public abstract Query Rewrite(IndexReader reader, MultiTermQuery query);
public override Query Rewrite(IndexReader reader, MultiTermQuery query)
{
Query result = new ConstantScoreQuery(new MultiTermQueryWrapperFilter(query));
result.SetBoost(query.GetBoost());
return result;
}
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();
}
}
public override Query Rewrite(IndexReader reader, MultiTermQuery query)
{
// strip the scores off
Query result = new ConstantScoreQuery(new QueryWrapperFilter(base.Rewrite(reader, query)));
result.SetBoost(query.GetBoost());
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;
}
public virtual void Generate(MultiTermQuery query, IndexReader reader, TermEnum enumerator)
{
int[] docs = new int[32];
int[] freqs = new int[32];
TermDocs termDocs = reader.TermDocs();
try
{
int termCount = 0;
do
{
Term term = enumerator.Term();
if (term == null)
break;
termCount++;
termDocs.Seek(term);
while (true)
{
int count = termDocs.Read(docs, freqs);
if (count != 0)
{
for (int i = 0; i < count; i++)
{
HandleDoc(docs[i]);
}
}
else
{
break;
}
}
}
while (enumerator.Next());
query.IncTotalNumberOfTerms(termCount); // {{Aroush-2.9}} is the use of 'temp' as is right?
}
finally
{
termDocs.Close();
}
}
/// <summary> Wrap a {@link MultiTermQuery} as a Filter.</summary>
protected internal MultiTermQueryWrapperFilter(MultiTermQuery query)
{
this.query = query;
}