On Wed, Oct 13, 2010 at 04:37:37PM +0100, Sykes, Derek wrote:
> Hi there,
>
> I'm currently trying to work out how I can determine the type
> (string/number/date/etc)of a term. I've not seen any off the shelf way to do
> it so am trying to store a payload against each term that records the type.
>
> I'm having a little trouble retrieving a payload I'd stored onto the term.
> At the moment I'm using the TypeAsPayloadTokenFilter, however I'll change
> this soon as it's not really what I'm after.
>
> I'm then getting a TermEnum from either reader.terms() or using a
> PrefixTermEnum.
>
> For each term I want the payload from I'm running this function:
>
> private String getPayload(Term term) {
> String payload = null;
> try {
> TermPositions termPositions = reader.termPositions(term);
> termPositions.next();
> if (termPositions.isPayloadAvailable()) {
> byte[] payloadBytes = new
> byte[termPositions.getPayloadLength()];
> payloadBytes = termPositions.getPayload(payloadBytes, 0);
> payload = new String(payloadBytes);
> LOG.debug(payload);
> }
> }
> catch( IOException e) {
> ...
>
> This never returns anything though.
Hi,
my guess is that you need to call nextPosition, why not something like
this :
// goto to the doc with skipTo(int internalId) or next()
// Iterate over positions
for(int i = 0; i < currentTermPos.freq(); i++) {
int p = currentTermPos.nextPosition();
payloadBuffer = currentTermPos.getPayload(payloadBuffer, 0);
...
}
--
David Causse
Spotter
http://www.spotter.com/
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