Lucene学习总结-扩展查询

Lucene学习总结-扩展查询
custom sort method：

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1. Sort sort = new Sort(new SortField("location",  
2. new DistanceComparatorSource(10, 10)));  
3. TopFieldDocs docs = searcher.search(query, null, 3, sort);  
4. FieldDoc fieldDoc = (FieldDoc) docs.scoreDocs[0];  
5. Document document = searcher.doc(fieldDoc.doc);  

custom HitCollector：

[java] view plaincopy

1. public void testCollecting() throws Exception {  
2. TermQuery query = new TermQuery(new Term("contents", "junit"));  
3. IndexSearcher searcher = new IndexSearcher(TestUtil.getBookIndexDirectory());  
4. BookLinkCollector collector = new BookLinkCollector(searcher);  
5. searcher.search(query, collector);  
6. Map linkMap = collector.getLinks();  
7. TopDocs hits = searcher.search(query, 10);  
8. TestUtil.dumpHits(searcher, hits);  
9. searcher.close();  

Extending QueryParser：getFieldQuery，getFuzzyQuery，getPrefixQuery，getRangeQuery，getBooleanQuery，getWildcardQuery

custom filter：

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1. SpecialsAccessor accessor = new TestSpecialsAccessor(isbns);  
2. Filter filter = new SpecialsFilter(accessor);  
3. WildcardQuery educationBooks = // #2  
4. new WildcardQuery(new Term("category", "*education*")); // #2  
5. FilteredQuery edBooksOnSpecial = // #2  
6. new FilteredQuery(educationBooks, filter); // #2  
7. TermQuery logoBooks = // #3  
8. new TermQuery(new Term("subject", "logo")); // #3  
9. BooleanQuery logoOrEdBooks = new BooleanQuery(); // #4  
10. logoOrEdBooks.add(logoBooks, BooleanClause.Occur.SHOULD); // #4  
11. logoOrEdBooks.add(edBooksOnSpecial, BooleanClause.Occur.SHOULD); // #4  
12. TopDocs hits = searcher.search(logoOrEdBooks, 10);  

Payloads：相当于对文档分类，DefaultSimilarity，PayloadHelper,

http://www.cnblogs.com/ibook360/archive/2011/10/27/2217537.html

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1. doc1.add(new Field("category", "foods|0.984 shopping|0.503", Field.Store.YES, Field.Index.ANALYZED));    
2. String queries = "category:foods content:egg";    
3. searcher.setSimilarity(new PayloadSimilarity());   
4. payloadSearcher.display(payloadSearcher.search(queries), start, end);    

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