Hi,
I am currently using the latest port of Lucene and Highlighter for
an application that I am working on. I found that the highlighting
module was failing to return any highlight results, even if the term
existed in the document. After some investigaton the issue turns out to
be in the file QueryTermExtractor.cs method GetTerms(..) reproduced
below, with the changes necessary for the code to work correctly.
A couple of notes:
1. Iteration should be over the nonWeightedTerms hash. I confirmed that
this is what the Java version does.
2. Using the dictionary iteration over the hash. Each iteration gives
us access to the key or value. Both are identical so I opted for the
value (more readable) to get the term from. Note that the original
dictionary iteration will fail becauase an iterator cannot be casted to
a Term type (only the value or key pointed to by the iterator can).
//fieldname MUST be interned prior to this call
private static void GetTerms(Query query,
System.Collections.Hashtable terms, bool prohibited, System.String
fieldName)
{
try
{
System.Collections.Hashtable nonWeightedTerms = new
System.Collections.Hashtable();
query.ExtractTerms(nonWeightedTerms);
/*
foreach (Term term in terms.Values)
{
if ((fieldName == null) || (term.Field() == fieldName))
{
WeightedTerm temp = new
WeightedTerm(query.GetBoost(), term.Text());
terms.Add(temp, temp);
}
}
*/
System.Collections.IDictionaryEnumerator iter =
nonWeightedTerms.GetEnumerator();
while (iter.MoveNext()) {
Term term = (Term)iter.Value;
if ((fieldName == null) || (term.Field() ==
fieldName)) {
WeightedTerm temp = new
WeightedTerm(query.GetBoost(), term.Text());
terms.Add(temp, temp);
}
}
/*
for (System.Collections.IEnumerator iter =
nonWeightedTerms.GetEnumerator(); iter.MoveNext(); )
{
Term term = (Term) iter.Current;
if ((fieldName == null) || (term.Field() == fieldName))
{
WeightedTerm temp = new
WeightedTerm(query.GetBoost(), term.Text());
terms.Add(temp, temp);
}
}
*/
}
catch (System.NotSupportedException ignore)
{
//this is non-fatal for our purposes
}
}
Hth
Reuben.
