connectivity/source/inc/java/GlobalRef.hxx

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  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 #include <jvmaccess/virtualmachine.hxx>
  27
  28
  29 namespace connectivity { namespace jdbc
  30 {
  31     /** helper class to hold a local ref to a JNI object
  32     */
  33     template< typename T >
  34     class GlobalRef
  35     {
  36     public:
  37         GlobalRef()
  38             :m_object( NULL )
  39         {
  40         }
  41
  42         GlobalRef( const GlobalRef& _source )
  43             :m_object( NULL )
  44         {
  45             *this = _source;
  46         }
  47
  48         GlobalRef& operator=( const GlobalRef& _source )
  49         {
  50             if ( &_source == this )
  51                 return *this;
  52
  53             SDBThreadAttach t;
  54             set( t.env(), _source.get() );
  55             return *this;
  56         }
  57
  58         ~GlobalRef()
  59         {
  60             reset();
  61         }
  62
  63         void reset()
  64         {
  65             if ( m_object != NULL )
  66             {
  67                 SDBThreadAttach t;
  68                 t.env().DeleteGlobalRef( m_object );
  69                 m_object = NULL;
  70             }
  71         }
  72
  73         void set( JNIEnv& _environment, T _object )
  74         {
  75             if ( m_object != NULL )
  76                 _environment.DeleteGlobalRef( m_object );
  77             m_object = _object;
  78             if ( m_object )
  79                 m_object = static_cast< T >( _environment.NewGlobalRef( m_object ) );
  80         }
  81
  82         void set( LocalRef< T >& _object )
  83         {
  84             set( _object.env(), _object.release() );
  85         }
  86
  87         T get() const
  88         {
  89             return m_object;
  90         }
  91
  92         bool is() const
  93         {
  94             return m_object != NULL;
  95         }
  96
  97     private:
  98         T   m_object;
  99     };
 100
 101
 102
 103 } } // namespace connectivity::jdbc
 104
 105
 106 #endif // INCLUDED_CONNECTIVITY_SOURCE_INC_JAVA_GLOBALREF_HXX
 107
 108 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */