Thanks Ahmet. This answers my question.
On Fri, Jul 31, 2009 at 1:30 PM, AHMET ARSLAN <[email protected]> wrote:
>
>
> > Given a term say "apache", I want to look up the lucene index
> > programmatically to find out its frequency in the corpus.
>
> I think you are asking collection frequency of a term. Term Frequency is
> defined between a document and a term which is printed in the loop in the
> following code. And at the end there is collection freq. which sum of tfs.
>
> String path = "E:\\ThesaurusSolrHome\\data\\index";
> String field = "contents";
> Term term = new Term(field, "apache");
>
> IndexReader indexReader = IndexReader.open(path);
>
> TermDocs termDocs = indexReader.termDocs(term);
> int collectionFreq = 0;
> while (termDocs.next()) {
> System.out.print("Document " + termDocs.doc() + " contains the
> term " + term.text() + " ");
> System.out.println(termDocs.freq() + " times");
> collectionFreq += termDocs.freq();
> }
> indexReader.close();
> System.out.println("Collection frequency of " + term.text() + " = "
> + collectionFreq);
>
>
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