hi everyone,
in lucene 4.0 alpha, I found the DocValues are available and gave
it a try. I am following the slides in
http://www.slideshare.net/lucenerevolution/willnauer-simon-doc-values-column-stride-fields-in-lucene
I have got 2 questions.
1. is DocValues updatable now?
2. How can I get docBase of an AtomicReader?
in Collector, it's easy to get docBase. But I need to get
docValues after scoring. I find
AtomicReader.getTopReaderContext().docBaseInParent
and subReader.getTopReaderContext().docBase. But neither of them is correct.
So I have to iterate through all subReaders and use maxDoc()
to find suitable subReader for a docID. any better method to find
corresponding AtomicReader of a docID?
File d=new File("./testIndex");
IndexWriterConfig cfg=new IndexWriterConfig(Version.LUCENE_40,
new
WhitespaceAnalyzer(Version.LUCENE_40));
cfg.setOpenMode(OpenMode.CREATE);
Directory dir=FSDirectory.open(d);
IndexWriter writer=new IndexWriter(dir,cfg);
FieldType titleFieldType=new FieldType();
titleFieldType.setStored(true);
titleFieldType.setIndexed(true);
titleFieldType.setTokenized(true);
titleFieldType.setOmitNorms(true);
Document doc=new Document();
Field f=new Field("title","a b c",titleFieldType);
doc.add(f);
FloatDocValuesField dvf=new FloatDocValuesField("pagerank",
0.8f);
doc.add(dvf);
writer.addDocument(doc);
doc=new Document();
doc.add(new Field("title","b d",titleFieldType));
dvf=new FloatDocValuesField("pagerank", 0.5f);
doc.add(dvf);
writer.addDocument(doc);
writer.commit();
doc=new Document();
doc.add(new Field("title","a c",titleFieldType));
dvf=new FloatDocValuesField("pagerank", 0.5f);
doc.add(dvf);
writer.addDocument(doc);
DirectoryReader reader=DirectoryReader.open(writer, true);
IndexSearcher searcher=new IndexSearcher(reader);
Query q=new TermQuery(new Term("title","a"));
TopDocs topDocs=searcher.search(q, 10);
Set<String> fieldsNeedLoaded=new HashSet<String>(1);
fieldsNeedLoaded.add("title");
@SuppressWarnings("unchecked")
List<AtomicReader> subReaders=(List<AtomicReader>)
reader.getSequentialSubReaders();
Source[] sources=new Source[subReaders.size()];
int idx=0;
for(AtomicReader subReader:subReaders){
sources[idx++]=subReader.docValues("pagerank").getSource();
}
for(int i=0;i<topDocs.totalHits;i++){
int docId=topDocs.scoreDocs[i].doc;
float score=topDocs.scoreDocs[i].score;
//get title
Document document=searcher.document(docId,
fieldsNeedLoaded);
System.out.println("title: " +document.get("title")+"
score: "+score);
idx=-1;
int docBase=0;
for(AtomicReader subReader:subReaders){
idx++;
//int
docBase=subReader.getTopReaderContext().docBaseInParent;
int realDoc=docId-docBase;
if(realDoc>=0&&realDoc<subReader.maxDoc()){
double
pagerank=sources[idx].getFloat(realDoc);
System.out.println(pagerank);
break;
}
docBase+=subReader.maxDoc();
}
}
}
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