Lucene3.5学习总结：
Lucene主要分为两大块：索引和搜索。相关包可能官网上下载。
官方网为：http://lucene.apache.org/core/old_versioned_docs/versions/3_5_0/index.html
索引分为文件索引和内存索引，下面介绍的是文件索引。包括新建、删除、更新、读取索引。索引中文分词可以研究下IKAnalyzer。
import java.io.File;
import java.io.IOException;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.NumericField;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
/**
?* 索引
?*
?* @author
?* @version v 0.1 2012-3-6 上午10:50:25
?*/
public class Index {
??? /** 索引文件路径 */
??? private static final String INDEX_PATH = "/workspace2/indexing";
???
??? /** 编号 */
??? public static final String AUCTION_NO = "auctionNo";
??? /** 名称 */
??? public static final String AUCTION_NAME = "auctionName";
??? /** 价格 */
??? public static final String MAX_PRICE = "maxPrice";
??? /** 日期 */
??? public static final String END_DATE = "endDate";
???
??? /**
??? ?* 程序入口
??? ?* @param args
??? ?*/
??? public static void main(String[] args) {
??? ??? createIndex();
//??? ??? deleteIndex();
//??? ??? readIndex();
??? ??? updateIndex();
??? }
??? /**
??? ?* 创建索引
??? ?*/
??? public static void createIndex(){
??? ??? try {
??? ??? ??? Directory directory = FSDirectory.open(new File(INDEX_PATH));
??? ??? ??? Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_35);
??? ??? ??? IndexWriterConfig iwConfig = new IndexWriterConfig(Version.LUCENE_35,analyzer);
??? ??? ??? IndexWriter writer = new IndexWriter(directory, iwConfig);
??? ??? ???
??? ??? ??? //Document添加索引值
??? ??? ??? Document doc = new Document();
??? ??? ??? Field auctionNoField = new Field(AUCTION_NO, "10003",Field.Store.YES, Field.Index.NOT_ANALYZED);
??? ??? ??? Field auctionNameField = new Field(AUCTION_NAME, "汇园果汁", Field.Store.YES, Field.Index.ANALYZED);
??? ??? ??? Field endDateField = new Field(END_DATE, "2012-03-06 18:00:00",Field.Store.YES, Field.Index.NOT_ANALYZED);
??? ??? ??? doc.add(auctionNoField);
??? ??? ??? doc.add(auctionNameField);
??? ??? ??? doc.add(new NumericField(Index.MAX_PRICE, Field.Store.YES, true).setDoubleValue(300));
??? ??? ??? doc.add(endDateField);
??? ??? ???
??? ??? ??? writer.addDocument(doc);
//??? ??? ??? writer.addDocuments(docs);//添加多个索引
??? ??? ??? writer.close();
??? ??? ??? System.out.println("=========创建索引完成");
??? ??? } catch (IOException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? }
???
??? /**
??? ?* IndexWriter方式删除索引
??? ?* <ul>
??? ?* ??? ??? <li>全部删除</li>
??? ?* ??? ??? <li>单个或多个删除</li>
??? ?* </ul>
??? ?*/
??? public static void indexWriterDeleteIndex(){
??? ??? try {
??? ??? ??? Directory directory = FSDirectory.open(new File(INDEX_PATH));
??? ??? ??? Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_35);
??? ??? ??? IndexWriterConfig iwConfig = new IndexWriterConfig(Version.LUCENE_35,analyzer);
??? ??? ??? IndexWriter writer = new IndexWriter(directory, iwConfig);
//??? ??? ??? writer.deleteAll();//删除所有索引
??? ??? ??? Term term = new Term(Index.AUCTION_NO, "10001");//删除单个索引
??? ??? ??? writer.deleteDocuments(term);
??? ??? ??? writer.close();
??? ??? ??? System.out.println("=========删除索引成功");
??? ??? } catch (IOException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? }
???
??? /**
??? ?* IndexReader方式删除索引
??? ?*/
??? public static void indexReaderDeleteIndex(){
??? ??? try {
??? ??? ??? Directory directory = FSDirectory.open(new File(INDEX_PATH));
??? ??? ??? IndexReader reader = IndexReader.open(directory, false);//设为true为只读模式
??? ??? ??? Term term = new Term(Index.AUCTION_NO, "10000");//删除单个索引
??? ??? ??? reader.deleteDocuments(term);
??? ??? ??? reader.flush();
??? ??? ??? reader.close();
??? ??? } catch (IOException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? }
???
??? /**
??? ?* 更新索引(先删除再创建)
??? ?* <ul>
??? ?* ??? ??? <li>更新单个索引</li>
??? ?* ??? ??? <li>更新多个索引</li>
??? ?* </ul>
??? ?*/
??? public static void updateIndex(){
??? ??? try {
??? ??? ??? Directory directory = FSDirectory.open(new File(INDEX_PATH));
??? ??? ??? Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_35);
??? ??? ??? IndexWriterConfig iwConfig = new IndexWriterConfig(Version.LUCENE_35,analyzer);
??? ??? ??? IndexWriter writer = new IndexWriter(directory, iwConfig);
??? ??? ???
??? ??? ??? //Document添加索引值
??? ??? ??? Document doc = new Document();
??? ??? ??? Field auctionNoField = new Field(AUCTION_NO, "10003",Field.Store.YES, Field.Index.NOT_ANALYZED);
??? ??? ??? Field auctionNameField = new Field(AUCTION_NAME, "商品名称", Field.Store.YES, Field.Index.ANALYZED);
??? ??? ??? Field endDateField = new Field(END_DATE, "2011-03-06 18:00:00",Field.Store.YES, Field.Index.NOT_ANALYZED);
??? ??? ??? doc.add(auctionNoField);
??? ??? ??? doc.add(auctionNameField);
??? ??? ??? doc.add(new NumericField(Index.MAX_PRICE, Field.Store.YES, true).setDoubleValue(200));
??? ??? ??? doc.add(endDateField);
??? ??? ???
??? ??? ??? //根据唯一商品ID进行更新索引
??? ??? ??? Term term = new Term(Index.AUCTION_NO,"10003");
??? ??? ??? writer.updateDocument(term, doc);//更新索引
//??? ??? ??? writer.updateDocuments(delTerm, docs);//更新多个索引
??? ??? ??? writer.close();
??? ??? ??? System.out.println("=========更新索引完成");
??? ??? } catch (IOException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? }
???
??? /**
??? ?* 读索引
??? ?*/
??? public static void readIndex(){
??? ??? try {
??? ??? ??? Directory directory = FSDirectory.open(new File(INDEX_PATH));
??? ??? ??? IndexReader reader = IndexReader.open(directory, true);//设为true为只读模式
??? ??? ??? int num = reader.numDocs();
??? ??? ??? for (int i = 0; i < num; i++) {
??? ??? ??? ??? Document doc = reader.document(i);
??? ??? ??? ??? System.out.println(doc);
??? ??? ??? }
??? ??? ??? reader.close();
??? ??? } catch (IOException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? }
}
?
Lucene查询有很多种，下面介绍了一些常用的查询
Lucene查询语法请参考：http://lucene.apache.org/core/old_versioned_docs/versions/3_5_0/queryparsersyntax.html
下面是搜索代码：
import java.io.File;
import java.io.IOException;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.MultiFieldQueryParser;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.MultiPhraseQuery;
import org.apache.lucene.search.NumericRangeQuery;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TermRangeQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.TopScoreDocCollector;
import org.apache.lucene.search.WildcardQuery;
import org.apache.lucene.search.highlight.Highlighter;
import org.apache.lucene.search.highlight.InvalidTokenOffsetsException;
import org.apache.lucene.search.highlight.QueryScorer;
import org.apache.lucene.search.highlight.SimpleFragmenter;
import org.apache.lucene.search.highlight.SimpleHTMLFormatter;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
import com.index.Index;
/**
?*
?*
?* @author
?* @version v 0.1 2012-3-6 下午01:33:16
?*/
public class Search {
??? public IndexSearcher searcher = null;
??? String keyword = "北 AND 要";
??? String keyword2 = "100";
???
??? /**
??? ?* 程序入口
??? ?* @param args
??? ?*/
??? public static void main(String[] args) {
??? ??? Search search =? new Search();
??? ??? search.getSearcher();
??? ???
//??? ??? search.termQuery();//词条查询
??? ??? search.booleanQuery_1();
//??? ??? search.booleanQuery();//组合查询
//??? ??? search.wildcardQuery();//通配符查询
//??? ??? search.phraseQuery();//短语查询
//??? ??? search.prefixQuery();//前缀查询
//??? ??? search.multiPhraseQuery();//多短语查询-
//??? ??? search.fuzzyQuery();//模糊查询
//??? ??? search.termRangeQuery();//文本范围查询 2011-03-06 18:00:00? TO 2012-03-06 18:00:00
//??? ??? search.numericRangeQuery(100.00,200.00);//数字范围查询
//??? ??? search.sortQuery();//排序查询
//??? ??? search.heightQuery();//高亮查询
//??? ??? search.pageQuery(2, 5);//分页查询
??? }
???
??? /**
??? ?* 获得搜索
??? ?*/
??? public? void getSearcher(){
??? ??? IndexReader reader = null;
??? ??? try {
??? ??? ??? reader = IndexReader.open(FSDirectory.open(new File("/workspace2/indexing")), true);
??? ??? ??? searcher = new IndexSearcher(reader);
??? ??? } catch (CorruptIndexException e) {
??? ??? ??? e.printStackTrace();
??? ??? } catch (IOException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? }
???
??? /**
??? ?* 查询
??? ?* @param q
??? ?*/
??? public void query(Query q){
??? ??? TopScoreDocCollector collector = TopScoreDocCollector.create(5*10, false);
??? ??? try {
??? ??? ??? searcher.search(q, collector);
??? ??? ??? int count = collector.getTotalHits();
??? ??? ??? System.out.println("------------获得 "+count+" 记录！");
??? ??? ??? TopDocs top = collector.topDocs();
??? ??? ??? ScoreDoc[] docs = top.scoreDocs;
??? ??? ??? for (ScoreDoc sd : docs) {
??? ??? ??? ??? Document doc = searcher.doc(sd.doc);
??? ??? ??? ??? System.out.println(doc.get(Index.AUCTION_NO)+" , "+doc.get(Index.AUCTION_NAME)+" , "+doc.get(Index.MAX_PRICE)+" , "+doc.get(Index.END_DATE));
??? ??? ??? }
??? ??? ??? searcher.close();//关闭搜索
??? ??? } catch (IOException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? }
???
??? /**
??? ?* 排序查询
??? ?* @param q
??? ?*/
??? public void querySort(Query q,Sort sort){
??? ??? System.out.println("==============排序搜索");
??? ??? TopScoreDocCollector collector = TopScoreDocCollector.create(5*10, false);
??? ??? try {
??? ??? ??? ?searcher.search(q,1000, sort);
??? ??? ??? int count = collector.getTotalHits();
??? ??? ??? System.out.println("------------获得 "+count+" 记录！");
??? ??? ??? TopDocs top = collector.topDocs();
??? ??? ??? ScoreDoc[] docs = top.scoreDocs;
??? ??? ??? for (ScoreDoc sd : docs) {
??? ??? ??? ??? Document doc = searcher.doc(sd.doc);
??? ??? ??? ??? System.out.println(doc.get(Index.AUCTION_NO)+" , "+doc.get(Index.AUCTION_NAME)+" , "+doc.get(Index.MAX_PRICE)+" , "+doc.get(Index.END_DATE));
??? ??? ??? }
??? ??? ??? searcher.close();
??? ??? } catch (IOException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? ???
??? }
???
??? /**
??? ?* 词条搜索 TermQuery
??? ?*/
??? public void termQuery(){
??? ??? Term t = new Term(Index.AUCTION_NAME, keyword);
??? ??? TermQuery q = new TermQuery(t);
??? ??? System.out.println("=====词条搜索=====");
??? ??? query(q);
??? }
???
??? /**
??? ?* MultiTermQuery
??? ?*/
??? public void multiTermQuery(){
??? ???
??? }
??? public void booleanQuery_1() {
??? ??? BooleanQuery q = new BooleanQuery();
??? ??? QueryParser parser = new QueryParser(Version.LUCENE_35, Index.AUCTION_NAME, new StandardAnalyzer(Version.LUCENE_35));
??? ??? try {
??? ??? ??? Query query = parser.parse(keyword);
??? ??? ??? TermQuery termQuery = new TermQuery(new Term(Index.AUCTION_NAME,
??? ??? ??? ??? ??? keyword));
??? ??? ??? q.add(query, BooleanClause.Occur.SHOULD);
??? ??? ??? System.out.println("q : " + q.toString());
??? ??? ??? System.out.println("========= 组合搜索");
??? ??? ??? query(q);
??? ??? } catch (ParseException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? ???
??? }
???
??? /**
??? ?* 组合搜索 BooleanQuery
??? ?* MUST_NOT :不包含
??? ?* SHOULD ：表或关系
??? ?* MUST ：表并关系
??? ?*/
??? public void booleanQuery(){
??? ??? BooleanQuery q = new BooleanQuery();
??? ??? String[] s = keyword.split(" ");
??? ??? if (s.length > 0) {
??? ??? ??? for (int i = 0; i < s.length; i++) {
//??? ??? ??? ??? TermQuery termQuery = new TermQuery(new Term(Index.AUCTION_NAME,s[i]));
??? ??? ??? ??? if (s[i].indexOf("-") != -1) {
??? ??? ??? ??? ??? String query = s[i].replaceAll("-", " NOT ");
??? ??? ??? ??? ??? TermQuery termQuery = new TermQuery(new Term(Index.AUCTION_NAME,query));
??? ??? ??? ??? ??? q.add(termQuery,BooleanClause.Occur.MUST_NOT);
??? ??? ??? ??? }else{
??? ??? ??? ??? ??? TermQuery termQuery = new TermQuery(new Term(Index.AUCTION_NAME,s[i]));
??? ??? ??? ??? ??? q.add(termQuery, BooleanClause.Occur.SHOULD);
??? ??? ??? ??? }
??? ??? ??? }
??? ??? }else{
??? ??? ??? TermQuery termQuery = new TermQuery(new Term(Index.AUCTION_NAME,keyword));
??? ??? ??? q.add(termQuery,BooleanClause.Occur.SHOULD);
??? ??? }
??? ??? System.out.println("q : "+q.toString());
??? ??? System.out.println("========= 组合搜索");
??? ??? query(q);
??? }
???
??? /**
??? ?*
??? ?* 通配符搜索 WildcardQuery
??? ?* ?*
??? ?*/
??? public void wildcardQuery(){
??? ??? Term t = new Term(Index.AUCTION_NAME, keyword);
??? ??? WildcardQuery q = new WildcardQuery(t);
??? ??? System.out.println(q.toString());
??? ??? System.out.println("=======通配符搜索");
??? ??? query(q);
??? }
???
??? /**
??? ?* 短语搜索 PhraseQuery
??? ?*/
??? public void phraseQuery(){
??? ??? PhraseQuery q = new PhraseQuery();
??? ??? q.add(new Term(Index.AUCTION_NAME,keyword));
??? ??? q.add(new Term(Index.AUCTION_NAME, keyword2));
??? ??? q.setSlop(10);//设置坡度，默认为0。两个关键字之间的字符数量
??? ??? System.out.println("=======短语搜索");
??? ??? query(q);
??? }
???
??? /**
??? ?* 前缀搜索 PrefixQuery
??? ?*/
??? public void prefixQuery(){
??? ??? Term term = new Term(Index.AUCTION_NAME, keyword);
??? ??? PrefixQuery q = new PrefixQuery(term);
??? ??? System.out.println("==========前缀搜索");
??? ??? query(q);
??? }
???
??? /**
??? ?* 多短语搜索 MultiPhraseQuery
??? ?*/
??? public void multiPhraseQuery(){
??? ??? Term[] terms = new Term[]{new Term(Index.AUCTION_NAME, keyword),new Term(Index.AUCTION_NAME,keyword2)};
??? ??? MultiPhraseQuery q = new MultiPhraseQuery();
??? ??? q.add(terms);
??? ??? q.setSlop(0);//设置坡度，默认为0。两个关键字之间的字符数量
??? ??? System.out.println("==========多短语搜索");
??? ??? query(q);
??? }
???
??? /**
??? ?* 模糊搜索 FuzzyQuery
??? ?*/
??? public void fuzzyQuery(){
??? ??? Term term = new Term(Index.AUCTION_NAME, keyword);
??? ??? FuzzyQuery q = new FuzzyQuery(term);
??? ??? //默认匹配度为0.5,当该值越小，模糊匹配度越低
//??? ??? FuzzyQuery q = new FuzzyQuery(term, 0.1f);
??? ??? System.out.println("q："+q.toString());
??? ??? System.out.println("=======模糊搜索");
??? ??? query(q);
??? }
???
??? /**
??? ?* 文本范围搜索 TermRangeQuery
??? ?* 后面两个参数分别为是否包含前边界和后边界
??? ?*/
??? public void termRangeQuery(){
??? ??? TermRangeQuery q??? = new TermRangeQuery(Index.END_DATE, keyword, keyword2, true, false);
??? ??? System.out.println("===========范围搜索");
??? ??? query(q);
??? }
???
??? /**
??? ?* 数字范围搜索 NumericRangeQuery
??? ?* 后面两个参数分别为是否包含前边界和后边界
??? ?*/
??? public void numericRangeQuery(double start,double end){
??? ??? Query q = NumericRangeQuery.newDoubleRange(Index.MAX_PRICE, start, end, true, true);
??? ??? System.out.println("===========数字范围搜索");
??? ??? query(q);
??? }
???
??? /**
??? ?* 跨度查询 SpanQuery
??? ?*/
??? public void spanQuery(){
??? ???
??? }
???
??? /**
??? ?* 排序搜索(根据拍品名称按价格排序)
??? ?*/
??? public void sortQuery(){
??? ??? try {
??? ??? ??? QueryParser parser = new MultiFieldQueryParser(Version.LUCENE_35, new String[]{Index.AUCTION_NAME}, new StandardAnalyzer(Version.LUCENE_35));
??? ??? ??? Query q = parser.parse(keyword);
??? ??? ??? Sort sort = new Sort();
??? ??? ??? sort.setSort(new SortField(Index.MAX_PRICE, SortField.DOUBLE, false));//true为降序，false为升序
??? ??? ??? ScoreDoc[] hits = searcher.search(q, null, Integer.MAX_VALUE, sort).scoreDocs;
??? ??? ??? System.out.println(hits.length);
??? ??? ??? for (int i = 0; i < hits.length; i++) {
??? ??? ??? ??? Document doc? = searcher.doc(hits[i].doc);
??? ??? ??? ??? System.out.println(doc.get(Index.AUCTION_NAME)+" , "+doc.get(Index.MAX_PRICE));
??? ??? ??? }
??? ??? ??? searcher.close();
??? ??? } catch (ParseException e) {
??? ??? ??? e.printStackTrace();
??? ??? } catch (IOException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? ???
??? ???
??? }
???
??? /**
??? ?* 高亮显示搜索
??? ?* Lucene高亮与solr高亮有些不一样，Lucene是先查询出结果再设置高亮，
??? ?* 而solr是先设置高亮再查询，直接得到高亮内容
??? ?*/
??? public void heightQuery(){
??? ??? Term t = new Term(Index.AUCTION_NAME, keyword);
??? ??? TermQuery q = new TermQuery(t);
??? ??? TopScoreDocCollector collector = TopScoreDocCollector.create(5*10, false);
??? ??? try {
??? ??? ??? searcher.search(q, collector);
??? ??? ??? int count = collector.getTotalHits();
??? ??? ??? System.out.println("------------获得 "+count+" 记录！");
??? ??? ??? TopDocs top = collector.topDocs();
??? ??? ??? ScoreDoc[] docs = top.scoreDocs;
??? ??? ??? for (ScoreDoc sd : docs) {
??? ??? ??? ??? Document doc = searcher.doc(sd.doc);
??? ??? ??? ??? String auctionName = doc.get(Index.AUCTION_NAME);
??? ??? ??? ??? SimpleHTMLFormatter shf = new SimpleHTMLFormatter("<span style='color:red'>", "</span>");
??? ??? ??? ??? Highlighter highlighter = new Highlighter(shf, new QueryScorer(q));
??? ??? ??? ??? highlighter.setTextFragmenter(new SimpleFragmenter(Integer.MAX_VALUE));
??? ??? ??? ??? String content = highlighter.getBestFragment(new StandardAnalyzer(Version.LUCENE_35), Index.AUCTION_NAME, auctionName);
??? ??? ??? ??? System.out.println(doc.get(Index.AUCTION_NO)+" , "+content+" , "+doc.get(Index.MAX_PRICE)+" , "+doc.get(Index.END_DATE));
??? ??? ??? }
??? ??? } catch (IOException e) {
??? ??? ??? e.printStackTrace();
??? ??? } catch (InvalidTokenOffsetsException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? }
???
??? /**
??? ?* 分页查询
??? ?*
??? ?* @param start
??? ?* @param howMany
??? ?*/
??? public void pageQuery(int start, int howMany){
??? ??? Term t = new Term(Index.AUCTION_NAME, keyword);
??? ??? TermQuery q = new TermQuery(t);
??? ??? System.out.println("=============分页搜索");
??? ??? this.doPageSearch(q, start, howMany);
??? }
???
??? /**
??? ?* 分页
??? ?*
??? ?*/
??? public void doPageSearch(Query q, int start, int howMany){
??? ??? TopScoreDocCollector collector = TopScoreDocCollector.create(start+howMany, false);
??? ??? try {
??? ??? ??? searcher.search(q, collector);
??? ??? ??? int count = collector.getTotalHits();
??? ??? ??? System.out.println("------------获得 "+count+" 记录！");
??? ??? ??? TopDocs top = collector.topDocs(start, howMany);
??? ??? ??? ScoreDoc[] docs = top.scoreDocs;
??? ??? ??? for (ScoreDoc sd : docs) {
??? ??? ??? ??? Document doc = searcher.doc(sd.doc);
??? ??? ??? ??? System.out.println(doc.get(Index.AUCTION_NO)+","+doc.get(Index.AUCTION_NAME));
??? ??? ??? }
??? ??? } catch (IOException e) {
??? ??? ??? e.printStackTrace();
??? ??? }
??? }
}
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