4.5.7. Retrieving an Analyzer
Retrieving an analyzer can be used when multiple analyzers have been used in a domain model, in order to benefit from stemming or phonetic approximation, etc. In this case, use the same analyzers to building a query. Alternatively, use the Lucene-based Query API, which selects the correct analyzer automatically. See Section 5.1.2, “Building a Lucene Query”.
The scoped analyzer for a given entity can be retrieved using either the Lucene programmatic API or the Lucene query parser. A scoped analyzer applies the right analyzers depending on the field indexed. Multiple analyzers can be defined on a given entity, each working on an individual field. A scoped analyzer unifies these analyzers into a context-aware analyzer.
In the following example, the song title is indexed in two fields:
Using the analyzer provided by the search factory, the query uses the appropriate analyzer depending on the field targeted.
- Standard analyzer: used in the
titlefield. - Stemming analyzer: used in the
title_stemmedfield.
Example 4.12. Using the scoped analyzer when building a full-text query
SearchManager manager = Search.getSearchManager(cache);
org.apache.lucene.queryParser.QueryParser parser = new QueryParser(
org.apache.lucene.util.Version.LUCENE_36,
"title",
manager.getSearchFactory().getAnalyzer(Song.class)
);
org.apache.lucene.search.Query luceneQuery =
parser.parse("title:sky Or title_stemmed:diamond");
// wrap Lucene query in a org.infinispan.query.CacheQuery
CacheQuery cacheQuery = manager.getQuery(luceneQuery, Song.class);
List result = cacheQuery.list();
//return the list of matching objectsNote
Analyzers defined via
@AnalyzerDef can also be retrieved by their definition name using searchFactory.getAnalyzer(String).
