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Java IndexReader.docFreq方法代码示例

本文整理汇总了Java中org.apache.lucene.index.IndexReader.docFreq方法的典型用法代码示例。如果您正苦于以下问题:Java IndexReader.docFreq方法的具体用法?Java IndexReader.docFreq怎么用?Java IndexReader.docFreq使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在org.apache.lucene.index.IndexReader的用法示例。


在下文中一共展示了IndexReader.docFreq方法的2个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Java代码示例。

示例1: calculateWeight

import org.apache.lucene.index.IndexReader; //导入方法依赖的package包/类
protected float calculateWeight(Term term, IndexReader reader) throws IOException {
  //if a term is not in the index, then it's weight is 0
int docFrequency = reader.docFreq(term);
  if (docFrequency !=0) {
  	log.warn("Term {} doc freq.{}",term.toString(),docFrequency);
    return 1.0f / docFrequency;
  } else {
    log.warn("Couldn't find doc freq for term {}", term);
    return 0f;
  }

}
 
开发者ID:asmehra95,项目名称:wiseowl,代码行数:13,代码来源:PassageRankingComponent.java

示例2: explain

import org.apache.lucene.index.IndexReader; //导入方法依赖的package包/类
public Explanation explain(IndexReader reader, int doc)
  throws IOException {

  ComplexExplanation result = new ComplexExplanation();
  result.setDescription("weight("+getQuery()+" in "+doc+"), product of:");

  Explanation idfExpl =
    new Explanation(idf, "idf(docFreq=" + reader.docFreq(term) +
        ", numDocs=" + reader.numDocs() + ")");

  // explain query weight
  Explanation queryExpl = new Explanation();
  queryExpl.setDescription("queryWeight(" + getQuery() + "), product of:");

  Explanation boostExpl = new Explanation(getBoost(), "boost");
  if (getBoost() != 1.0f)
    queryExpl.addDetail(boostExpl);
  queryExpl.addDetail(idfExpl);

  Explanation queryNormExpl = new Explanation(queryNorm,"queryNorm");
  queryExpl.addDetail(queryNormExpl);

  queryExpl.setValue(boostExpl.getValue() *
                     idfExpl.getValue() *
                     queryNormExpl.getValue());

  result.addDetail(queryExpl);

  // explain field weight
  String field = term.field();
  ComplexExplanation fieldExpl = new ComplexExplanation();
  fieldExpl.setDescription("fieldWeight("+term+" in "+doc+
                           "), product of:");

  Explanation tfExpl = scorer(reader).explain(doc);
  fieldExpl.addDetail(tfExpl);
  fieldExpl.addDetail(idfExpl);

  Explanation fieldNormExpl = new Explanation();
  byte[] fieldNorms = reader.norms(field);
  float fieldNorm =
    fieldNorms!=null ? Similarity.decodeNorm(fieldNorms[doc]) : 0.0f;
  fieldNormExpl.setValue(fieldNorm);
  fieldNormExpl.setDescription("fieldNorm(field="+field+", doc="+doc+")");
  fieldExpl.addDetail(fieldNormExpl);
  
  fieldExpl.setMatch(Boolean.valueOf(tfExpl.isMatch()));
  fieldExpl.setValue(tfExpl.getValue() *
                     idfExpl.getValue() *
                     fieldNormExpl.getValue());

  result.addDetail(fieldExpl);
  result.setMatch(fieldExpl.getMatch());
  
  // combine them
  result.setValue(queryExpl.getValue() * fieldExpl.getValue());

  if (queryExpl.getValue() == 1.0f)
    return fieldExpl;

  return result;
}
 
开发者ID:Alfresco,项目名称:alfresco-repository,代码行数:63,代码来源:TermQuery.java


注:本文中的org.apache.lucene.index.IndexReader.docFreq方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。