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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#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
{
/** helper class to hold a local ref to a JNI object
Note that this class never actually calls NewLocalRef. It is assumed that all objects
passed are already acquired with a local ref (as it usually is the case if you obtain
the object from a JNI method).
*/
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
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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