Hi Lucene Users,
I would like to catch BooleanQuery.TooManyClauses exception for certain
wildcard searches and display a 'subset' of results. I have used the
WildcardTermEnum to give me the first X documents matching the wildcard
query. Below is the code I use to implement the solution.
Without any performance concerns is this the best solution?
Or should I just tell the user to refine their query!?
Thanks
Ben
===== QueryParserTest.java ================================================
...
public class QueryParserTest extends LuceneTestCase {
...
private static int MAX_HITS = 10;
public void testCatchTooManyClauses() throws Exception {
reader = IndexReader.open(directory);
String queryStr = "9*";
String field = "PART_NBR";
Hits hits = null;
Vector docList;
try {
System.out.println("query: " + queryStr);
System.out.println("field: " + field);
hits =
searcher.search(parser.parse(field+":"+queryStr));
docList = new Vector(hits.length());
Iterator docListIt = hits.iterator();
while(docListIt.hasNext())
docList.add(((Hit)docListIt.next()).getDocument());
}
catch(BooleanQuery.TooManyClauses ex) {
System.out.println("catch
BooleanQuery.TooManyClauses, refining query");
Term term = new Term(field, queryStr);
WildcardTermEnum wte = new WildcardTermEnum(reader,
term);
int cnt = 0;
docList = new Vector(MAX_HITS);
while(wte.next() && cnt++ < MAX_HITS) {
term = wte.term();
TermQuery query = new TermQuery(new
Term(field, term.text()));
System.out.println("search for " +
query.getTerm().text());
hits = searcher.search(query);
Iterator docListIt = hits.iterator();
while(docListIt.hasNext())
docList.add(((Hit)docListIt.next()).getDocument());
}
}
System.out.println("found:" + docList.size());
}
...
===== QueryParserTest.java ================================================
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