multifilter.java

一个用jsp技术实现的新闻发布系统

package net.ijsp.news.search;

/**
*  搜索
*  @author: ccjsmile
*  Company: http://www.ijsp.net
*  Copyright: Copyright (c) 2003
*  @version 1.0 beta
*/

import java.util.*;
import java.io.IOException;

import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermDocs;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.Filter;


public class MultiFilter extends org.apache.lucene.search.Filter {

    private List filterList;

    public MultiFilter() {
        filterList = new ArrayList();
    }

    public MultiFilter(int initialCapacity) {
        filterList = new ArrayList(initialCapacity);
    }

    public void add(Filter filter) {
        filterList.add(filter);
    }

    public BitSet bits(IndexReader reader) throws IOException {

        int filterListSize = filterList.size();
        if (filterListSize > 0) {
            BitSet bits = ((Filter)filterList.get(0)).bits(reader);
            for (int i=1; i<filterListSize; i++) {
                bits.and( ((Filter)filterList.get(i)).bits(reader) );
            }
            return bits;
        }else {
            return new BitSet(reader.maxDoc());
        }
    }
}