private static void GetTermsFromTermQuery(TermQuery query, HashSetSupport terms, string fieldName)
{
if ((fieldName == null) || (query.GetTerm().Field() == (string)(object)fieldName))
{
terms.Add(new WeightedTerm(query.GetBoost(), query.GetTerm().Text()));
}
}
private static void GetTermsFromSpanNearQuery(SpanNearQuery query, HashSetSupport terms, string fieldName)
{
ICollection queryTerms = query.GetTerms();
for (IEnumerator iterator = queryTerms.GetEnumerator(); iterator.MoveNext(); )
{
// break it out for debugging.
Term term = (Term) iterator.Current;
string text = term.Text();
if ((fieldName == null) || (term.Field() == (string)(object)fieldName))
{
terms.Add(new WeightedTerm(query.GetBoost(), text));
}
}
}
private static void GetTermsFromPhraseQuery(PhraseQuery query, HashSetSupport terms, string fieldName)
{
Term[] queryTerms = query.GetTerms();
int i;
for (i = 0; i < queryTerms.Length; i++)
{
if ((fieldName == null) || (queryTerms[i].Field() == (string)(object)fieldName))
{
terms.Add(new WeightedTerm(query.GetBoost(), queryTerms[i].Text()));
}
}
}
private static void GetTermsFromBooleanQuery(BooleanQuery query, HashSetSupport terms, bool prohibited, string fieldName)
{
BooleanClause[] queryClauses = query.GetClauses();
int i;
for (i = 0; i < queryClauses.Length; i++)
{
if (prohibited || !queryClauses[i].prohibited)
GetTerms(queryClauses[i].query, terms, prohibited, fieldName);
}
}
private static void GetTerms(Query query, HashSetSupport terms, bool prohibited, string fieldName)
{
if (query is BooleanQuery)
GetTermsFromBooleanQuery((BooleanQuery) query, terms, prohibited, fieldName);
else if (query is PhraseQuery)
GetTermsFromPhraseQuery((PhraseQuery) query, terms, fieldName);
else if (query is TermQuery)
GetTermsFromTermQuery((TermQuery) query, terms, fieldName);
else if (query is SpanNearQuery)
GetTermsFromSpanNearQuery((SpanNearQuery) query, terms, fieldName);
}
/// <summary> Extracts all terms texts of a given Query into an array of WeightedTerms
///
/// </summary>
/// <param name="query"> Query to extract term texts from
/// </param>
/// <param name="prohibited"><code>true</code> to extract "prohibited" terms, too
/// </param>
/// <param name="fieldName"> The fieldName used to filter query terms
/// </param>
/// <returns> an array of the terms used in a query, plus their weights.
/// </returns>
public static WeightedTerm[] GetTerms(Query query, bool prohibited, string fieldName)
{
HashSetSupport terms = new HashSetSupport();
if (fieldName != null)
{
fieldName = String.Intern(fieldName);
}
GetTerms(query, terms, prohibited, fieldName);
//return (WeightedTerm[]) ICollectionSupport.ToArray(terms, new WeightedTerm[0]);
return (WeightedTerm[]) terms.ToArray(typeof(WeightedTerm));
}