lucene-链式过滤器ChainedFliter

1、使用ChainedFilter将其它过滤器链接起来，在过滤器中执行AND、OR、XOR和ANDNOT的位操作。

2、ChianedFilter没有缓存，只要把它封装进CachingWrappingFilter就可以提供对过滤器结果的缓存操作。

3、

public class ChainedFilterTest extends TestCase{

public static final intMAX=500;

private RAMDirectorydirectory;

private IndexSearchersearcher;

private Query query;

private DateFilterdateFilter;

private QueryFilterbobFilter;

privateQueryFilter sueFilter;

public void setUp() throwsException{

directory =newRAMDirectory();

IndexWriter writer=new IndexWriter(directory,newWhitespaceAnalyzer(),true);

Calendarcal=Calendar.getInstance();

cal.setTimeInMillies(1041397200000L);

 

for (int i=0;i<MAX;i++){

Document doc=new Document();

doc.add(Field.Keyword("key",""+(i+1)));

doc.add(Field.Keyword("owner",(i<MAX/2)?"bob":"sue"));

doc.add(Field.Keyword("date",cal.getTime()));

writer.addDocument(doc);

cal.add(Calendar.DATE,1);

}

writer.close();

searcher=new IndexSearcerh(directory);

BooleanQueryquery=newBooleanQuery();

bq.add(new TermQuery(newTerm("owner","bob")),false,false);

bq.add(new TermQuery(new Term("owner","sue")),false,false);

query=bq;

 

DatapastTheEnd=parseDate("2009 Jan 1");

dateFilter=DateFilter.Before("date",pastTheEnd);

bobFilter=newQueryFilter(new TermQuery(new Term("owner","bob")));

sueFilter=new QueryFilter(new TermQuery(newTerm("owner","sue")));

}

//.........

}

4、测试单个过滤器

ChaindFilter chain=new ChainedFilter(new Filter[]{dateFilter});

Hits hits=searcher.search(query,chain);

chain=new ChainedFilter(new Filter[] {bobFilter});

hits=searcher.search(query,chain);

5、测试OR过滤器

ChainedFilter chain=new chainedFilter(newFilter[]{sueFilter,bobFilter});

Hits hits=searcher.search(query,chain);

6、测试AND过滤器

//2个都要匹配

ChainedFilter chain=new chainedFilter(new Filter[]{dateFilter,bobFilter},Chainedfilter.AND);

Hits hits=searcher.search(query,chain);

7、测试XOR过滤器

//只能匹配其中的一个过滤器，不能2个都匹配

ChainedFilter chain=new chainedFilter(new Filter[]{dateFilter,sueFilter},Chainedfilter.XOR);

Hits hits=searcher.search(query,chain);
8、测试ANDNOT过滤器

ChainedFilter chain=new chainedFilter(new Filter[]{dateFilter,sueFilter},new int[]{Chainedfilter.AND,Chainedfilter.ANDNOT);//结果符合第一个过滤器，而不能匹配第二个过滤器

Hits hits=searcher.search(query,chain);