6 files changed, 795 insertions, 0 deletions
diff --git a/svl/source/notify/SfxBroadcaster.cxx b/svl/source/notify/SfxBroadcaster.cxx
new file mode 100644
index 000000000..2e312a80c
--- /dev/null
+++ b/svl/source/notify/SfxBroadcaster.cxx
@@ -0,0 +1,178 @@
+/* -*- 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 .
+ */
+
+#include <svl/SfxBroadcaster.hxx>
+
+#include <svl/hint.hxx>
+#include <svl/lstner.hxx>
+#include <tools/debug.hxx>
+
+#include <algorithm>
+#include <cassert>
+#include <vector>
+
+
+typedef std::vector<SfxListener*> SfxListenerArr_Impl;
+
+struct SfxBroadcaster::Impl
+{
+    /** Contains the positions of removed listeners. */
+    std::vector<size_t>     m_RemovedPositions;
+    SfxListenerArr_Impl     m_Listeners;
+};
+
+// broadcast immediately
+
+void SfxBroadcaster::Broadcast( const SfxHint &rHint )
+{
+    // notify all registered listeners exactly once
+    for (size_t i = 0; i < mpImpl->m_Listeners.size(); ++i)
+    {
+        SfxListener *const pListener = mpImpl->m_Listeners[i];
+        if (pListener)
+            pListener->Notify( *this, rHint );
+    }
+}
+
+// unregister all listeners
+
+SfxBroadcaster::~SfxBroadcaster() COVERITY_NOEXCEPT_FALSE
+{
+    Broadcast( SfxHint(SfxHintId::Dying) );
+
+    // remove all still registered listeners
+    for (size_t i = 0; i < mpImpl->m_Listeners.size(); ++i)
+    {
+        SfxListener *const pListener = mpImpl->m_Listeners[i];
+        if (pListener)
+            pListener->RemoveBroadcaster_Impl(*this);
+    }
+}
+
+
+// simple ctor of class SfxBroadcaster
+
+SfxBroadcaster::SfxBroadcaster() : mpImpl(new Impl)
+{
+}
+
+
+// copy ctor of class SfxBroadcaster
+
+
+SfxBroadcaster::SfxBroadcaster( const SfxBroadcaster &rBC ) : mpImpl(new Impl)
+{
+    for (size_t i = 0; i < rBC.mpImpl->m_Listeners.size(); ++i)
+    {
+        SfxListener *const pListener = rBC.mpImpl->m_Listeners[i];
+        if (pListener)
+            pListener->StartListening( *this );
+    }
+}
+
+
+// add a new SfxListener to the list
+
+void SfxBroadcaster::AddListener( SfxListener& rListener )
+{
+    DBG_TESTSOLARMUTEX();
+    if (mpImpl->m_RemovedPositions.empty())
+    {
+        mpImpl->m_Listeners.push_back(&rListener);
+    }
+    else
+    {
+        size_t targetPosition = mpImpl->m_RemovedPositions.back();
+        mpImpl->m_RemovedPositions.pop_back();
+        assert(mpImpl->m_Listeners[targetPosition] == nullptr);
+        mpImpl->m_Listeners[targetPosition] = &rListener;
+    }
+}
+
+
+// forward a notification to all registered listeners
+
+void SfxBroadcaster::Forward(SfxBroadcaster& rBC, const SfxHint& rHint)
+{
+    for (size_t i = 0; i < mpImpl->m_Listeners.size(); ++i)
+    {
+        SfxListener *const pListener = mpImpl->m_Listeners[i];
+        if (pListener)
+            pListener->Notify( rBC, rHint );
+    }
+}
+
+
+// remove one SfxListener from the list
+
+void SfxBroadcaster::RemoveListener( SfxListener& rListener )
+{
+    DBG_TESTSOLARMUTEX();
+
+    // First, check the slots either side of the last removed slot, makes a significant
+    // difference when the list is large.
+    int positionOfRemovedElement = -1;
+    if (!mpImpl->m_RemovedPositions.empty())
+    {
+        auto i = mpImpl->m_RemovedPositions.back();
+        if (i < mpImpl->m_Listeners.size() - 2 && mpImpl->m_Listeners[i+1] == &rListener)
+        {
+            positionOfRemovedElement = i + 1;
+        }
+        else if (i > 0 && mpImpl->m_Listeners[i-1] == &rListener)
+        {
+            positionOfRemovedElement = i-1;
+        }
+    }
+    // then scan the whole list if we didn't find it
+    if (positionOfRemovedElement == -1)
+    {
+        SfxListenerArr_Impl::iterator aIter = std::find(
+                mpImpl->m_Listeners.begin(), mpImpl->m_Listeners.end(), &rListener);
+        positionOfRemovedElement = std::distance(mpImpl->m_Listeners.begin(), aIter);
+    }
+    // DO NOT erase the listener, set the pointer to 0
+    // because the current continuation may contain this->Broadcast
+    mpImpl->m_Listeners[positionOfRemovedElement] = nullptr;
+    mpImpl->m_RemovedPositions.push_back(positionOfRemovedElement);
+}
+
+bool SfxBroadcaster::HasListeners() const
+{
+    return (GetListenerCount() != 0);
+}
+
+size_t SfxBroadcaster::GetListenerCount() const
+{
+    assert(mpImpl->m_Listeners.size() >= mpImpl->m_RemovedPositions.size());
+    return mpImpl->m_Listeners.size() - mpImpl->m_RemovedPositions.size();
+}
+
+size_t SfxBroadcaster::GetSizeOfVector() const
+{
+    return mpImpl->m_Listeners.size();
+}
+
+SfxListener* SfxBroadcaster::GetListener( size_t nNo ) const
+{
+    return mpImpl->m_Listeners[nNo];
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/svl/source/notify/broadcast.cxx b/svl/source/notify/broadcast.cxx
new file mode 100644
index 000000000..586a09600
--- /dev/null
+++ b/svl/source/notify/broadcast.cxx
@@ -0,0 +1,267 @@
+/* -*- 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 .
+ */
+
+#include <svl/broadcast.hxx>
+#include <svl/listener.hxx>
+#include <svl/hint.hxx>
+#include <o3tl/safeint.hxx>
+#include <cassert>
+#include <algorithm>
+
+/**
+ Design Notes
+ -------------------------------
+
+ This class is extremely heavily used - we can have millions of broadcasters and listeners and we can also
+ have a broadcaster that has a million listeners.
+
+ So we do a number of things
+ (*) use a cache-dense listener list (std::vector) because caching effects dominate a lot of operations
+ (*) use a sorted list to speed up find operations
+ (*) only sort the list when we absolutely have to, to speed up sequential add/remove operations
+ (*) defer removing items from the list by (ab)using the last bit of the pointer
+
+ Also we have some complications around destruction because
+ (*) we broadcast a message to indicate that we are destructing
+ (*) which can trigger arbitrality complicated behaviour, including
+ (*) adding a removing things from the in-destruction object!
+
+*/
+
+static bool isDeletedPtr(SvtListener* p)
+{
+    /** mark deleted entries by toggling the last bit,which is effectively unused, since the struct we point
+     * to is at least 16-bit aligned. This allows the binary seach to continue working even when we have
+     * deleted entries */
+#if SAL_TYPES_SIZEOFPOINTER == 4
+    return (reinterpret_cast<sal_uInt32>(p) & 0x01) == 0x01;
+#else
+    return (reinterpret_cast<sal_uInt64>(p) & 0x01) == 0x01;
+#endif
+}
+
+static void markDeletedPtr(SvtListener*& rp)
+{
+#if SAL_TYPES_SIZEOFPOINTER == 4
+    reinterpret_cast<sal_uInt32&>(rp) |= 0x01;
+#else
+    reinterpret_cast<sal_uInt64&>(rp) |= 0x01;
+#endif
+}
+
+static void sortListeners(std::vector<SvtListener*>& listeners, size_t firstUnsorted)
+{
+    // Add() only appends new values, so often the container will be sorted expect for one
+    // or few last items. For larger containers it is much more efficient to just handle
+    // the unsorted part.
+    auto sortedEnd = firstUnsorted == 0
+        ? std::is_sorted_until(listeners.begin(),listeners.end())
+        : listeners.begin() + firstUnsorted;
+    if( listeners.end() - sortedEnd == 1 )
+    {   // Just one item, insert it in the right place.
+        SvtListener* item = listeners.back();
+        listeners.pop_back();
+        listeners.insert( std::upper_bound( listeners.begin(), listeners.end(), item ), item );
+    }
+    else if( o3tl::make_unsigned( sortedEnd - listeners.begin()) > listeners.size() * 3 / 4 )
+    {   // Sort the unsorted part and then merge.
+        std::sort( sortedEnd, listeners.end());
+        std::inplace_merge( listeners.begin(), sortedEnd, listeners.end());
+    }
+    else
+    {
+        std::sort(listeners.begin(), listeners.end());
+    }
+}
+
+void SvtBroadcaster::Normalize() const
+{
+    // clear empty slots first, because then we often have to do very little sorting
+    if (mnEmptySlots)
+    {
+        maListeners.erase(
+            std::remove_if(maListeners.begin(), maListeners.end(), [] (SvtListener* p) { return isDeletedPtr(p); }),
+            maListeners.end());
+        mnEmptySlots = 0;
+    }
+
+    if (mnListenersFirstUnsorted != static_cast<sal_Int32>(maListeners.size()))
+    {
+        sortListeners(maListeners, mnListenersFirstUnsorted);
+        mnListenersFirstUnsorted = maListeners.size();
+    }
+
+    if (!mbDestNormalized)
+    {
+        sortListeners(maDestructedListeners, 0);
+        mbDestNormalized = true;
+    }
+}
+
+void SvtBroadcaster::Add( SvtListener* p )
+{
+    assert(!mbDisposing && "called inside my own destructor?");
+    assert(!mbAboutToDie && "called after PrepareForDestruction()?");
+    if (mbDisposing || mbAboutToDie)
+        return;
+    // Avoid normalizing if the item appended keeps the container sorted.
+    auto nRealSize = static_cast<sal_Int32>(maListeners.size() - mnEmptySlots);
+    auto bSorted = mnListenersFirstUnsorted == nRealSize;
+    if (maListeners.empty() || (bSorted && maListeners.back() <= p))
+    {
+        ++mnListenersFirstUnsorted;
+        maListeners.push_back(p);
+        return;
+    }
+    // see if we can stuff it into an empty slot, which succeeds surprisingly often in
+    // some calc workloads where it removes and then re-adds the same listener
+    if (mnEmptySlots && bSorted)
+    {
+        auto it = std::lower_bound(maListeners.begin(), maListeners.end(), p);
+        if (it != maListeners.end() && isDeletedPtr(*it))
+        {
+            *it = p;
+            ++mnListenersFirstUnsorted;
+            --mnEmptySlots;
+            return;
+        }
+    }
+    maListeners.push_back(p);
+}
+
+void SvtBroadcaster::Remove( SvtListener* p )
+{
+    if (mbDisposing)
+        return;
+
+    if (mbAboutToDie)
+    {
+        // only reset mbDestNormalized if we are going to become unsorted
+        if (!maDestructedListeners.empty() && maDestructedListeners.back() > p)
+            mbDestNormalized = false;
+        maDestructedListeners.push_back(p);
+        return;
+    }
+
+    // We only need to fully normalize if one or more Add()s have been performed that make the array unsorted.
+    auto nRealSize = static_cast<sal_Int32>(maListeners.size() - mnEmptySlots);
+    if (mnListenersFirstUnsorted != nRealSize || (maListeners.size() > 1024 && maListeners.size() / nRealSize > 16))
+        Normalize();
+
+    auto it = std::lower_bound(maListeners.begin(), maListeners.end(), p);
+    assert (it != maListeners.end() && *it == p);
+    if (it != maListeners.end() && *it == p)
+    {
+        markDeletedPtr(*it);
+        ++mnEmptySlots;
+        --mnListenersFirstUnsorted;
+    }
+
+    if (maListeners.size() - mnEmptySlots == 0)
+        ListenersGone();
+}
+
+SvtBroadcaster::SvtBroadcaster()
+    : mnEmptySlots(0)
+    , mnListenersFirstUnsorted(0)
+    , mbAboutToDie(false)
+    , mbDisposing(false)
+    , mbDestNormalized(true)
+{}
+
+SvtBroadcaster::SvtBroadcaster( const SvtBroadcaster &rBC ) :
+    mnEmptySlots(0), mnListenersFirstUnsorted(0),
+    mbAboutToDie(false), mbDisposing(false),
+    mbDestNormalized(true)
+{
+    assert(!rBC.mbAboutToDie && "copying an object marked with PrepareForDestruction()?");
+    assert(!rBC.mbDisposing && "copying an object that is in its destructor?");
+
+    rBC.Normalize(); // so that insert into ourself is in-order, and therefore we do not need to Normalize()
+    maListeners.reserve(rBC.maListeners.size());
+    for (SvtListener* p : rBC.maListeners)
+         p->StartListening(*this); // this will call back into this->Add()
+}
+
+SvtBroadcaster::~SvtBroadcaster()
+{
+    mbDisposing = true;
+    Broadcast( SfxHint(SfxHintId::Dying) );
+
+    Normalize();
+
+    // now when both lists are sorted, we can linearly unregister all
+    // listeners, with the exception of those that already asked to be removed
+    // during their own destruction
+    ListenersType::const_iterator dest(maDestructedListeners.begin());
+    for (auto& rpListener : maListeners)
+    {
+        // skip the destructed ones
+        while (dest != maDestructedListeners.end() && (*dest < rpListener))
+            ++dest;
+
+        if (dest == maDestructedListeners.end() || *dest != rpListener)
+            rpListener->BroadcasterDying(*this);
+    }
+}
+
+void SvtBroadcaster::Broadcast( const SfxHint &rHint )
+{
+    Normalize();
+
+    ListenersType::const_iterator dest(maDestructedListeners.begin());
+    ListenersType aListeners(maListeners); // this copy is important to avoid erasing entries while iterating
+    for (auto& rpListener : aListeners)
+    {
+        // skip the destructed ones
+        while (dest != maDestructedListeners.end() && (*dest < rpListener))
+            ++dest;
+
+        if (dest == maDestructedListeners.end() || *dest != rpListener)
+            rpListener->Notify(rHint);
+    }
+}
+
+void SvtBroadcaster::ListenersGone() {}
+
+SvtBroadcaster::ListenersType& SvtBroadcaster::GetAllListeners()
+{
+    Normalize();
+    return maListeners;
+}
+
+const SvtBroadcaster::ListenersType& SvtBroadcaster::GetAllListeners() const
+{
+    Normalize();
+    return maListeners;
+}
+
+bool SvtBroadcaster::HasListeners() const
+{
+    return (maListeners.size() - mnEmptySlots) > 0;
+}
+
+void SvtBroadcaster::PrepareForDestruction()
+{
+    mbAboutToDie = true;
+    // the reserve() serves two purpose (1) performance (2) makes sure our iterators do not become invalid
+    maDestructedListeners.reserve(maListeners.size());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/svl/source/notify/hint.cxx b/svl/source/notify/hint.cxx
new file mode 100644
index 000000000..ad36d5098
--- /dev/null
+++ b/svl/source/notify/hint.cxx
@@ -0,0 +1,31 @@
+/* -*- 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 .
+ */
+
+
+#include <svl/hint.hxx>
+
+
+// virtual dtor for the typical base-class Hint
+
+SfxHint::~SfxHint() COVERITY_NOEXCEPT_FALSE
+{
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/svl/source/notify/isethint.cxx b/svl/source/notify/isethint.cxx
new file mode 100644
index 000000000..6f810240a
--- /dev/null
+++ b/svl/source/notify/isethint.cxx
@@ -0,0 +1,38 @@
+/* -*- 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 .
+ */
+
+
+#include <svl/isethint.hxx>
+#include <svl/itemset.hxx>
+
+
+/**
+ * Copies the SfxItemSet passed as a parameter.
+ */
+SfxItemSetHint::SfxItemSetHint( const SfxItemSet &rItemSet )
+:   _pItemSet( rItemSet.Clone() )
+{
+}
+
+SfxItemSetHint::~SfxItemSetHint()
+{
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/svl/source/notify/listener.cxx b/svl/source/notify/listener.cxx
new file mode 100644
index 000000000..51564ce9b
--- /dev/null
+++ b/svl/source/notify/listener.cxx
@@ -0,0 +1,108 @@
+/* -*- 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 .
+ */
+
+#include <svl/listener.hxx>
+#include <svl/broadcast.hxx>
+
+SvtListener::QueryBase::QueryBase( sal_uInt16 nId ) : mnId(nId) {}
+SvtListener::QueryBase::~QueryBase() {}
+
+sal_uInt16 SvtListener::QueryBase::getId() const
+{
+    return mnId;
+}
+
+SvtListener::SvtListener() {}
+
+SvtListener::SvtListener( const SvtListener & )  {}
+
+SvtListener::~SvtListener() COVERITY_NOEXCEPT_FALSE
+{
+    // Unregister itself from all broadcasters it's listening to.
+    EndListeningAll();
+}
+
+// registers at a specific SvtBroadcaster
+
+bool SvtListener::StartListening( SvtBroadcaster& rBroadcaster )
+{
+    std::pair<BroadcastersType::const_iterator, bool> r =
+        maBroadcasters.insert(&rBroadcaster);
+    if (r.second)
+    {
+        // This is a new broadcaster.
+        rBroadcaster.Add(this);
+    }
+    return r.second;
+}
+
+bool SvtListener::EndListening( SvtBroadcaster& rBroadcaster )
+{
+    BroadcastersType::const_iterator it = maBroadcasters.find(&rBroadcaster);
+    if (it == maBroadcasters.end())
+        // Not listening to this broadcaster.
+        return false;
+
+    rBroadcaster.Remove(this);
+    maBroadcasters.erase(it);
+    return true;
+}
+
+// called from the SvtBroadcaster destructor, used to avoid calling
+// back into the broadcaster again
+void SvtListener::BroadcasterDying( SvtBroadcaster& rBroadcaster )
+{
+    BroadcastersType::const_iterator it = maBroadcasters.find(&rBroadcaster);
+    if (it != maBroadcasters.end())
+        maBroadcasters.erase(it);
+}
+
+void SvtListener::EndListeningAll()
+{
+    for (SvtBroadcaster* p : maBroadcasters)
+    {
+        SvtBroadcaster& rBC = *p;
+        rBC.Remove(this);
+    }
+    maBroadcasters.clear();
+}
+
+
+void SvtListener::CopyAllBroadcasters( const SvtListener& r )
+{
+    EndListeningAll();
+    BroadcastersType aCopy(r.maBroadcasters);
+    maBroadcasters.swap(aCopy);
+    for (SvtBroadcaster* p : maBroadcasters)
+    {
+        p->Add(this);
+    }
+}
+
+bool SvtListener::HasBroadcaster() const
+{
+    return !maBroadcasters.empty();
+}
+
+void SvtListener::Notify( const SfxHint& /*rHint*/ ) {}
+
+void SvtListener::Query( QueryBase& /*rQuery*/ ) const {}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/svl/source/notify/lstner.cxx b/svl/source/notify/lstner.cxx
new file mode 100644
index 000000000..fe6f2b8af
--- /dev/null
+++ b/svl/source/notify/lstner.cxx
@@ -0,0 +1,173 @@
+/* -*- 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 .
+ */
+
+#include <svl/lstner.hxx>
+
+#include <svl/SfxBroadcaster.hxx>
+#include <sal/backtrace.hxx>
+#include <sal/log.hxx>
+
+#include <algorithm>
+#include <cassert>
+#include <vector>
+#include <memory>
+#include <map>
+
+struct SfxListener::Impl
+{
+    std::vector<SfxBroadcaster*> maBCs;
+#ifdef DBG_UTIL
+    std::map<SfxBroadcaster*, std::unique_ptr<sal::BacktraceState>>
+        maCallStacks;
+#endif
+};
+
+// simple ctor of class SfxListener
+
+SfxListener::SfxListener() : mpImpl(new Impl)
+{
+}
+
+// copy ctor of class SfxListener
+
+SfxListener::SfxListener( const SfxListener &rListener ) : mpImpl(new Impl)
+{
+    for ( size_t n = 0; n < rListener.mpImpl->maBCs.size(); ++n )
+        StartListening( *rListener.mpImpl->maBCs[n] );
+}
+
+// unregisters the SfxListener from its SfxBroadcasters
+
+SfxListener::~SfxListener() COVERITY_NOEXCEPT_FALSE
+{
+    // unregister at all remaining broadcasters
+    for ( size_t nPos = 0; nPos < mpImpl->maBCs.size(); ++nPos )
+    {
+        SfxBroadcaster *pBC = mpImpl->maBCs[nPos];
+        pBC->RemoveListener(*this);
+    }
+}
+
+
+// unregisters a specific SfxBroadcaster
+
+void SfxListener::RemoveBroadcaster_Impl( SfxBroadcaster& rBroadcaster )
+{
+    auto it = std::find( mpImpl->maBCs.begin(), mpImpl->maBCs.end(), &rBroadcaster );
+    if (it != mpImpl->maBCs.end()) {
+        mpImpl->maBCs.erase( it );
+#ifdef DBG_UTIL
+        mpImpl->maCallStacks.erase( &rBroadcaster );
+#endif
+    }
+}
+
+
+
+/**
+ Registers a specific SfxBroadcaster.
+
+ Some code uses duplicates as a kind of ref-counting thing i.e. they add and remove listeners
+ on different code paths, and they only really stop listening when the last EndListening() is called.
+*/
+void SfxListener::StartListening(SfxBroadcaster& rBroadcaster, DuplicateHandling eDuplicateHanding)
+{
+    bool bListeningAlready = IsListening( rBroadcaster );
+
+#ifdef DBG_UTIL
+    if (bListeningAlready && eDuplicateHanding == DuplicateHandling::Unexpected)
+    {
+        auto f = mpImpl->maCallStacks.find( &rBroadcaster );
+        SAL_WARN("svl", "previous StartListening call came from: " << sal::backtrace_to_string(f->second.get()));
+    }
+#endif
+    assert(!(bListeningAlready && eDuplicateHanding == DuplicateHandling::Unexpected) && "duplicate listener, try building with DBG_UTIL to find the other insert site.");
+
+    if (!bListeningAlready || eDuplicateHanding != DuplicateHandling::Prevent)
+    {
+        rBroadcaster.AddListener(*this);
+        mpImpl->maBCs.push_back( &rBroadcaster );
+#ifdef DBG_UTIL
+        mpImpl->maCallStacks.emplace( &rBroadcaster, sal::backtrace_get(10) );
+#endif
+        assert(IsListening(rBroadcaster) && "StartListening failed");
+    }
+}
+
+// unregisters a specific SfxBroadcaster
+
+void SfxListener::EndListening( SfxBroadcaster& rBroadcaster, bool bRemoveAllDuplicates )
+{
+    auto beginIt = mpImpl->maBCs.begin();
+    do
+    {
+        auto it = std::find( beginIt, mpImpl->maBCs.end(), &rBroadcaster );
+        if ( it == mpImpl->maBCs.end() )
+        {
+            break;
+        }
+        rBroadcaster.RemoveListener(*this);
+        beginIt = mpImpl->maBCs.erase( it );
+#ifdef DBG_UTIL
+        mpImpl->maCallStacks.erase( &rBroadcaster );
+#endif
+    }
+    while ( bRemoveAllDuplicates );
+}
+
+
+// unregisters all Broadcasters
+
+void SfxListener::EndListeningAll()
+{
+    std::vector<SfxBroadcaster*> aBroadcasters;
+    std::swap(mpImpl->maBCs, aBroadcasters);
+    for (SfxBroadcaster *pBC : aBroadcasters)
+        pBC->RemoveListener(*this);
+#ifdef DBG_UTIL
+    mpImpl->maCallStacks.clear();
+#endif
+}
+
+
+bool SfxListener::IsListening( SfxBroadcaster& rBroadcaster ) const
+{
+    return mpImpl->maBCs.end() != std::find( mpImpl->maBCs.begin(), mpImpl->maBCs.end(), &rBroadcaster );
+}
+
+sal_uInt16 SfxListener::GetBroadcasterCount() const
+{
+    return mpImpl->maBCs.size();
+}
+
+SfxBroadcaster* SfxListener::GetBroadcasterJOE( sal_uInt16 nNo ) const
+{
+    return mpImpl->maBCs[nNo];
+}
+
+
+// base implementation of notification handler
+
+void SfxListener::Notify( SfxBroadcaster& rBroadcaster, const SfxHint& )
+{
+    (void) rBroadcaster;
+    assert(IsListening(rBroadcaster));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */