Lucene BooleanQuery 嵌套使用

public long getSearchCount(String keyword, String webFlag) {    TopScoreDocCollector f = TopScoreDocCollector.create(5000, false);    IndexSearcher isearcher = getSearcher();    Analyzer analyzer = null;    QueryParser queryParser = null;    Query query;    try {        if (!"website".equals(webFlag)) {            // 在索引目录中查询的字段            String[] fields = { "BOOK_NAME", "BOOK_DES", "BOOK_PEN_NAME", "BOOK_STATUS" };            List list = new ArrayList();            analyzer = getAnalyzer();            queryParser = new MultiFieldQueryParser(version, fields, analyzer);            query = queryParser.parse(keyword);        } else {            query = new BooleanQuery();            BooleanQuery bquery1 = new BooleanQuery();            TermQuery tQuery1 = new TermQuery(new Term("BOOK_NAME", keyword));            TermQuery tQuery2 = new TermQuery(new Term("BOOK_DES", keyword));            TermQuery tQuery3 = new TermQuery(new Term("BOOK_PEN_NAME", keyword));            TermQuery tQuery4 = new TermQuery(new Term("BOOK_STATUS", "12"));            TermQuery tQuery5 = new TermQuery(new Term("BOOK_ONSALE_IDE", "true"));            bquery1.add(tQuery1, BooleanClause.Occur.SHOULD);            bquery1.add(tQuery2, BooleanClause.Occur.SHOULD);            bquery1.add(tQuery3, BooleanClause.Occur.SHOULD);            //查询条件通过BooleanQuery 嵌套使用。。            ((BooleanQuery) query).add(bquery1, BooleanClause.Occur.MUST);**重点内容**            ((BooleanQuery) query).add(tQuery4, BooleanClause.Occur.MUST);            ((BooleanQuery) query).add(tQuery5, BooleanClause.Occur.MUST);        }        isearcher.search(query, f);    } catch (Exception e) {        e.printStackTrace();    }    TopDocs topDocs = f.topDocs(0, 5000);    ScoreDoc[] hits = topDocs.scoreDocs;    return hits.length;}**重点内容**