deleteDocuments being ingnored

Hello,
I'm brand new to this, so hopefully you can help me. I'm
attempting to use the IndexReader object in lucene v2 to delete and readd
documents. I very easily set up an index and my documents are added. Now
I'm trying to update the same index by deleting the document before
readding. The problem is that it appears that my deleteDocument()
instruction is being ignored. I've tried using the IndexModifier object
and the IndexReader and both have the same behavior. If anyone can point
out my error, or help me debug this I'll be forever in your debt. Here is
the jist of the code.
This is the main section:
IndexWriter writer = new IndexWriter(indexDir,new
StandardAnalyzer(), false);
writer.setUseCompoundFile(false);
indexDirectory(writer, dataDir);
int numIndexed = writer.docCount();
writer.optimize();
writer.close();
Down at the point just before readding my document I have the following
code (i know batch is better, just doing it this for now):
IndexReader ir = IndexReader.open(indexDir);
System.out.println("" + ir.numDocs());
ir.delete(new Term("filename",f.getAbsolutePath()));
System.out.println("deletes?" + ir.hasDeletions());
ir.close();
if (deleted 0) {
System.out.println("deleted old index of " +
f.getAbsolutePath());
}
System.out.println("Indexing " + f.getAbsolutePath());
Document doc = new Document();
doc.add(new Field("contents",loadContents
(doc),Field.Store.N,Field.Index.TKENIZED));
doc.add(new Field("filename",
f.getAbsolutePath(),Field.Store.YES,Field.Index.TK ENIZED));
writer.addDocument(doc);
Thanks,
Chris