File indexing completed on 2024-09-29 07:53:04

 /*
     SPDX-FileCopyrightText: 2014-2015 Harald Sitter <sitter@kde.org>
 
     SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
 #ifndef MAPS_H
 #define MAPS_H
 
 #include "debug.h"
 #include <QMap>
 #include <QObject>
 
 #include <pulse/ext-stream-restore.h>
 #include <pulse/pulseaudio.h>
 
 #include <iterator>
 
 namespace QPulseAudio
 {
 // Used for typedefs.
 class Card;
 class Client;
 class Sink;
 class SinkInput;
 class Source;
 class SourceOutput;
 class StreamRestore;
 class Module;
 
 /**
  * @see MapBase
  * This class is nothing more than the QObject base since moc cannot handle
  * templates.
  */
 class MapBaseQObject : public QObject
 {
     Q_OBJECT
 
 public:
     virtual int count() const = 0;
     virtual QObject *objectAt(int index) const = 0;
     virtual int indexOfObject(QObject *object) const = 0;
 
 Q_SIGNALS:
     void aboutToBeAdded(int index);
     void added(int index);
     void aboutToBeRemoved(int index);
     void removed(int index);
 };
 
 /**
  * Maps a specific index to a specific object pointer.
  * This is used to give the unique arbitrary PulseAudio index of a PulseObject a
  * serialized list index. Namely it enables us to translate a discrete list
  * index to a pulse index to an object, and any permutation thereof.
  */
 template<typename Type, typename PAInfo>
 class MapBase : public MapBaseQObject
 {
 public:
     ~MapBase() override = default;
 
     const QMap<quint32, Type *> &data() const
     {
         return m_data;
     }
 
     int count() const override
     {
         return m_data.count();
     }
 
     int indexOfObject(QObject *object) const override
     {
         int index = 0;
         QMapIterator<quint32, Type *> it(m_data);
         while (it.hasNext()) {
             it.next();
             if (it.value() == object) {
                 return index;
             }
             index++;
         }
         return -1;
     }
 
     QObject *objectAt(int index) const override
     {
         return std::next(m_data.constBegin(), index).value();
     }
 
     void reset()
     {
         while (!m_data.isEmpty()) {
             removeEntry(m_data.lastKey());
         }
         m_pendingRemovals.clear();
     }
 
     void insert(Type *object)
     {
         Q_ASSERT(!m_data.contains(object->index()));
 
         int modelIndex = 0;
         for (auto it = m_data.constBegin(); it != m_data.constEnd(); ++it) {
             if (object->index() < it.key()) {
                 break;
             }
             modelIndex++;
         }
 
         Q_EMIT aboutToBeAdded(modelIndex);
         m_data.insert(object->index(), object);
         Q_ASSERT(modelIndex == m_data.keys().indexOf(object->index()));
         Q_EMIT added(modelIndex);
     }
 
     // Context is passed in as parent because context needs to include the maps
     // so we'd cause a circular dep if we were to try to use the instance here.
     // Plus that's weird separation anyway.
     void updateEntry(const PAInfo *info, QObject *parent)
     {
         Q_ASSERT(info);
 
         if (m_pendingRemovals.remove(info->index)) {
             // Was already removed again.
             return;
         }
 
         auto *obj = m_data.value(info->index, nullptr);
         if (!obj) {
             obj = new Type(parent);
         }
         obj->update(info);
 
         if (!m_data.contains(info->index)) {
             insert(obj);
         }
     }
 
     void removeEntry(quint32 index)
     {
         if (!m_data.contains(index)) {
             m_pendingRemovals.insert(index);
         } else {
             const int modelIndex = m_data.keys().indexOf(index);
             Q_EMIT aboutToBeRemoved(modelIndex);
             delete m_data.take(index);
             Q_EMIT removed(modelIndex);
         }
     }
 
 protected:
     QMap<quint32, Type *> m_data;
     QSet<quint32> m_pendingRemovals;
 };
 
 using SinkMap = MapBase<Sink, pa_sink_info>;
 using SinkInputMap = MapBase<SinkInput, pa_sink_input_info>;
 using SourceMap = MapBase<Source, pa_source_info>;
 using SourceOutputMap = MapBase<SourceOutput, pa_source_output_info>;
 using ClientMap = MapBase<Client, pa_client_info>;
 using CardMap = MapBase<Card, pa_card_info>;
 using ModuleMap = MapBase<Module, pa_module_info>;
 using StreamRestoreMap = MapBase<StreamRestore, pa_ext_stream_restore_info>;
 
 } // QPulseAudio
 
 #endif // MAPS_H