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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 .
+ */
+
+#ifndef INCLUDED_CONNECTIVITY_SOURCE_INC_JAVA_LOCALREF_HXX
+#define INCLUDED_CONNECTIVITY_SOURCE_INC_JAVA_LOCALREF_HXX
+
+#include <jni.h>
+
+
+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
+
+
+#endif // INCLUDED_CONNECTIVITY_SOURCE_INC_JAVA_LOCALREF_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */