Lucene++ - a full-featured, c++ search engine
API Documentation

- Main Page
- Related Pages
- Namespaces
- Data Structures
- Files

- File List
- Globals

All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Pages
DefaultSimilarity.h
Go to the documentation of this file.
1 // Copyright (c) 2009-2011 Alan Wright. All rights reserved.
3 // Distributable under the terms of either the Apache License (Version 2.0)
4 // or the GNU Lesser General Public License.
6
7 #ifndef DEFAULTSIMILARITY_H
8 #define DEFAULTSIMILARITY_H
9
10 #include "Similarity.h"
11
12 namespace Lucene
13 {
15 class LPPAPI DefaultSimilarity : public Similarity
16 {
17 public:
18 DefaultSimilarity();
19 virtual ~DefaultSimilarity();
20
21 LUCENE_CLASS(DefaultSimilarity);
22
23 protected:
24 bool discountOverlaps; // Default false
25
26 public:
30 virtual double computeNorm(const String& fieldName, FieldInvertStatePtr state);
31
33 virtual double lengthNorm(const String& fieldName, int32_t numTokens);
34
36 virtual double queryNorm(double sumOfSquaredWeights);
37
39 virtual double tf(double freq);
40
42 virtual double sloppyFreq(int32_t distance);
43
45 virtual double idf(int32_t docFreq, int32_t numDocs);
46
48 virtual double coord(int32_t overlap, int32_t maxOverlap);
49
53 void setDiscountOverlaps(bool v);
54
56 bool getDiscountOverlaps();
57 };
58 }
59
60 #endif

clucene.sourceforge.net