There is a HighFreqTerms class in contib/misc..... that may be interesting to
you. I just modified it slightly locally last night to limit things to a
specific field, and will commit it later.
Otis
----- Original Message ----
From: Dmitry Goldenberg <[EMAIL PROTECTED]>
To: java-user@lucene.apache.org
Sent: Mon 06 Feb 2006 05:34:05 PM EST
Subject: How to get mapping of query terms to number of their occurrences in a
doc?
Given a query, I want to be able to, for each query term, get the number of
occurrences of the term. I have tried what I'm including below and it does not
seem to provide reliable results. Seems to work fine with exact matching but
as soon as stemming kicks in, all bets are off as to value of the number of
occurrences returned.
Any ideas, anyone? Can this be written in a simpler and/or more efficient way?
Thanks -
int totalOccurrences = 0;
reader = IndexReader.open(getDirectory(indexDirPath));
HashSet terms = new HashSet();
query.extractTerms(terms);
TermFreqVector[] tfvs = reader.getTermFreqVectors(docId);
if (tfvs != null) {
// For each term frequency vector (i.e. for each field)
for (int i = 0; i < tfvs.length; i++) {
String field = tfvs[i].getField();
String[] strTerms = tfvs[i].getTerms();
int[] tfs = tfvs[i].getTermFrequencies();
if (strTerms != null) {
// For each term in the query
for (Iterator iter = terms.iterator(); iter.hasNext();) {
Term term = (Term) iter.next();
// For each term in the vector
for (int j = 0; j < strTerms.length; j++) {
// If found the query term among the vector terms
if (field.equals(term.field()) &&
strTerms[j].equals(term.text())) {
// Add the term frequency to the total
totalOccurrences += tfs[j];
}
}
}
}
}
}
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