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Author: [log in to unmask]
Date: Thu Sep  1 04:23:11 2016
New Revision: 4476

Log:
added filter for events with only one trigger

Added:
    java/trunk/recon/src/main/java/org/hps/recon/filtering/MonoTriggerFilterDriver.java

Added: java/trunk/recon/src/main/java/org/hps/recon/filtering/MonoTriggerFilterDriver.java
 =============================================================================
--- java/trunk/recon/src/main/java/org/hps/recon/filtering/MonoTriggerFilterDriver.java	(added)
+++ java/trunk/recon/src/main/java/org/hps/recon/filtering/MonoTriggerFilterDriver.java	Thu Sep  1 04:23:11 2016
@@ -0,0 +1,51 @@
+package org.hps.recon.filtering;
+
+import org.lcsim.event.EventHeader;
+import org.lcsim.event.GenericObject;
+import org.lcsim.util.Driver;
+import org.hps.record.epics.EpicsData;
+import org.hps.record.scalers.ScalerData;
+import org.hps.record.triggerbank.AbstractIntData;
+import org.hps.record.triggerbank.TIData;
+/**
+ * Keep events with exactly one trigger bit.
+ * Also keep EPICS events, and Scaler events.
+ * Drop all other events.
+ * 
+ * @author spaul
+ *
+ */
+public class MonoTriggerFilterDriver extends Driver
+{
+  public void process(EventHeader event) {
+
+    // 1. keep all events with EPICS data (could also use event tag = 31):
+    if (EpicsData.read(event) != null) return;
+
+    // 2. keep all events with Scaler data:
+    if (ScalerData.read(event) != null) return;
+
+    // 3. drop event if it doesn't have a TriggerBank
+    if (!event.hasCollection(GenericObject.class,"TriggerBank"))
+      throw new Driver.NextEventException();
+  
+    int triggers = 0;
+    // 4. keep event if it only has one trigger bit set:
+    for (GenericObject gob : event.get(GenericObject.class,"TriggerBank"))
+    {
+      if (!(AbstractIntData.getTag(gob) == TIData.BANK_TAG)) continue;
+      TIData tid = new TIData(gob);
+      if (tid.isSingle0Trigger()) triggers++;
+      if (tid.isSingle1Trigger()) triggers++;
+      if (tid.isPair0Trigger()) triggers++;
+      if (tid.isPair1Trigger()) triggers++;
+      if (tid.isPulserTrigger()) triggers++;
+      if (tid.isCalibTrigger()) triggers++;
+    }
+    if(triggers == 1)
+    /*tab*/return;
+    
+    // 5. Else, drop event:
+    throw new Driver.NextEventException();
+  }
+}