package chapter7;

import java.io.IOException;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Sort;
import org.apache.lucene.store.RAMDirectory;

public class SortRelavence {
	static String[] ContentList = { "Lucene 使用 方便", "使用 Lucene","Lucene 功能 強(qiáng)大", "Lucene 開放 源碼" };
	
	public static void main(String[] args) throws IOException{
		searchIndex();
	}
	// 創(chuàng)建索引并通過Sort改變檢索結(jié)果排序
	private static void searchIndex() throws IOException{   
		try{
			RAMDirectory ramdirectory = new RAMDirectory(); // 內(nèi)存目錄
			IndexWriter writer = new IndexWriter(ramdirectory,new StandardAnalyzer(),true);
			for (int i = 0; i < ContentList.length; i++)
		    {
		        Document document = new Document(); // 創(chuàng)建文檔對(duì)象
		        // 創(chuàng)建域?qū)ο?		        Field fieldContent = new Field("Content", ContentList[i], Field.Store.YES, Field.Index.TOKENIZED);

		        document.add(fieldContent);         // 添加創(chuàng)建的文本域到當(dāng)前文檔

		        writer.addDocument(document);       // 完成的文檔添加到索引
		    }
			writer.close();                         // 關(guān)閉索引
		    IndexSearcher searcher = new IndexSearcher(ramdirectory);               // 創(chuàng)建檢索器
		    QueryParser parser = new QueryParser("Content",new StandardAnalyzer()); // 創(chuàng)建查詢分析器
		    Query  query = parser.parse("Lucene");    // 生成查詢對(duì)象

		    Hits rstDoc;
		    System.out.println("Lucene默認(rèn)相關(guān)性排序");
		    System.out.println("-----------------------------------");		    
		    rstDoc = searcher.search(query);     				// Lucene默認(rèn)相關(guān)性排序
		    for (int i = 0; i < rstDoc.length(); i++) 			// 遍歷獲取文檔，并讀取相關(guān)參數(shù)
		    {
		        Document doc = rstDoc.doc(i);
		        System.out.println(doc.get("Content") + " Boost: " + doc.getBoost() + ", score : " + rstDoc.score(i));
		    }
		    System.out.println("");
		    System.out.println("Sort靜態(tài)常量實(shí)現(xiàn)相關(guān)性排序");
		    System.out.println("-----------------------------------");			    
		    rstDoc = searcher.search(query,Sort.RELEVANCE);     // Sort靜態(tài)常量實(shí)現(xiàn)相關(guān)性排序
		    for (int i = 0; i < rstDoc.length(); i++) 			// 遍歷獲取文檔，并讀取相關(guān)參數(shù)
		    {
		        Document doc = rstDoc.doc(i);
		        System.out.println( doc.get("Content") + " Boost: " + doc.getBoost() + ", score : " + rstDoc.score(i));
		    }
		    System.out.println("");		    
		    System.out.println("Sort默認(rèn)構(gòu)造函數(shù)實(shí)現(xiàn)相關(guān)性排序");
		    System.out.println("-----------------------------------");			    
		    rstDoc = searcher.search(query,new Sort());     	// Sort默認(rèn)構(gòu)造函數(shù)實(shí)現(xiàn)相關(guān)性排序
		    for (int i = 0; i < rstDoc.length(); i++) 			// 遍歷獲取文檔，并讀取相關(guān)參數(shù)
		    {
		        Document doc = rstDoc.doc(i);
		        System.out.println( doc.get("Content") + " Boost: " + doc.getBoost() + ", score : " + rstDoc.score(i));
		    }		   
		    
		    searcher.close();	
		} catch(ParseException e){
			System.out.println("ParseException ");
		} catch(IOException e){
			System.out.println("IOException  ");			
		}
	}
}