Yes, see the Payload functionality and the BoostingTermQuery:
http://www.lucidimagination.com/search/?q=Payload
On Jul 9, 2009, at 6:42 PM, Eric Chu wrote:
Hi all,
I was wondering if there is any way to do a boost on the document
based on
which value is in a field matched by a query.
ie, (Sample code below)
- You have a document that contains 1 field with multiple values.
- Field has value ABC boosted by 2.0
- Field has value XYZ boosted by 3.0
- I want the query that matches value XYZ to be ranked higher then
the query
that matches value ABC
Is there a way to do this without slotting each value into a different
field?
Thanks for your time,
Eric
*Sample Code:*
import org.apache.lucene.document.Field;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Query;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.TopDocCollector;
import org.apache.lucene.search.Searcher;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.ScoreDoc;
public class LuceneScoreTest {
public static void main (String[] args){
try {
// build index
Directory index = buildIndex();
Searcher searcher = new IndexSearcher(index);
// query index
String[] queries = new String[2];
queries[0] = "+F1:(ABC)";
queries[1] = "+F1:(XYZ)";
for (int i=0 ; i<queries.length ; i++){
String query = queries[i];
System.out.println("==="+query+"===");
Query q = new QueryParser("", new
StandardAnalyzer()).parse(query);
TopDocCollector hitCollector = new TopDocCollector(100);
searcher.search(q,null,hitCollector);
TopDocs topDocs = hitCollector.topDocs();
// analyze results
if (topDocs!=null && topDocs.totalHits>0){
int totalHits = topDocs.totalHits;
ScoreDoc[] docs = topDocs.scoreDocs;
ScoreDoc doc;
Document document;
System.out.println("topDocs.getMaxScore():"+topDocs.getMaxScore());
System.out.println("topDocs.totalHits:"+totalHits);
if (docs!=null && docs.length>0){
for (int j = 0 ; j < docs.length ; j++){
doc = docs[j];
System.out.println("SCOREDOC[:"+j+"]
score:"+doc.score);
document = searcher.doc(doc.doc);
System.out.println("DOCUMENT[:"+j
+"]:"+document.get("F1"));
System.out.println("DOCUMENT[:"+j+"]
boost:"+document.getBoost());
}
}
}else{
System.out.println("No docs found.");
}
}
}catch (Exception e){
e.printStackTrace();
}
}
static Directory buildIndex () {
Directory index = new RAMDirectory();
IndexWriter w = null;
Document doc = null;
try {
w = new IndexWriter(index, new StandardAnalyzer(), true);
doc = new Document();
Field f2 = new Field("F1", "XYZ", Field.Store.YES,
Field.Index.TOKENIZED);
f2.setBoost(10.0f);
doc.add(f2);
Field f1 = new Field("F1", "ABC", Field.Store.YES,
Field.Index.TOKENIZED);
f1.setBoost(1.0f);
doc.add(f1);
w.addDocument(doc);
w.flush();
}catch (Exception e){
e.printStackTrace();
}finally{
try { if (w!=null) w.close(); }catch (Exception e){}
}
return index;
}
}
--------------------------
Grant Ingersoll
http://www.lucidimagination.com/
Search the Lucene ecosystem (Lucene/Solr/Nutch/Mahout/Tika/Droids)
using Solr/Lucene:
http://www.lucidimagination.com/search
---------------------------------------------------------------------
To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-user-h...@lucene.apache.org
