Hi,
I'm trying to extract payloads from an index for specific tokens the
following way (inserting sample document number and term):
Terms terms = reader.getTermVector(16504, "term");
TokenStream tokenstream = TokenSources.getTokenStream(terms);
while (tokenstream.incrementToken()) {
OffsetAttribute offset = tokenstream.getAttribute(OffsetAttribute.class);
int start = offset.startOffset();
int end = offset.endOffset();
String token =
tokenstream.getAttribute(CharTermAttribute.class).toString();
PayloadAttribute payloadAttr =
tokenstream.addAttribute(PayloadAttribute.class);
BytesRef payloadBytes = payloadAttr.getPayload();
...
}
This works fine for the OffsetAttribute and the CharTermAttribute, but
payloadAttr.getPayload() always returns null for all documents and all
tokens, unfortunately. However, I know that the payloads are stored in
the index as I can retrieve them through a SpanQuery with
Spans.getPayload(). I actually expect every token to carry a payload, as
I'm my custom tokenizer implementation has the following lines:
public class KoraTokenizer extends Tokenizer {
...
private PayloadAttribute payloadAttr =
addAttribute(PayloadAttribute.class);
...
public boolean incrementToken() {
...
payloadAttr.setPayload(new BytesRef(payloadString));
...
}
...
}
I've asserted that the payloadString variable is never an empty String
and as I said above, I can retrieve the Payloads with
Spans.getPayload(). So what do I do wrong in my
tokenstream.addAttribute(PayloadAttribute.class) call? BTW, I used
tokenstream.getAttribute() before as for the other attributes but this
obviously threw an IllegalArgumentException so I implemented the
recommendation given in the documentation and replaced it by addAttribute().
Thanks!
Carsten
--
Institut für Deutsche Sprache | http://www.ids-mannheim.de
Projekt KorAP | http://korap.ids-mannheim.de
Tel. +49-(0)621-43740789 | schno...@ids-mannheim.de
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Next Generation Corpus Analysis Platform
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