connectivity/source/inc/java/GlobalRef.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #pragma once
  21
  22 #include <java/LocalRef.hxx>
  23 #include <java/lang/Object.hxx>
  24
  25
  26 namespace connectivity::jdbc
  27 {
  28     /** helper class to hold a local ref to a JNI object
  29     */
  30     template< typename T >
  31     class GlobalRef
  32     {
  33     public:
  34         GlobalRef()
  35             :m_object( nullptr )
  36         {
  37         }
  38
  39         GlobalRef( const GlobalRef& _source )
  40             :m_object( nullptr )
  41         {
  42             *this = _source;
  43         }
  44
  45         GlobalRef& operator=( const GlobalRef& _source )
  46         {
  47             if ( &_source == this )
  48                 return *this;
  49
  50             SDBThreadAttach t;
  51             set( t.env(), _source.get() );
  52             return *this;
  53         }
  54
  55         ~GlobalRef() COVERITY_NOEXCEPT_FALSE
  56         {
  57             reset();
  58         }
  59
  60         void reset()
  61         {
  62             if ( m_object != nullptr )
  63             {
  64                 SDBThreadAttach t;
  65                 t.env().DeleteGlobalRef( m_object );
  66                 m_object = nullptr;
  67             }
  68         }
  69
  70         void set( JNIEnv& _environment, T _object )
  71         {
  72             if ( m_object != nullptr )
  73                 _environment.DeleteGlobalRef( m_object );
  74             m_object = _object;
  75             if ( m_object )
  76                 m_object = static_cast< T >( _environment.NewGlobalRef( m_object ) );
  77         }
  78
  79         void set( LocalRef< T >& _object )
  80         {
  81             set( _object.env(), _object.release() );
  82         }
  83
  84         T get() const
  85         {
  86             return m_object;
  87         }
  88
  89         bool is() const
  90         {
  91             return m_object != nullptr;
  92         }
  93
  94     private:
  95         T   m_object;
  96     };
  97
  98
  99 } // namespace connectivity::jdbc
 100
 101
 102 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */