Hi,
I am not sure if you are still searching the answer for your question. If
so, then please read on...
You can get the DF & IDF for each of the query terms in the query as below..
IndexReader reader = IndexReader.open(FSDirectory.open(new File(indexDir)),
true);
//Create a FilterIndexReader to invoke the abstract methods
FilterIndexReader filterIndexReader = new FilterIndexReader(reader);
//Number of documents in the index
int numDocs = filterIndexReader.numDocs();
//Iterate over each of the query words
for(String queryWord : queryWords){
Term term = new Term(searchField, queryWord.toLowerCase());
int docFreq = 0;
try {
docFreq = filterIndexReader.docFreq(term);
} catch (IOException e) {
logger.log(Level.SEVERE, null, e);
}
//Calculate IDF
double idf = 0.0;
if(docFreq > 0){
idf = Math.log10((double) numDocs / docFreq);
}
System.out.println(queryWord + "\tDF -" + docFreq + "\tIDF -" + idf);
}
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