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Author: [log in to unmask]
Date: Thu Sep  3 12:29:41 2015
New Revision: 3511

Log:
Example analysis Driver showing how to use SVT track collections and how to filter out unwanted ones. 

Added:
    java/trunk/analysis/src/main/java/org/hps/analysis/examples/SvtTrackAnalysis.java   (with props)

Added: java/trunk/analysis/src/main/java/org/hps/analysis/examples/SvtTrackAnalysis.java
 =============================================================================
--- java/trunk/analysis/src/main/java/org/hps/analysis/examples/SvtTrackAnalysis.java	(added)
+++ java/trunk/analysis/src/main/java/org/hps/analysis/examples/SvtTrackAnalysis.java	Thu Sep  3 12:29:41 2015
@@ -0,0 +1,89 @@
+package org.hps.analysis.examples;
+
+import java.util.List;
+
+import org.hps.recon.tracking.StrategyType;
+import org.hps.recon.tracking.TrackType;
+import org.lcsim.event.EventHeader;
+import org.lcsim.event.Track;
+import org.lcsim.util.Driver;
+
+/**
+ * Example analysis {@link Driver} showing how to use SVT track collections
+ * and how to filter out unwanted ones. 
+ * 
+ * @author <a href="mailto:[log in to unmask]">Omar Moreno</a>
+ */
+public class SvtTrackAnalysis extends Driver {
+
+    // Collections
+    private String matchedTracksColName = "MatchedTracks";
+    private String tracksS456ColName    = "Tracks_s345_c2_e16";
+    private String tracksS123C4ColName  = "Tracks_s123_c4_e56";
+    private String tracksS123C5ColName  = "Tracks_s123_c5_e46";
+    
+    @Override
+    public void process(EventHeader event) { 
+        
+        // Check if an event has a specific collection and if it doesn't, 
+        // skip it  The default track collection is still "MatchedTracks"
+        // and refers to tracks found using the strategy seed 345, 
+        // confirm 2, extend 16.  
+        if (!event.hasCollection(Track.class, matchedTracksColName)) return;
+        
+        // Once the collection has been confirmed to exist in the event, 
+        // you can retrieve a reference to the collection from the event
+        // as follows.
+        List<Track> tracks = event.get(Track.class, matchedTracksColName);
+    
+        // The track collection can be iterated over and each track can 
+        // then be analyzed
+        for (Track track : tracks) { 
+           // Analysis Code goes here ... 
+        }
+        
+        // The other collections can be retrieved in a similar manner
+        
+        if (!event.hasCollection(Track.class, tracksS456ColName)) return;
+        tracks = event.get(Track.class, tracksS456ColName);
+       
+        // Analysis goes here ...
+        
+        if (!event.hasCollection(Track.class, tracksS123C4ColName)) return;
+        tracks = event.get(Track.class, tracksS123C4ColName);
+
+        // Analysis goes here ...
+        
+        if (!event.hasCollection(Track.class, tracksS123C5ColName)) return;
+        tracks = event.get(Track.class, tracksS123C5ColName);
+    
+        // Analysis goes here ...
+        
+        //
+        // If looking at all track collections, a filter can be used to look
+        // at only specific tracks
+        //
+        
+        // Check if the event has a LCIO Track collection to begin
+        if (!event.hasCollection(Track.class));
+        
+        // Get all LCIO Track collections from an event
+        List<List<Track>> trackCollections = event.get(Track.class);
+    
+        // Iterate over all track collections
+        for (List<Track> trackCollection : trackCollections) { 
+            
+            // Check if the collection has tracks.  If it does not, skip it.
+            if (trackCollection.isEmpty()) continue;
+           
+            // Use the track type to check if the tracks are from the
+            // collections of interest
+            
+            if (TrackType.getType(StrategyType.MATCHED_TRACKS) != trackCollection.get(0).getType()) continue;
+           
+            for (Track track : trackCollection) { 
+                // Analysis code goes here ...
+            }
+        }
+    }
+}