public Result Search (string term, int count, int start) {
try {
Query q1 = Parse (term, "hottext", true);
Query q2 = Parse (term, "text", false);
q2.SetBoost (0.7f);
Query q3 = Parse (term, "examples", false);
q3.SetBoost (0.5f);
BooleanQuery q = new BooleanQuery();
q.Add (q1, BooleanClause.Occur.SHOULD);
q.Add (q2, BooleanClause.Occur.SHOULD);
q.Add (q3, BooleanClause.Occur.SHOULD);
TopDocs top = SearchInternal (q, count, start);
Result r = new Result (term, searcher, top.ScoreDocs);
Results.Add (r);
return r;
} catch (IOException) {
Console.WriteLine ("No index in {0}", dir);
return null;
}
}
public override Query Rewrite(IndexReader reader)
{
if (!termLongEnough)
{
// can only match if it's exact
return new TermQuery(term);
}
FilteredTermEnum enumerator = GetEnum(reader);
int maxClauseCount = BooleanQuery.GetMaxClauseCount();
ScoreTermQueue stQueue = new ScoreTermQueue(maxClauseCount);
ScoreTerm reusableST = null;
try
{
do
{
float score = 0.0f;
Term t = enumerator.Term();
if (t != null)
{
score = enumerator.Difference();
if (reusableST == null)
{
reusableST = new ScoreTerm(t, score);
}
else if (score >= reusableST.score)
{
// reusableST holds the last "rejected" entry, so, if
// this new score is not better than that, there's no
// need to try inserting it
reusableST.score = score;
reusableST.term = t;
}
else
{
continue;
}
reusableST = (ScoreTerm) stQueue.InsertWithOverflow(reusableST);
}
}
while (enumerator.Next());
}
finally
{
enumerator.Close();
}
BooleanQuery query = new BooleanQuery(true);
int size = stQueue.Size();
for (int i = 0; i < size; i++)
{
ScoreTerm st = (ScoreTerm) stQueue.Pop();
TermQuery tq = new TermQuery(st.term); // found a match
tq.SetBoost(GetBoost() * st.score); // set the boost
query.Add(tq, BooleanClause.Occur.SHOULD); // add to query
}
return query;
}
public override Query Rewrite(IndexReader reader, MultiTermQuery query)
{
// Get the enum and start visiting terms. If we
// exhaust the enum before hitting either of the
// cutoffs, we use ConstantBooleanQueryRewrite; else,
// ConstantFilterRewrite:
System.Collections.ArrayList pendingTerms = new System.Collections.ArrayList();
int docCountCutoff = (int) ((docCountPercent / 100.0) * reader.MaxDoc());
int termCountLimit = System.Math.Min(BooleanQuery.GetMaxClauseCount(), termCountCutoff);
int docVisitCount = 0;
FilteredTermEnum enumerator = query.GetEnum(reader);
try
{
while (true)
{
Term t = enumerator.Term();
if (t != null)
{
pendingTerms.Add(t);
// Loading the TermInfo from the terms dict here
// should not be costly, because 1) the
// query/filter will load the TermInfo when it
// runs, and 2) the terms dict has a cache:
docVisitCount += reader.DocFreq(t);
}
if (pendingTerms.Count >= termCountLimit || docVisitCount >= docCountCutoff)
{
// Too many terms -- make a filter.
Query result = new ConstantScoreQuery(new MultiTermQueryWrapperFilter(query));
result.SetBoost(query.GetBoost());
return result;
}
else if (!enumerator.Next())
{
// Enumeration is done, and we hit a small
// enough number of terms & docs -- just make a
// BooleanQuery, now
System.Collections.IEnumerator it = pendingTerms.GetEnumerator();
BooleanQuery bq = new BooleanQuery(true);
while (it.MoveNext())
{
TermQuery tq = new TermQuery((Term) it.Current);
bq.Add(tq, BooleanClause.Occur.SHOULD);
}
// Strip scores
Query result = new ConstantScoreQuery(new QueryWrapperFilter(bq));
result.SetBoost(query.GetBoost());
query.IncTotalNumberOfTerms(pendingTerms.Count);
return result;
}
}
}
finally
{
enumerator.Close();
}
}
/// <summary>Expert: merges the clauses of a set of BooleanQuery's into a single
/// BooleanQuery.
///
/// <p/>A utility for use by {@link #Combine(Query[])} implementations.
/// </summary>
public static Query MergeBooleanQueries(BooleanQuery[] queries)
{
System.Collections.Hashtable allClauses = new System.Collections.Hashtable();
for (int i = 0; i < queries.Length; i++)
{
BooleanClause[] clauses = queries[i].GetClauses();
for (int j = 0; j < clauses.Length; j++)
{
SupportClass.CollectionsHelper.AddIfNotContains(allClauses, clauses[j]);
}
}
bool coordDisabled = queries.Length == 0?false:queries[0].IsCoordDisabled();
BooleanQuery result = new BooleanQuery(coordDisabled);
System.Collections.IEnumerator i2 = allClauses.GetEnumerator();
while (i2.MoveNext())
{
result.Add((BooleanClause) i2.Current);
}
return result;
}
public override Query Rewrite(IndexReader reader, MultiTermQuery query)
{
FilteredTermEnum enumerator = query.GetEnum(reader);
BooleanQuery result = new BooleanQuery(true);
int count = 0;
try
{
do
{
Term t = enumerator.Term();
if (t != null)
{
TermQuery tq = new TermQuery(t); // found a match
tq.SetBoost(query.GetBoost() * enumerator.Difference()); // set the boost
result.Add(tq, BooleanClause.Occur.SHOULD); // add to query
count++;
}
}
while (enumerator.Next());
}
finally
{
enumerator.Close();
}
query.IncTotalNumberOfTerms(count);
return result;
}
/// <summary>Expert: called when re-writing queries under MultiSearcher.
///
/// Create a single query suitable for use by all subsearchers (in 1-1
/// correspondence with queries). This is an optimization of the OR of
/// all queries. We handle the common optimization cases of equal
/// queries and overlapping clauses of boolean OR queries (as generated
/// by MultiTermQuery.rewrite()).
/// Be careful overriding this method as queries[0] determines which
/// method will be called and is not necessarily of the same type as
/// the other queries.
/// </summary>
public virtual Query Combine(Query[] queries)
{
System.Collections.Hashtable uniques = new System.Collections.Hashtable();
for (int i = 0; i < queries.Length; i++)
{
Query query = queries[i];
BooleanClause[] clauses = null;
// check if we can split the query into clauses
bool splittable = (query is BooleanQuery);
if (splittable)
{
BooleanQuery bq = (BooleanQuery) query;
splittable = bq.IsCoordDisabled();
clauses = bq.GetClauses();
for (int j = 0; splittable && j < clauses.Length; j++)
{
splittable = (clauses[j].GetOccur() == BooleanClause.Occur.SHOULD);
}
}
if (splittable)
{
for (int j = 0; j < clauses.Length; j++)
{
SupportClass.CollectionsHelper.AddIfNotContains(uniques, clauses[j].GetQuery());
}
}
else
{
SupportClass.CollectionsHelper.AddIfNotContains(uniques, query);
}
}
// optimization: if we have just one query, just return it
if (uniques.Count == 1)
{
foreach (object key in uniques.Keys)
{
return (Query) key;
}
}
BooleanQuery result = new BooleanQuery(true);
foreach (object key in uniques.Keys)
{
result.Add((Query) key, BooleanClause.Occur.SHOULD);
}
return result;
}
internal AnonymousClassSimilarityDelegator(BooleanQuery enclosingInstance, Mono.Lucene.Net.Search.Similarity Param1):base(Param1)
{
InitBlock(enclosingInstance);
}
private void InitBlock(BooleanQuery enclosingInstance)
{
this.enclosingInstance = enclosingInstance;
}
public BooleanWeight(BooleanQuery enclosingInstance, Searcher searcher)
{
InitBlock(enclosingInstance);
this.similarity = Enclosing_Instance.GetSimilarity(searcher);
weights = new System.Collections.ArrayList(Enclosing_Instance.clauses.Count);
for (int i = 0; i < Enclosing_Instance.clauses.Count; i++)
{
BooleanClause c = (BooleanClause) Enclosing_Instance.clauses[i];
weights.Add(c.GetQuery().CreateWeight(searcher));
}
}
public override Query Rewrite(IndexReader reader)
{
if (termArrays.Count == 1)
{
// optimize one-term case
Term[] terms = (Term[]) termArrays[0];
BooleanQuery boq = new BooleanQuery(true);
for (int i = 0; i < terms.Length; i++)
{
boq.Add(new TermQuery(terms[i]), BooleanClause.Occur.SHOULD);
}
boq.SetBoost(GetBoost());
return boq;
}
else
{
return this;
}
}
