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From lucene.u...@ajm.co.nz
Subject Deleting a document found in a search
Date Wed, 09 Oct 2002 11:50:50 GMT
I am just getting started with Lucene and I think I have a problem
understanding  some basic concepts.

I am using two-part identifiers to uniquely identify a document in the
index.  So whenever I want to index a document, I first want to find and
delete the old form.

To find it, I intend to use:

    BooleanQuery findOurs = new BooleanQuery();
    findOurs.add(new TermQuery(new Term("Id", id)), true, false);
    findOurs.add(new TermQuery(new Term("Domain", domain)), true, false);

    System.out.println("Deleting document matching: \"" +
                       findOurs.toString("") + '"');
    
    Searcher searcher = new IndexSearcher(directory);
    Hits hits = searcher.search(findOurs);

    // Assert: hits.length() <= 1

    for (int i = 0 ; i < hits.length() && i < 10; i++) {
      Document d = hits.doc(i);

      // Now what can I do to find document id?

      int id = ??????
	searcher.delete(id);
    }

But I can't discover how to convert a search result into a document id.  It
is recorded in the private HitDoc class, but since it is not publicly
accessible, there must be a reason why it would not work to add a public
getter for it.

Is there an alternative way that I can do this?  My first thought is to
define a Field.Keyword("composite-key", domain + "\u0000" + id).  This
would allow me to use the delete(Term) interface to delete the key.

-- 
Thanks, Adrian.

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