bc11ba676d
An emplace_hint with the iterator pointing at end() doesn't really help, so rather attempt an insert with a temporary value. Also check if the upper-case string we got back is the same as the input string, in which case, we can save memory by mapping the input string to itself. Change-Id: I40b9e2b65a831e44c4b88d51d835242a47d8a86d Reviewed-on: https://gerrit.libreoffice.org/72516 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <svl/sharedstringpool.hxx>
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#include <svl/sharedstring.hxx>
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#include <unotools/charclass.hxx>
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#include <osl/mutex.hxx>
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#include <unordered_map>
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#include <unordered_set>
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namespace svl {
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namespace {
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sal_Int32 getRefCount( const rtl_uString* p )
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{
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return (p->refCount & 0x3FFFFFFF);
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}
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}
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struct SharedStringPool::Impl
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{
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mutable osl::Mutex maMutex;
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// set of upper-case, so we can share these as the value in the maStrMap
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std::unordered_set<OUString> maStrPoolUpper;
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// map with rtl_uString* as key so we can avoid some ref-counting
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std::unordered_map<OUString,rtl_uString*> maStrMap;
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const CharClass& mrCharClass;
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explicit Impl( const CharClass& rCharClass ) : mrCharClass(rCharClass) {}
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};
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SharedStringPool::SharedStringPool( const CharClass& rCharClass ) :
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mpImpl(new Impl(rCharClass)) {}
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SharedStringPool::~SharedStringPool()
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{
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}
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SharedString SharedStringPool::intern( const OUString& rStr )
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{
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osl::MutexGuard aGuard(&mpImpl->maMutex);
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auto [mapIt,bInserted] = mpImpl->maStrMap.emplace(rStr, rStr.pData);
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if (bInserted)
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{
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// This is a new string insertion. Establish mapping to upper-case variant.
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OUString aUpper = mpImpl->mrCharClass.uppercase(rStr);
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if (aUpper == rStr)
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{
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auto insertResult = mpImpl->maStrPoolUpper.insert(rStr);
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mapIt->second = insertResult.first->pData;
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}
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else
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{
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auto insertResult = mpImpl->maStrPoolUpper.insert(aUpper);
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mapIt->second = insertResult.first->pData;
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}
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}
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return SharedString(mapIt->first.pData, mapIt->second);
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}
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void SharedStringPool::purge()
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{
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osl::MutexGuard aGuard(&mpImpl->maMutex);
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std::unordered_set<OUString> aNewStrPoolUpper;
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{
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auto it = mpImpl->maStrMap.begin(), itEnd = mpImpl->maStrMap.end();
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while (it != itEnd)
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{
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const rtl_uString* p = it->first.pData;
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if (getRefCount(p) == 1)
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it = mpImpl->maStrMap.erase(it);
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else
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{
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// Still referenced outside the pool. Keep it.
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aNewStrPoolUpper.insert(it->second);
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++it;
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}
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}
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}
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mpImpl->maStrPoolUpper = std::move(aNewStrPoolUpper);
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}
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size_t SharedStringPool::getCount() const
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{
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osl::MutexGuard aGuard(&mpImpl->maMutex);
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return mpImpl->maStrMap.size();
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}
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size_t SharedStringPool::getCountIgnoreCase() const
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{
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osl::MutexGuard aGuard(&mpImpl->maMutex);
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return mpImpl->maStrPoolUpper.size();
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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