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Java IndexReader.docFreq方法代碼示例

本文整理匯總了Java中org.apache.lucene.index.IndexReader.docFreq方法的典型用法代碼示例。如果您正苦於以下問題:Java IndexReader.docFreq方法的具體用法?Java IndexReader.docFreq怎麽用?Java IndexReader.docFreq使用的例子?那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在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個代碼示例,這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚,您的評價將有助於係統推薦出更棒的Java代碼示例。

示例1: calculateWeight

import org.apache.lucene.index.IndexReader; //導入方法依賴的package包/類
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;
  }

}
 
開發者ID:asmehra95,項目名稱:wiseowl,代碼行數:13,代碼來源:PassageRankingComponent.java

示例2: explain

import org.apache.lucene.index.IndexReader; //導入方法依賴的package包/類
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;
}
 
開發者ID:Alfresco,項目名稱:alfresco-repository,代碼行數:63,代碼來源:TermQuery.java


注:本文中的org.apache.lucene.index.IndexReader.docFreq方法示例由純淨天空整理自Github/MSDocs等開源代碼及文檔管理平台,相關代碼片段篩選自各路編程大神貢獻的開源項目,源碼版權歸原作者所有,傳播和使用請參考對應項目的License;未經允許,請勿轉載。