org.cdlib.xtf.textEngine
Class PluralFoldingRewriter
Object
QueryRewriter
XtfQueryRewriter
PluralFoldingRewriter
public class PluralFoldingRewriter
- extends XtfQueryRewriter
Rewrites a Lucene query to replace all plural words with their singular
equivalents.
- Author:
- Martin Haye
Method Summary |
protected Query |
rewrite(SpanTermQuery q)
Rewrite a span term query. |
protected Query |
rewrite(TermQuery q)
Rewrite a term query. |
Methods inherited from class QueryRewriter |
combineBoost, copyBoost, copyBoost, forceRewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewriteClauses |
Methods inherited from class Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
pluralMap
private WordMap pluralMap
tokenizedFields
private Set tokenizedFields
PluralFoldingRewriter
public PluralFoldingRewriter(WordMap pluralMap,
Set tokFields)
- Construct a new rewriter to use the given map
rewrite
protected Query rewrite(TermQuery q)
- Rewrite a term query. This is only called for artificial queries
introduced by XTF system itself, and therefore we don't map here.
- Overrides:
rewrite
in class QueryRewriter
- Parameters:
q
- The query to rewrite
- Returns:
- Rewritten version, or 'q' unchanged if no changed needed.
rewrite
protected Query rewrite(SpanTermQuery q)
- Rewrite a span term query. Maps plural words to singular, but only
for tokenized fields.
- Overrides:
rewrite
in class QueryRewriter
- Parameters:
q
- The query to rewrite
- Returns:
- Rewritten version, or 'q' unchanged if no changed needed.