Re #9544. Filter events while the run was paused.

You might think that the DAS would not save events from when a run was
paused but no, that would be much to easy (for us). Therefore filter
them out if an ADARA-style pause log is present (i.e. this is SNS only).
There is a configuration property that can be set to load them as before.

Code/Mantid/Framework/DataHandling/inc/MantidDataHandling/LoadEventNexus.h

@@ -223,6 +223,7 @@ namespace Mantid
       static void loadTimeOfFlightData(::NeXus::File& file, DataObjects::EventWorkspace_sptr WS, 
         const std::string& binsName,size_t start_wi = 0, size_t end_wi = 0);
 
+      void filterDuringPause(API::MatrixWorkspace_sptr workspace);
 
     public:
       /// name of top level NXentry to use

Code/Mantid/Framework/DataHandling/src/LoadEventNexus.cpp

@@ -1166,6 +1166,9 @@ void LoadEventNexus::exec()
                            "These events were discarded.\n";
   }
 
+  // If the run was paused at any point, filter out those events (SNS only, I think)
+  filterDuringPause(WS);
+
   //add filename
   WS->mutableRun().addProperty("Filename",m_filename);
   //Save output
@@ -1191,6 +1194,8 @@ void LoadEventNexus::exec()
       this->setProperty<IEventWorkspace_sptr>("MonitorWorkspace", WS);
       // Set the internal monitor workspace pointer as well
       dataWS->setMonitorWorkspace(WS);
+      // If the run was paused at any point, filter out those events (SNS only, I think)
+      filterDuringPause(WS);
     }
     else
     {
@@ -2228,6 +2233,8 @@ void LoadEventNexus::runLoadMonitors()
     this->setProperty("MonitorWorkspace", mons);
     // Set the internal monitor workspace pointer as well
     WS->setMonitorWorkspace(mons);
+
+    filterDuringPause(mons);
   }
   catch (...)
   {
@@ -2622,6 +2629,28 @@ void LoadEventNexus::loadSampleDataISIScompatibility(::NeXus::File& file, Mantid
   file.closeGroup();
 }
 
+void LoadEventNexus::filterDuringPause(API::MatrixWorkspace_sptr workspace)
+{
+  try {
+    if ( ( ! ConfigService::Instance().hasProperty("loadeventnexus.keeppausedevents") ) && ( WS->run().getLogData("pause")->size() > 1 ) )
+    {
+      g_log.notice("Filtering out events when the run was marked as paused. "
+          "Set the loadeventnexus.keeppausedevents configuration property to override this.");
+
+      auto filter = createChildAlgorithm("FilterByLogValue");
+      filter->setProperty("InputWorkspace", workspace);
+      filter->setProperty("OutputWorkspace", workspace);
+      filter->setProperty("LogName", "pause");
+      // The log value is set to 1 when the run is paused, 0 otherwise.
+      filter->setProperty("MinimumValue", 0.0);
+      filter->setProperty("MaximumValue", 0.0);
+      filter->setProperty("LogBoundary", "Left");
+      filter->execute();
+    }
+  } catch ( Exception::NotFoundError& ) {
+    // No "pause" log, just carry on
+  }
+}
 
 } // namespace DataHandling
 } // namespace Mantid