www.pudn.com > 200402121144312230.rar > DbQuery.java

package net.ijsp.news.search.database;

/**
 * 
Title: 
 * 
Description: 
 * 
Copyright: Copyright (c) 2003
 * 
Company: ijsp.net
 * @author ccjsmile
 * @version 1.0
 */

import java.util.Iterator;
import java.util.ArrayList;
import java.io.*;
import net.ijsp.news.search.MultiFilter;
import net.ijsp.news.search.FieldFilter;
import net.ijsp.news.search.Query;
import net.ijsp.news.database.*;
import net.ijsp.news.news.*;

import org.apache.lucene.analysis.*;
import org.apache.lucene.analysis.standard.*;
import org.apache.lucene.document.*;
import org.apache.lucene.store.*;
import org.apache.lucene.search.*;
import org.apache.lucene.queryParser.*;
import org.apache.lucene.index.*;

public class DbQuery implements Query {

        private String queryString ;		// 关键字
        private ArrayList results = null;	// 查询结果，新闻文件名
    private static String indexPath = null;
        private static Searcher searcher;
        private static Directory searchDirectory = null;
        private static IndexReader reader;
        private static long indexLastModified;
        private int classID = 0;

    public String getQueryString() {
                return queryString;
        }

    public void setQueryString(String queryString) {
                this.queryString = queryString;
                results = null;
        }

        /**
        * @return 符合条件的记录数
        */
    public int resultCount() {
                 if (results == null) {
            executeQuery();
        }
                return results.size();
        }

        /**
        * @return 符合条件的新闻
        */
    public Iterator results() {
                if(results == null) {
                        executeQuery();
                }
                return results.iterator();
        }

        /**
        * @return 符合条件的新闻(分页)
        */
    public Iterator results(int startIndex, int numResults) {
                if(results == null) {
                        executeQuery();
                }

                int endIndex = startIndex + numResults - 1 ;
        if (endIndex > results.size() - 1) {
            endIndex = results.size() - 1;
        }
                ArrayList newArrayList = new ArrayList();
                for(int i=startIndex; i 0) {
                hits = searcher.search(comboQuery, multiFilter);
            } else {
                                hits = searcher.search(comboQuery);
            }

                        int numResults = hits.length() ;

                        results = new ArrayList();
                        Factory factory  = Factory.getInstance();
            for (int i=0; i