Mercurial Hosting > luan
view lucene/src/luan/modules/lucene/LuceneSearcher.java @ 291:a35d1177bbf0
implement Ab_testing.web_page()
git-svn-id: https://luan-java.googlecode.com/svn/trunk@292 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 09 Dec 2014 23:24:07 +0000 |
parents | 4d53e9fc1bd9 |
children | 899253043270 |
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package luan.modules.lucene; import java.io.IOException; import java.util.NoSuchElementException; import java.util.Map; import java.util.List; import org.apache.lucene.index.IndexReader; import org.apache.lucene.index.Term; import org.apache.lucene.search.IndexSearcher; import org.apache.lucene.search.Query; import org.apache.lucene.search.TopDocs; import org.apache.lucene.search.TopFieldDocs; import org.apache.lucene.search.Sort; import org.apache.lucene.search.SortField; import org.apache.lucene.search.ScoreDoc; import org.apache.lucene.search.TermQuery; import org.apache.lucene.search.BooleanQuery; import org.apache.lucene.search.BooleanClause; import org.apache.lucene.search.Collector; import org.apache.lucene.search.TotalHitCountCollector; import org.apache.lucene.search.Scorer; import org.apache.lucene.search.MatchAllDocsQuery; import org.apache.lucene.index.AtomicReaderContext; import luan.Luan; import luan.LuanState; import luan.LuanTable; import luan.LuanFunction; import luan.LuanJavaFunction; import luan.LuanException; import luan.LuanRuntimeException; public final class LuceneSearcher { private final LuceneIndex index; private final IndexSearcher searcher; LuceneSearcher(LuceneIndex index,IndexReader reader) { this.index = index; this.searcher = new IndexSearcher(reader); } // call in finally block void close() throws IOException { searcher.getIndexReader().decRef(); } LuanTable doc(LuanState luan,int docID) throws LuanException, IOException { return index.toTable(luan,searcher.doc(docID)); } TopDocs search(Query query,int n) throws IOException { return searcher.search(query,n); } TopFieldDocs search(Query query,int n,Sort sort) throws IOException { return searcher.search(query,n,sort); } // luan private static final LuanFunction nothingFn = new LuanFunction() { @Override public Object call(LuanState luan,Object[] args) { return LuanFunction.NOTHING; } }; private static abstract class MyCollector extends Collector { int docBase; @Override public void setScorer(Scorer scorer) {} @Override public void setNextReader(AtomicReaderContext context) { this.docBase = context.docBase; } @Override public boolean acceptsDocsOutOfOrder() { return true; } } public Object[] search( final LuanState luan, Query query, Object nObj, Sort sort ) throws LuanException, IOException { if( nObj instanceof LuanFunction ) { final LuanFunction fn = (LuanFunction)nObj; Collector col = new MyCollector() { @Override public void collect(int doc) { try { LuanTable docTbl = doc(luan,docBase+doc); luan.call(fn,new Object[]{docTbl}); } catch(LuanException e) { throw new LuanRuntimeException(e); } catch(IOException e) { throw new LuanRuntimeException(luan.exception(e)); } } }; try { searcher.search(query,col); } catch(LuanRuntimeException e) { throw (LuanException)e.getCause(); } return LuanFunction.NOTHING; } Integer nI = Luan.asInteger(nObj); if( nI == null ) throw luan.exception("bad argument #2 (integer or function expected, got "+Luan.type(nObj)+")"); int n = nI; if( n==0 ) { TotalHitCountCollector thcc = new TotalHitCountCollector(); searcher.search(query,thcc); return new Object[]{ nothingFn, 0, thcc.getTotalHits() }; } TopDocs td = sort==null ? searcher.search(query,n) : searcher.search(query,n,sort); final ScoreDoc[] scoreDocs = td.scoreDocs; LuanFunction results = new LuanFunction() { int i = 0; @Override public Object call(LuanState luan,Object[] args) throws LuanException { if( i >= scoreDocs.length ) return LuanFunction.NOTHING; try { LuanTable doc = doc(luan,scoreDocs[i++].doc); return doc; } catch(IOException e) { throw luan.exception(e); } } }; return new Object[]{ results, scoreDocs.length, td.totalHits }; } private void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException { t.put( method, new LuanJavaFunction(LuceneSearcher.class.getMethod(method,parameterTypes),this) ); } LuanTable table() { LuanTable tbl = Luan.newTable(); try { add( tbl, "search", LuanState.class, Query.class, Object.class, Sort.class ); } catch(NoSuchMethodException e) { throw new RuntimeException(e); } return tbl; } }