Thanks Simon!
On 29.10.2012 г. 21:38, Simon Willnauer wrote:
you should call currDocsAndPositions.nextPosition() before you call
currDocsAndPositions.getPayload() payloads are per positions so you
need to advance the pos first!
simon
On Mon, Oct 29, 2012 at 6:44 PM, Ivan Vasilev <ivasi...@sirma.bg> wrote:
Hi Guys,
I use the following code to index documents and set Payloads to term
positions:
public class TestPayloads_ {
private static final String INDEX_DIR =
"E:/Temp/Index";
public static void main(String[] args) throws Exception {
IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_40, new
MyAnalyzer_());
iwc.setOpenMode(OpenMode.CREATE);
IndexWriter writer = new IndexWriter(FSDirectory.open(new
File(INDEX_DIR)), iwc);
FieldType fieldType = new FieldType();
IndexOptions indexOptions =
IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS;
fieldType.setIndexOptions(indexOptions);
fieldType.setIndexed(true);
fieldType.setOmitNorms(true);
fieldType.setStored(true);
fieldType.freeze();
Document doc = new Document();
doc.add(new Field("content", "one two three four.", fieldType));
writer.addDocument(doc);
writer.addDocument(doc);
writer.addDocument(doc);
writer.close();
DirectoryReader dr = DirectoryReader.open(FSDirectory.open(new
File(INDEX_DIR)));
AtomicReader sr = dr.leaves().get(0).reader();
Bits liveDocs = sr.getLiveDocs();
Fields fields = sr.fields();
for (String currFieldName : fields) {
Terms currTerms = fields.terms(currFieldName);
TermsEnum currTermEnum = currTerms.iterator(null);
boolean currTermsHasPayloads = currTerms.hasPayloads();
BytesRef currFieldValue;
while ((currFieldValue = currTermEnum.next()) != null) {
String currVfieldValueStr = currFieldValue.utf8ToString();
// DocsEnum currDocsEnum = currTermEnum.docs(liveDocs,
null);
DocsAndPositionsEnum currDocsAndPositions =
currTermEnum.docsAndPositions(liveDocs, null,
DocsAndPositionsEnum.FLAG_PAYLOADS
| DocsAndPositionsEnum.FLAG_OFFSETS);
int docID;
while ((docID = currDocsAndPositions.nextDoc()) !=
DocsEnum.NO_MORE_DOCS) {
int freq = currDocsAndPositions.freq();
for (int i = 0; i < freq; i++) {
byte payload;
if (currTermsHasPayloads &&
currDocsAndPositions.getPayload() != null) {
payload =
currDocsAndPositions.getPayload().bytes[0];
} else {
payload = -1;
}
System.out.println("Term: (" + currFieldName + ":" +
currVfieldValueStr + "); doc: "
+ docID + "; position: " +
currDocsAndPositions.nextPosition()
+ "; payload: " + payload);
}
}
}
}
dr.close();
}
}
class MyAnalyzer_ extends Analyzer {
@Override
protected TokenStreamComponents createComponents(String fieldName,
Reader reader) {
Tokenizer tokenizer = new StandardTokenizer(Version.LUCENE_40,
reader);
return new TokenStreamComponents(tokenizer, new
MyFilter_(tokenizer));
}
}
class MyFilter_ extends TokenFilter {
private PayloadAttribute payloadAttr;
private byte[] payloadVal;
MyFilter_(TokenStream in) {
super(in);
payloadAttr = addAttribute(PayloadAttribute.class);
payloadVal = new byte[1];
}
public final boolean incrementToken() throws IOException {
if (input.incrementToken()) {
payloadVal[0]++;
payloadAttr.setPayload(new BytesRef(payloadVal));
return true;
} else {
return false;
}
}
}
The output is the following:
Term: (content:four); doc: 0; position: 3; payload: -1
Term: (content:four); doc: 1; position: 3; payload: 4
Term: (content:four); doc: 2; position: 3; payload: 8
Term: (content:one); doc: 0; position: 0; payload: -1
Term: (content:one); doc: 1; position: 0; payload: 1
Term: (content:one); doc: 2; position: 0; payload: 5
Term: (content:three); doc: 0; position: 2; payload: -1
Term: (content:three); doc: 1; position: 2; payload: 3
Term: (content:three); doc: 2; position: 2; payload: 7
Term: (content:two); doc: 0; position: 1; payload: -1
Term: (content:two); doc: 1; position: 1; payload: 2
Term: (content:two); doc: 2; position: 1; payload: 6
The payloads of document with Lucene ID #0 were not added. Payloads that
were intended to doc #0 were added to doc #1, those intended for doc #1 were
added to doc #2.
With the debugger I see that during adding doc #0 payloadVal is incremented
form 1 to 4, and after each incrementation is invoked
payloadAttr.setPayload(..), but strangely when reading
DocsAndPositionsEnumwe see those payloads (1 to 4) belong actually to doc
#1.
Do I make some mistake with invoking setPayload(..) method or it is a bug?
Cheers,
Ivan Vasilev
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