[
http://issues.apache.org/jira/browse/LUCENE-527?page=comments#action_12371047 ]
Hoss Man commented on LUCENE-527:
---------------------------------
This is not a valid test case.
>From the documentation for TermDocs.skipTo...
Skips entries to the first beyond the current whose document number is greater
than or equal to target.
It returns true or false to indicate if there was any such entry, and the doc()
method should be used to check and see what the first document it found was --
you can't assume it will be the same as the docId you specified.
i believe the test will demonstrate what you expect, if you replace your j-loop
with...
for (int j=0; j<terms.length; j++){
TermDocs td = reader.termDocs( new Term("contents", terms[j]) );
if (td.skipTo(docID) && td.doc() == docID) {
System.out.println( "Term '" + terms[j] + "' occures " +
td.freq() + " time(s) in document nr. " + docID );
}
}
> Bug in the TermDocs.freq() method?
> -----------------------------------
>
> Key: LUCENE-527
> URL: http://issues.apache.org/jira/browse/LUCENE-527
> Project: Lucene - Java
> Type: Bug
> Versions: 1.9
> Environment: Scientific linux
> Reporter: Håkon T. Bommen
>
> I belive I get incorrect data from the TermDocs.freq() method. The attached
> code demonstrate this. Document one has correct term count. In document zero
> and two, the term "stored" and "indexed" is reported to occure once in both
> documents. This is incorrect.
> // LuceneTest.java
> import org.apache.lucene.analysis.Analyzer;
> import org.apache.lucene.analysis.standard.StandardAnalyzer;
> import org.apache.lucene.queryParser.ParseException;
> import org.apache.lucene.document.*;
> import org.apache.lucene.index.*;
> import org.apache.lucene.search.*;
> import org.apache.lucene.queryParser.QueryParser;
> import org.apache.lucene.store.RAMDirectory;
> import org.apache.lucene.store.Directory;
> public class LuceneTest{
> public LuceneTest(){}
> public static void main(String[] args){
> IndexWriter writer;
> IndexReader reader;
> Searcher searcher;
> Document doc;
> Directory dir = new RAMDirectory();
> try{
> // create index
> writer = new IndexWriter( dir , new StandardAnalyzer(),
> true);
> doc = new Document();
> doc.add( new Field( "title", "Doc 0", Field.Store.YES,
> Field.Index.TOKENIZED ) );
> doc.add( new Field( "contents", "Text Text and more
> Text", Field.Store.NO, Field.Index.TOKENIZED ) );
> writer.addDocument(doc);
> doc = new Document();
> doc.add( new Field( "title", "Doc 1", Field.Store.YES,
> Field.Index.TOKENIZED ) );
> doc.add( new Field( "contents", "This text is not
> stored, only indexed.", Field.Store.NO, Field.Index.TOKENIZED ) );
> writer.addDocument(doc);
> doc = new Document();
> doc.add( new Field( "title", "Doc 2", Field.Store.YES,
> Field.Index.TOKENIZED ) );
> doc.add( new Field( "contents", "Text Text Text Text",
> Field.Store.NO, Field.Index.TOKENIZED ) );
> writer.addDocument(doc);
> writer.close();
> // search
> searcher = new IndexSearcher(dir);
> reader = IndexReader.open(dir);
> QueryParser qp = new QueryParser("contents", new
> StandardAnalyzer());
> Query query = qp.parse("stored and indexed text");
> String[] terms = {"stored", "indexed", "text"};
> Hits queryHits = searcher.search(query);
> // print results
> System.out.println( "Found " + queryHits.length() + "
> hits.");
> for(int i=0; i<queryHits.length(); i++){
> doc = queryHits.doc(i);
> System.out.println("*** " + doc.get("title") +
> " ***");
> int docID = queryHits.id(i);
> for (int j=0; j<terms.length; j++){
> TermDocs td = reader.termDocs( new
> Term("contents", terms[j]) );
> td.skipTo(docID);
> System.out.println( "Term '" + terms[j]
> + "' occures " +
> td.freq() + " time(s) in
> document nr. " + docID );
> }
> }
> }catch(Exception e){System.out.println("Darn");}
> }
> }
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