1 files changed, 95 insertions, 0 deletions
diff --git a/connectivity/source/inc/java/LocalRef.hxx b/connectivity/source/inc/java/LocalRef.hxx
new file mode 100644
index 000000000..ad40737f8
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+++ b/connectivity/source/inc/java/LocalRef.hxx
@@ -0,0 +1,95 @@
+/* -*- 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: */