Initial commit

Lts/Services/AudioVideoManagement/stream_name_mapping.cpp

@@ -0,0 +1,143 @@
+/**
+  * @RDE_HEADER@
+  * StreamNameMapping
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Fröbel, NLSE, 2018-03-12
+  */
+
+#include "stream_name_mapping.h"
+#include "audio_video_handler_impl.h"
+#include <AudioVideoManagement/avm.hpp>
+#include <AudioVideoManagement/avm_dtc.h>
+#include <LtsUtilsCore/data_modification_enum.h>
+#include <QtGlobal>
+#include <QString>
+
+namespace
+{
+
+/**
+ * Same as in AudioVideoHandlerImpl::internalStreamName() but only used as a fallback
+ * in case someone requests a name for an unknown MountingPoint.
+ *
+ * This would not be needed if we could rely on consistent data.
+ */
+QString fallbackStreamName(int mountingPointId)
+{
+  return AudioVideoManagement::AudioVideoHandlerImpl::internalStreamName(mountingPointId);
+}
+
+} // anonymous namespace
+
+
+namespace AudioVideoManagement
+{
+
+StreamNameMapping *StreamNameMapping::create(Interface::Dtc *dtc)
+{
+  Q_ASSERT(dtc);
+  StreamNameMapping   *mapping = new StreamNameMapping;
+  QObject::connect(dtc, &Interface::Dtc::streamNameChanged, mapping, &StreamNameMapping::onStreamNameChanged);
+
+  dtc->streamNames([mapping](const StreamName & streamName) { mapping->onStreamNameChanged(streamName, DataModification::eAdded); });
+
+  return mapping;
+}
+
+QString StreamNameMapping::internalName(int32_t mountingPointId) const
+{
+  const auto  &found = m_mpToNames.find(mountingPointId);
+  if (found != m_mpToNames.end())
+    return found->second.internal;
+
+  // We can never be sure that DDS-based data is consistent.
+  // In case someone refers to a MountingPoint that either does not exist anymore
+  // or for which the mapping was not yet published, we supply a fallback stream name.
+  return fallbackStreamName(mountingPointId);
+}
+
+QString StreamNameMapping::displayName(int32_t mountingPointId) const
+{
+  const auto  &found = m_mpToNames.find(mountingPointId);
+  if (found != m_mpToNames.end())
+    return found->second.display;
+
+  return fallbackStreamName(mountingPointId);
+}
+
+QString StreamNameMapping::internalName(const QString &displayName)
+{
+  for (const auto &keyValue : m_mpToNames)
+    if (keyValue.second.display == displayName)
+      return keyValue.second.internal ;
+  return (displayName);
+}
+
+QString StreamNameMapping::displayName(const QString &internalName) const
+{
+  bool            matched = m_extractor.exactMatch(internalName);
+  const QString   effectiveStreamName = matched ? m_extractor.cap(1) : internalName;
+  const QString   sourceSpecifier = matched ? m_extractor.cap(2) : QString();
+
+  const auto  &found = m_internalToDisplay.find(effectiveStreamName);
+  if (found == m_internalToDisplay.end())
+    return internalName; // no translation
+
+  return found->second + sourceSpecifier;
+}
+
+std::vector<StreamNameMapping::Names> StreamNameMapping::allNames() const
+{
+  std::vector<Names>   names;
+  names.reserve(m_mpToNames.size());
+
+  for (const auto &keyValue : m_mpToNames)
+    names.push_back(keyValue.second);
+
+  return names;
+}
+
+void StreamNameMapping::onStreamNameChanged(const StreamName &streamName, DataModification modType)
+{
+  switch (modType)
+  {
+  case DataModification::eAdded:
+  case DataModification::eModified:
+    define(streamName.mountingPointId(), {QString::fromStdString(streamName.internalName()), QString::fromStdString(streamName.displayName())});
+    return;
+
+  case DataModification::eRemoved:
+    remove(streamName.mountingPointId());
+    return;
+  }
+  Q_ASSERT(false);
+}
+
+void StreamNameMapping::define(int32_t mountingPointId, const StreamNameMapping::Names &names)
+{
+  m_mpToNames[mountingPointId] = names;
+  m_internalToDisplay[names.internal] = names.display;
+  emit changed(mountingPointId, names.internal, names.display);
+}
+
+void StreamNameMapping::remove(int32_t mountingPointId)
+{
+  const auto   found = m_mpToNames.find(mountingPointId);
+  Q_ASSERT(found != m_mpToNames.end());
+  // sometimes we get a double remove during logout so make sure we don't crash here
+  if (found == m_mpToNames.end())
+    return;
+
+  const Names   &names = found->second;
+  QString        internalName = names.internal;
+
+  size_t   removeCount = m_internalToDisplay.erase(names.internal);
+  Q_ASSERT(removeCount == 1);
+
+  m_mpToNames.erase(found);
+  emit changed(mountingPointId, internalName, internalName);
+}
+
+} // namespace AudioVideoManagement