diff -u -r1.6 -r1.7
--- LCIODriver.java	27 Mar 2007 17:14:29 -0000	1.6
+++ LCIODriver.java	30 Apr 2007 23:58:54 -0000	1.7
@@ -3,6 +3,7 @@

 import java.io.File;
 import java.io.IOException;
 import java.util.Collection;

+import java.util.Collections;

 import org.lcsim.event.EventHeader;
 import org.lcsim.util.Driver;
 import org.lcsim.util.lcio.LCIOWriter;

@@ -15,42 +16,32 @@

 {
    private LCIOWriter writer;
    private String file;

+   private Collection<String> listIgnore;

    
    public LCIODriver(String file)
    {
       this.file = file;

-   } 

+   }

    public LCIODriver(File file)
    {
       this.file = file.getAbsolutePath();

-   }  
-   protected void startOfData()
-   {
-      try
-      {
-         writer = new LCIOWriter(file);
-      }
-      catch (IOException x)
-      {
-         throw new RuntimeException("Error opening LCIO file",x);
-      }      

    }
    public LCIODriver(String file, Collection<String> listIgnore)
    {

-      try
-      {
-         writer = new LCIOWriter(file, listIgnore);
-      }
-      catch (IOException x)
-      {
-         throw new RuntimeException("Error opening LCIO file",x);
-      }

+      this.file = file;
+      this.listIgnore = listIgnore;
+      

    }
    public LCIODriver(File file, Collection<String> listIgnore)
    {

+      this.file = file.getAbsolutePath();
+      this.listIgnore = listIgnore;
+   }
+   protected void startOfData()
+   {

       try
       {

-         writer = new LCIOWriter(file, listIgnore);

+         writer = new LCIOWriter(file,listIgnore == null ? Collections.EMPTY_SET : listIgnore);

       }
       catch (IOException x)
       {

@@ -67,8 +58,8 @@

       {
          throw new RuntimeException("Error writing LCIO file",x);
       }

-   }   
-

+   }
+   

    protected void endOfData()
    {
       try