LocalRef.hxx

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#pragma once
 
#if defined __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunknown-attributes"
#endif
#include <jni.h>
#if defined __clang__
#pragma clang diagnostic pop
#endif
 
namespace connectivity::jdbc
{
 
    template< typename T >
    class LocalRef final
    {
    public:
        explicit LocalRef( JNIEnv& environment )
            :m_environment( environment )
            ,m_object( nullptr )
        {
        }
 
        LocalRef( JNIEnv& environment, T object )
            :m_environment( environment )
            ,m_object( object )
        {
        }
 
        ~LocalRef()
        {
            reset();
        }
 
        T release()
        {
            T t = m_object;
            m_object = nullptr;
            return t;
        }
 
        void set( T object ) { reset(); m_object = object; }
 
        void reset()
        {
            if ( m_object != nullptr )
            {
                m_environment.DeleteLocalRef( m_object );
                m_object = nullptr;
            }
        }
 
        JNIEnv& env() const { return m_environment; }
        T       get() const { return m_object; }
        bool    is()  const { return m_object != nullptr; }
 
    private:
        LocalRef(LocalRef const &) = delete;
        LocalRef& operator =(LocalRef const &) = delete;
 
        JNIEnv& m_environment;
        T       m_object;
    };
 
 
} // namespace connectivity::jdbc
 
 
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