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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/.
*/
#include <svl/sharedstringpool.hxx>
#include <svl/sharedstring.hxx>
#include <unotools/charclass.hxx>
#include <osl/mutex.hxx>
#include <unordered_map>
#include <unordered_set>
namespace svl {
namespace {
inline sal_Int32 getRefCount( const rtl_uString* p )
{
return (p->refCount & 0x3FFFFFFF);
}
typedef std::unordered_set<OUString, OUStringHash> StrHashType;
typedef std::pair<StrHashType::iterator, bool> InsertResultType;
typedef std::unordered_map<const rtl_uString*, OUString> StrStoreType;
InsertResultType findOrInsert( StrHashType& rPool, const OUString& rStr )
{
StrHashType::iterator it = rPool.find(rStr);
bool bInserted = false;
if (it == rPool.end())
{
// Not yet in the pool.
std::pair<StrHashType::iterator, bool> r = rPool.insert(rStr);
if (!r.second)
// Insertion failed.
return InsertResultType(rPool.end(), false);
it = r.first;
bInserted = true;
}
return InsertResultType(it, bInserted);
}
}
struct SharedStringPool::Impl
{
mutable osl::Mutex maMutex;
StrHashType maStrPool;
StrHashType maStrPoolUpper;
StrStoreType maStrStore;
const CharClass* mpCharClass;
explicit Impl( const CharClass* pCharClass ) : mpCharClass(pCharClass) {}
};
SharedStringPool::SharedStringPool( const CharClass* pCharClass ) :
mpImpl(new Impl(pCharClass)) {}
SharedStringPool::~SharedStringPool()
{
delete mpImpl;
}
SharedString SharedStringPool::intern( const OUString& rStr )
{
osl::MutexGuard aGuard(&mpImpl->maMutex);
InsertResultType aRes = findOrInsert(mpImpl->maStrPool, rStr);
if (aRes.first == mpImpl->maStrPool.end())
// Insertion failed.
return SharedString();
rtl_uString* pOrig = aRes.first->pData;
if (!mpImpl->mpCharClass)
// We don't track case insensitive strings.
return SharedString(pOrig, NULL);
if (!aRes.second)
{
// No new string has been inserted. Return the existing string in the pool.
StrStoreType::iterator it = mpImpl->maStrStore.find(pOrig);
if (it == mpImpl->maStrStore.end())
return SharedString();
rtl_uString* pUpper = it->second.pData;
return SharedString(pOrig, pUpper);
}
// This is a new string insertion. Establish mapping to upper-case variant.
OUString aUpper = mpImpl->mpCharClass->uppercase(rStr);
aRes = findOrInsert(mpImpl->maStrPoolUpper, aUpper);
if (aRes.first == mpImpl->maStrPoolUpper.end())
// Failed to insert or fetch upper-case variant. Should never happen.
return SharedString();
mpImpl->maStrStore.insert(StrStoreType::value_type(pOrig, *aRes.first));
return SharedString(pOrig, aRes.first->pData);
}
void SharedStringPool::purge()
{
osl::MutexGuard aGuard(&mpImpl->maMutex);
StrHashType aNewStrPool;
StrHashType::iterator it = mpImpl->maStrPool.begin(), itEnd = mpImpl->maStrPool.end();
for (; it != itEnd; ++it)
{
const rtl_uString* p = it->pData;
if (getRefCount(p) == 1)
{
// Remove it from the upper string map. This should unref the
// upper string linked to this original string.
mpImpl->maStrStore.erase(p);
}
else
// Still referenced outside the pool. Keep it.
aNewStrPool.insert(*it);
}
mpImpl->maStrPool.swap(aNewStrPool);
aNewStrPool.clear(); // for re-use.
// Purge the upper string pool as well.
it = mpImpl->maStrPoolUpper.begin();
itEnd = mpImpl->maStrPoolUpper.end();
for (; it != itEnd; ++it)
{
const rtl_uString* p = it->pData;
if (getRefCount(p) > 1)
aNewStrPool.insert(*it);
}
mpImpl->maStrPoolUpper.swap(aNewStrPool);
}
size_t SharedStringPool::getCount() const
{
osl::MutexGuard aGuard(&mpImpl->maMutex);
return mpImpl->maStrPool.size();
}
size_t SharedStringPool::getCountIgnoreCase() const
{
osl::MutexGuard aGuard(&mpImpl->maMutex);
return mpImpl->maStrPoolUpper.size();
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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