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类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;
}
}
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;
}