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import hep.io.stdhep.StdhepEvent;
import hep.io.stdhep.StdhepReader;
import hep.io.stdhep.StdhepRecord;
import hep.io.stdhep.StdhepWriter;
import java.io.EOFException;
import java.io.IOException;
 
/**
 * A simple class for filtering stdhep events
 */
public class StdhepFilter
{
   public static void main( String[] args ) throws IOException
   {
      int nRecord = 0;
      int nIn = 0;
      int nOut = 0;
 
      StdhepReader reader = new StdhepReader("inputfile.stdhep");
      StdhepWriter writer = new StdhepWriter("outputfile.stdhep",reader.getTitle(),reader.getComment(),0);
 
      try
      {
         for (;;)
         {
            StdhepRecord record = reader.nextRecord();
            nRecord++;
            if (record instanceof StdhepEvent)
            {
               StdhepEvent event = (StdhepEvent) record;
               nIn++;
               // Insert your filter code here!
               if (event.getNHEP() < 100) continue;
            }
            writer.writeRecord(record);
            nOut++;
         }
      }
      catch (EOFException x)
      {
         // No problem
      }
      finally
      {
         writer.close();
         reader.close();
         System.out.println("Records: "+nRecord+" Events: "+nIn+" Out: "+nOut);
      }
   }
}