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comparison lucene/src/luan/modules/lucene/LuceneSearcher.java @ 257:c5c60eca33dd

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allow Lucene search for 0 rows git-svn-id: https://luan-java.googlecode.com/svn/trunk@258 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 28 Oct 2014 03:05:37 +0000
parents b25feac318d8
children 8afe9f2fdfec
comparison
equal deleted inserted replaced
256:15122d724ce4 257:c5c60eca33dd
14 import org.apache.lucene.search.SortField; 14 import org.apache.lucene.search.SortField;
15 import org.apache.lucene.search.ScoreDoc; 15 import org.apache.lucene.search.ScoreDoc;
16 import org.apache.lucene.search.TermQuery; 16 import org.apache.lucene.search.TermQuery;
17 import org.apache.lucene.search.BooleanQuery; 17 import org.apache.lucene.search.BooleanQuery;
18 import org.apache.lucene.search.BooleanClause; 18 import org.apache.lucene.search.BooleanClause;
19 import org.apache.lucene.search.TotalHitCountCollector;
19 import luan.Luan; 20 import luan.Luan;
20 import luan.LuanState; 21 import luan.LuanState;
21 import luan.LuanTable; 22 import luan.LuanTable;
22 import luan.LuanFunction; 23 import luan.LuanFunction;
23 import luan.LuanJavaFunction; 24 import luan.LuanJavaFunction;
157 flds[i] = sortField(luan,fldTbl.asList()," at position "+(i+1)); 158 flds[i] = sortField(luan,fldTbl.asList()," at position "+(i+1));
158 } 159 }
159 return new Sort(flds); 160 return new Sort(flds);
160 } 161 }
161 162
163 private static final LuanFunction nothingFn = new LuanFunction() {
164 @Override public Object call(LuanState luan,Object[] args) {
165 return LuanFunction.NOTHING;
166 }
167 };
168
162 public Object[] search( LuanState luan, LuanTable queryTbl, int n, LuanTable sortTbl ) throws LuanException, IOException { 169 public Object[] search( LuanState luan, LuanTable queryTbl, int n, LuanTable sortTbl ) throws LuanException, IOException {
163 Query query = query(queryTbl); 170 Query query = query(queryTbl);
164 if( query == null ) 171 if( query == null )
165 throw luan.exception("invalid query"); 172 throw luan.exception("invalid query");
173 if( n==0 ) {
174 TotalHitCountCollector thcc = new TotalHitCountCollector();
175 searcher.search(query,thcc);
176 return new Object[]{ nothingFn, 0, thcc.getTotalHits() };
177 }
166 TopDocs td = sortTbl==null ? searcher.search(query,n) : searcher.search(query,n,sort(luan,sortTbl)); 178 TopDocs td = sortTbl==null ? searcher.search(query,n) : searcher.search(query,n,sort(luan,sortTbl));
167 final ScoreDoc[] scoreDocs = td.scoreDocs; 179 final ScoreDoc[] scoreDocs = td.scoreDocs;
168 LuanFunction results = new LuanFunction() { 180 LuanFunction results = new LuanFunction() {
169 int i = 0; 181 int i = 0;
170 182