--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lucene/src/luan/modules/lucene/LuceneSearcher.java	Tue Sep 30 20:03:56 2014 +0000
@@ -0,0 +1,85 @@
+package luan.modules.lucene;
+
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.document.Document;
+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.ScoreDoc;
+import luan.LuanTable;
+
+
+public final class LuceneSearcher {
+	private final IndexSearcher searcher;
+
+	LuceneSearcher(IndexReader reader) {
+		this.searcher = new IndexSearcher(reader);
+	}
+
+	// call in finally block
+	public void close() {
+		try {
+			searcher.getIndexReader().decRef();
+		} catch(IOException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	private Document rawDoc(int docID) {
+		try {
+			return searcher.doc(docID);
+		} catch(IOException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	public LuanTable doc(int docID) {
+		return LuceneDocument.toTable(rawDoc(docID));
+	}
+
+	public TopDocs search(Query query,int n) {
+		try {
+			return searcher.search(query,n);
+		} catch(IOException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	public TopFieldDocs search(Query query,int n,Sort sort) {
+		try {
+			return searcher.search(query,n,sort);
+		} catch(IOException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	public Iterable<LuanTable> docs(TopDocs td) {
+		final ScoreDoc[] scoreDocs = td.scoreDocs;
+		return new Iterable<LuanTable>() {
+			public Iterator<LuanTable> iterator() {
+				return new Iterator<LuanTable>() {
+					private int i = 0;
+
+					public boolean hasNext() {
+						return i < scoreDocs.length;
+					}
+
+					public LuanTable next() {
+						if( !hasNext() )
+							throw new NoSuchElementException();
+						return doc(scoreDocs[i++].doc);
+					}
+
+					public void remove() {
+						throw new UnsupportedOperationException();
+					}
+				};
+			}
+		};
+	}
+}