Paul Taylor wrote:
I think this is a common problem, but don't know the correct solution.
Users were doing queries on a numeric field such as qdur:[73 TO 117]
and expecting to find all the values within but this fails because
lucene treats the numbers as strings and just does alphabetical
search. So I now index the field using
NumberTools.longToString() so allows equivalent search i.e.
qdur:[00000000000021 TO 00000000000039] which works correctly.
Trouble user types query into a free text field and cannot expect user
to do the conversion, so I need to convert qdur:[73 TO 117] to
qdur:[00000000000021 TO 00000000000039] before doing the lucene
search, Im trying to do this with regular expressions but not
convinced its safe for all variations, is there a better way (Im using
Lucene 2.9)?
Paul
And this is my code:
public class TrackMangler implements QueryMangler{
private Pattern matchDur;
private Pattern matchDurrRange;
public TrackMangler()
{
matchDur = Pattern.compile("(dur:)([0-9]+)");
matchDurRange = Pattern.compile("(dur:\\[)([0-9]+)( TO
)([0-9]+)(\\])");
}
private String convertDurToOrderable(String query)
{
Matcher m = matchDur.matcher(query);
StringBuffer sb = new StringBuffer();
while (m.find()) {
int duration = Integer.parseInt(m.group(2));
m.appendReplacement(sb, m.group(1) +
NumberTools.longToString(duration));
}
m.appendTail(sb);
query = sb.toString();
m = matchDurRange.matcher(query);
sb = new StringBuffer();
while (m.find()) {
int firstTrackNo = Integer.parseInt(m.group(2));
int secondTrackNo = Integer.parseInt(m.group(4));
m.appendReplacement(sb, m.group(1)
+ NumberTools.longToString(firstTrackNo)
+ m.group(3)
+ NumberTools.longToString(secondTrackNo)
+ m.group(5));
}
m.appendTail(sb);
return sb.toString();
}
}
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