org.opencms.search

类 CmsSearchSimilarity

java.lang.Object

org.apache.lucene.search.similarities.Similarity

org.apache.lucene.search.similarities.TFIDFSimilarity

org.apache.lucene.search.similarities.DefaultSimilarity

org.opencms.search.CmsSearchSimilarity

public class CmsSearchSimilarity
extends org.apache.lucene.search.similarities.DefaultSimilarity

Reduces the importance of the lengthNorm(FieldInvertState) factor for the CmsSearchField.FIELD_CONTENT field, while keeping the Lucene default for all other fields.

This implementation was added since apparently the default length norm is heavily biased for small documents. In the default, even if a term is found in 2 documents the same number of times, the smaller document (containing less terms) will have a score easily 3x as high as the longer document. Using this implementation the importance of the term number is reduced.

Inspired by Chuck Williams WikipediaSimilarity.

从以下版本开始:

6.0.0

嵌套类概要

从类继承的嵌套类/接口 org.apache.lucene.search.similarities.Similarity

org.apache.lucene.search.similarities.Similarity.ExactSimScorer, org.apache.lucene.search.similarities.Similarity.SimWeight, org.apache.lucene.search.similarities.Similarity.SloppySimScorer

字段概要

从类继承的字段 org.apache.lucene.search.similarities.DefaultSimilarity

discountOverlaps

构造器概要

构造器

构造器和说明
CmsSearchSimilarity() Creates a new instance of the OpenCms search similarity.

方法概要

方法

限定符和类型	方法和说明
float	lengthNorm(org.apache.lucene.index.FieldInvertState state) Special implementation for "compute norm" to reduce the significance of this factor for the CmsSearchField.FIELD_CONTENT field, while keeping the Lucene default for all other fields.

从类继承的方法 org.apache.lucene.search.similarities.DefaultSimilarity

coord, getDiscountOverlaps, idf, queryNorm, scorePayload, setDiscountOverlaps, sloppyFreq, tf, toString

从类继承的方法 org.apache.lucene.search.similarities.TFIDFSimilarity

computeNorm, computeWeight, decodeNormValue, encodeNormValue, exactSimScorer, idfExplain, idfExplain, sloppySimScorer, tf

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

构造器详细资料

CmsSearchSimilarity

public CmsSearchSimilarity()

Creates a new instance of the OpenCms search similarity.

方法详细资料

lengthNorm

public float lengthNorm(org.apache.lucene.index.FieldInvertState state)

Special implementation for "compute norm" to reduce the significance of this factor for the CmsSearchField.FIELD_CONTENT field, while keeping the Lucene default for all other fields.

覆盖:

lengthNorm 在类中 org.apache.lucene.search.similarities.DefaultSimilarity