public void TestMoreLikeThisQuery()
{
Query query = new MoreLikeThisQuery("this is a test", new[] { "text" }, new MockAnalyzer(Random()), "text");
QueryUtils.Check(Random(), query, searcher, Similarity);
}
/// <summary>
/// (non-Javadoc)
/// @see org.apache.lucene.xmlparser.QueryObjectBuilder#process(org.w3c.dom.Element)
/// </summary>
public virtual Query GetQuery(XmlElement e)
{
string fieldsList = e.GetAttribute("fieldNames"); //a comma-delimited list of fields
string[] fields = defaultFieldNames;
if ((fieldsList != null) && (fieldsList.Trim().Length > 0))
{
fields = fieldsList.Trim().Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
//trim the fieldnames
for (int i = 0; i < fields.Length; i++)
{
fields[i] = fields[i].Trim();
}
}
//Parse any "stopWords" attribute
//TODO MoreLikeThis needs to ideally have per-field stopWords lists - until then
//I use all analyzers/fields to generate multi-field compatible stop list
string stopWords = e.GetAttribute("stopWords");
HashSet<string> stopWordsSet = null;
if ((stopWords != null) && (fields != null))
{
stopWordsSet = new HashSet<string>();
foreach (string field in fields)
{
TokenStream ts = null;
try
{
ts = analyzer.TokenStream(field, stopWords);
ICharTermAttribute termAtt = ts.AddAttribute<ICharTermAttribute>();
ts.Reset();
while (ts.IncrementToken())
{
stopWordsSet.Add(termAtt.ToString());
}
ts.End();
}
catch (IOException ioe)
{
throw new ParserException("IoException parsing stop words list in "
+ GetType().Name + ":" + ioe.Message);
}
finally
{
IOUtils.CloseWhileHandlingException(ts);
}
}
}
MoreLikeThisQuery mlt = new MoreLikeThisQuery(DOMUtils.GetText(e), fields, analyzer, fields[0]);
mlt.MaxQueryTerms = DOMUtils.GetAttribute(e, "maxQueryTerms", DEFAULT_MAX_QUERY_TERMS);
mlt.MinTermFrequency = DOMUtils.GetAttribute(e, "minTermFrequency", DEFAULT_MIN_TERM_FREQUENCY);
mlt.PercentTermsToMatch = DOMUtils.GetAttribute(e, "percentTermsToMatch", DEFAULT_PERCENT_TERMS_TO_MATCH) / 100;
mlt.StopWords = stopWordsSet;
int minDocFreq = DOMUtils.GetAttribute(e, "minDocFreq", -1);
if (minDocFreq >= 0)
{
mlt.MinDocFreq = minDocFreq;
}
mlt.Boost = DOMUtils.GetAttribute(e, "boost", 1.0f);
return mlt;
}
