Re #7822. A method to clear all log values except the current one.

Takes all TimeSeriesProperty logs and clears out all entries
except the last one. Single value logs are left unchanged.

Code/Mantid/Framework/API/inc/MantidAPI/LogManager.h

@@ -143,6 +143,8 @@ namespace Mantid
 
       /// Empty the values out of all TimeSeriesProperty logs
       void clearTimeSeriesLogs();
+      /// Empty all but the last value out of all TimeSeriesProperty logs
+      void clearOutdatedTimeSeriesLogValues();
 
       /// Save the run to a NeXus file with a given group name
       virtual void saveNexus(::NeXus::File * file, const std::string & group,bool keepOpen=false) const;

Code/Mantid/Framework/API/src/LogManager.cpp

@@ -378,7 +378,22 @@ Kernel::Logger& LogManager::g_log = Kernel::Logger::get("LogManager");
     }
   }
 
-
+  /** Clears out all but the last entry of all logs of type TimeSeriesProperty
+   *  Check the documentation/definition of TimeSeriesProperty::clearOutdated for
+   *  the definition of 'last entry'.
+   */
+  void LogManager::clearOutdatedTimeSeriesLogValues()
+  {
+    auto & props = getProperties();
+    for ( auto it = props.begin(); it != props.end(); ++it)
+    {
+      if ( auto tsp = dynamic_cast<ITimeSeriesProperty*>(*it) )
+      {
+        tsp->clearOutdated();
+      }
+    }
+  }
+
   //--------------------------------------------------------------------------------------------
   /** Save the object to an open NeXus file.
    * @param file :: open NeXus file

Code/Mantid/Framework/API/test/LogManagerTest.h

@@ -259,7 +259,37 @@ class LogManagerTest : public CxxTest::TestSuite
     TS_ASSERT_EQUALS( runInfo.getPropertyValueAsType<int>(intProp), 99 );
   }
 
+  void clearOutdatedTimeSeriesLogValues()
+  {
+    // Set up a Run object with 3 properties in it (1 time series, 2 single value)
+    LogManager runInfo;
+    const std::string stringProp("aStringProp");
+    const std::string stringVal("testing");
+    runInfo.addProperty(stringProp,stringVal);
+    const std::string intProp("anIntProp");
+    runInfo.addProperty(intProp,99);
+    const std::string tspProp("tsp");
+    addTestTimeSeries(runInfo,"tsp");
 
+    // Check it's set up right
+    TS_ASSERT_EQUALS( runInfo.getProperties().size(), 3 );
+    auto tsp = runInfo.getTimeSeriesProperty<double>(tspProp);
+    TS_ASSERT_EQUALS( tsp->realSize(), 10 );
+
+    auto lastTime = tsp->lastTime();
+    auto lastValue = tsp->lastValue();
+
+    // Do the clearing work
+    TS_ASSERT_THROWS_NOTHING( runInfo.clearOutdatedTimeSeriesLogValues() );
+
+    // Check the time-series property has 1 entry, & the others are unchanged
+    TS_ASSERT_EQUALS( runInfo.getProperties().size(), 3 );
+    TS_ASSERT_EQUALS( tsp->realSize(), 1 );
+    TS_ASSERT_EQUALS( tsp->firstTime(), lastTime );
+    TS_ASSERT_EQUALS( tsp->firstValue(), lastValue );
+    TS_ASSERT_EQUALS( runInfo.getPropertyValueAsType<std::string>(stringProp), stringVal );
+    TS_ASSERT_EQUALS( runInfo.getPropertyValueAsType<int>(intProp), 99 );
+  }
 
   /** Save and load to NXS file */
   void test_nexus()