 :         explicit LocalRef( JNIEnv& environment )
      40             :             :m_environment( environment )
      41         790 :             ,m_object( NULL )
      42             :         {
      43         790 :         }
      44             : 
      45        1586 :         LocalRef( JNIEnv& environment, T object )
      46             :             :m_environment( environment )
      47        1586 :             ,m_object( object )
      48             :         {
      49        1586 :         }
      50             : 
      51        2376 :         ~LocalRef()
      52             :         {
      53        2376 :             reset();
      54        2376 :         }
      55             : 
      56         293 :         T release()
      57             :         {
      58         293 :             T t = m_object;
      59         293 :             m_object = NULL;
      60         293 :             return t;
      61             :         }
      62             : 
      63         790 :         void set( T object ) { reset(); m_object = object; }
      64             : 
      65        3166 :         void reset()
      66             :         {
      67        3166 :             if ( m_object != NULL )
      68             :             {
      69        1360 :                 m_environment.DeleteLocalRef( m_object );
      70        1360 :                 m_object = NULL;
      71             :             }
      72        3166 :         }
      73             : 
      74         257 :         JNIEnv& env() const { return m_environment; }
      75        2808 :         T       get() const { return m_object; }
      76        1503 :         bool    is()  const { return m_object != NULL; }
      77             : 
      78             :     private:
      79             :         LocalRef(LocalRef &) SAL_DELETED_FUNCTION;
      80             :         void operator =(LocalRef &) SAL_DELETED_FUNCTION;
      81             : 
      82             :     protected:
      83             :         JNIEnv& m_environment;
      84             :         T       m_object;
      85             :     };
      86             : 
      87             : 
      88             : } } // namespace connectivity::jdbc
      89             : 
      90             : 
      91             : #endif // INCLUDED_CONNECTIVITY_SOURCE_INC_JAVA_LOCALREF_HXX
      92             : 
      93             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */