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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
+
+#include <com/sun/star/document/XActionLockable.hpp>
+#include <mutex>
+
+namespace framework{
+
+/** @short implements a guard, which can use the interface
+ <type scope="css::document">XActionLockable</type>.
+
+ @descr This guard should be used to be sure, that any lock will be
+ released. Otherwise the locked document can hinder the office on shutdown!
+*/
+class ActionLockGuard final
+{
+
+ // member
+
+ private:
+ std::mutex m_mutex;
+
+ /** @short points to the object, which can be locked from outside. */
+ css::uno::Reference< css::document::XActionLockable > m_xActionLock;
+
+ /** @short knows if a lock exists on the internal lock object
+ forced by this guard instance. */
+ bool m_bActionLocked;
+
+ // interface
+
+ public:
+
+ /** @short default ctor to initialize a "non working guard".
+
+ @descr That can be useful in cases, where no resource still exists,
+ but will be available next time. Then this guard can be used
+ in a mode "use guard for more than one resources".
+ */
+ ActionLockGuard()
+ : m_bActionLocked(false)
+ {
+ }
+
+ /** @short release this guard instance and make sure, that no lock
+ will exist afterwards on the internal wrapped resource.
+ */
+ ~ActionLockGuard()
+ {
+ unlock();
+ }
+
+ /** @short set a new resource for locking at this guard.
+
+ @descr This call will fail, if an internal resource already exists
+ and is currently locked.
+
+ @param xLock
+ points to the outside resource, which should be locked.
+
+ @return sal_True, if new resource could be set and locked.
+ sal_False otherwise.
+ */
+ bool setResource(const css::uno::Reference< css::document::XActionLockable >& xLock)
+ {
+ std::unique_lock g(m_mutex);
+
+ if (m_bActionLocked || !xLock.is())
+ return false;
+
+ m_xActionLock = xLock;
+ m_xActionLock->addActionLock();
+ m_bActionLocked = m_xActionLock->isActionLocked();
+
+ return true;
+ }
+
+ /** @short set a new resource for locking at this guard.
+
+ @descr This call will fail, if an internal resource already exists
+ and is currently locked.
+
+ @param xLock
+ points to the outside resource, which should be locked.
+
+ @return sal_True, if new resource could be set and locked.
+ sal_False otherwise.
+ */
+ void freeResource()
+ {
+ // SAFE -> ..........................
+ std::unique_lock aMutexLock(m_mutex);
+
+ css::uno::Reference< css::document::XActionLockable > xLock = m_xActionLock;
+ bool bLocked = m_bActionLocked;
+
+ m_xActionLock.clear();
+ m_bActionLocked = false;
+
+ aMutexLock.unlock();
+ // <- SAFE ..........................
+
+ if (bLocked && xLock.is())
+ xLock->removeActionLock();
+ }
+
+ /** @short unlock the internal wrapped resource, if it's not already done. */
+ void unlock()
+ {
+ std::unique_lock g(m_mutex);
+ if (m_bActionLocked && m_xActionLock.is())
+ {
+ m_xActionLock->removeActionLock();
+ // don't check for any locks here ...
+ // May another guard use the same lock object :-(
+ m_bActionLocked = false;
+ }
+ }
+};
+
+} // namespace framework
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */