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| -rw-r--r-- | include/comphelper/numberedcollection.hxx | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/include/comphelper/numberedcollection.hxx b/include/comphelper/numberedcollection.hxx new file mode 100644 index 000000000..3dbb1f534 --- /dev/null +++ b/include/comphelper/numberedcollection.hxx @@ -0,0 +1,168 @@ +/* -*- 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_COMPHELPER_NUMBEREDCOLLECTION_HXX +#define INCLUDED_COMPHELPER_NUMBEREDCOLLECTION_HXX + +#include <comphelper/comphelperdllapi.h> + +#include <com/sun/star/uno/Reference.h> +#include <com/sun/star/frame/XUntitledNumbers.hpp> + +#include <cppuhelper/weakref.hxx> +#include <cppuhelper/implbase.hxx> + +#include <unordered_map> +#include <mutex> +#include <vector> + +namespace com::sun::star::uno { class XInterface; } + +namespace comphelper{ + +/** @short defines a collection of UNO components, where every component will get its own unique number. + + @descr Such number will be unique at runtime only... but it supports fragmentation. + Note: This collection uses weak references only to know her components. + So lifetime of these components must be controlled outside. + + @threadsafe + */ +class COMPHELPER_DLLPUBLIC NumberedCollection final : + public ::cppu::WeakImplHelper< css::frame::XUntitledNumbers > +{ + + // types, const + private: + + struct TNumberedItem + { + css::uno::WeakReference< css::uno::XInterface > xItem; + ::sal_Int32 nNumber; + }; + + typedef std::unordered_map< + sal_IntPtr, + TNumberedItem > TNumberedItemHash; + + typedef ::std::vector< sal_IntPtr > TDeadItemList; + + + // interface + public: + + + /** @short lightweight constructor. + */ + NumberedCollection(); + + + /** @short free all internally used resources. + */ + virtual ~NumberedCollection() override; + + + /** set an outside component which uses this container and must be set + as source of all broadcasted messages, exceptions. + + It's holded weak only so we do not need any complex dispose sessions. + + Note: Passing NULL as parameter will be allowed. It will reset the internal + member reference only. + + @param xOwner + the new owner of this collection. + */ + void setOwner (const css::uno::Reference< css::uno::XInterface >& xOwner); + + + /** set the localized prefix to be used for untitled components. + + Localization has to be done outside. This container will return + those value then. There are no further checks. Its up to you to define + a suitable string here :-) + + @param sPrefix + the new prefix for untitled components. + */ + void setUntitledPrefix(const OUString& sPrefix); + + + /** @see css.frame.XUntitledNumbers */ + virtual ::sal_Int32 SAL_CALL leaseNumber(const css::uno::Reference< css::uno::XInterface >& xComponent) override; + + + /** @see css.frame.XUntitledNumbers */ + virtual void SAL_CALL releaseNumber(::sal_Int32 nNumber) override; + + + /** @see css.frame.XUntitledNumbers */ + virtual void SAL_CALL releaseNumberForComponent(const css::uno::Reference< css::uno::XInterface >& xComponent) override; + + + /** @see css.frame.XUntitledNumbers */ + virtual OUString SAL_CALL getUntitledPrefix() override; + + + // internal + private: + + + /** @short tries to find a unique number not already used within this collection. + + @descr It reuses the smallest number which isn't used by any component + of this collection. (fragmentation!) If collection is full (means there + is no free number) the special value INVALID_NUMBER will be returned. + + @note Those method can't be called within a multithreaded environment. + Because such number won't be "reserved" for the call of these method + it can happen that two calls returns the same number (reasoned by the fact that first call + doesn't used the returned number already. + + So the outside code has to make sure that retrieving and using of those numbers + will be an atomic operation. + + @return a unique number or special value INVALID_NUMBER if collection is full. + */ + ::sal_Int32 impl_searchFreeNumber (); + + static void impl_cleanUpDeadItems ( TNumberedItemHash& lItems , + const TDeadItemList& lDeadItems); + + + // member + private: + + /// localized string to be used for untitled components + OUString m_sUntitledPrefix; + + /// cache of all "leased numbers" and its bound components + TNumberedItemHash m_lComponents; + + /// used as source of broadcasted messages or exceptions (can be null !) + css::uno::WeakReference< css::uno::XInterface > m_xOwner; + + std::mutex m_aMutex; +}; + +} // namespace comphelper + +#endif // INCLUDED_COMPHELPER_NUMBEREDCOLLECTION_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |