public override Query Rewrite(IndexReader reader)
{
if (minNrShouldMatch == 0 && clauses.Count == 1)
{
// optimize 1-clause queries
BooleanClause c = (BooleanClause)clauses[0];
if (!c.IsProhibited())
{
// just return clause
Query query = c.GetQuery().Rewrite(reader); // rewrite first
if (GetBoost() != 1.0f)
{
// incorporate boost
if (query == c.GetQuery())
{
// if rewrite was no-op
query = (Query)query.Clone(); // then clone before boost
}
query.SetBoost(GetBoost() * query.GetBoost());
}
return(query);
}
}
BooleanQuery clone = null; // recursively rewrite
for (int i = 0; i < clauses.Count; i++)
{
BooleanClause c = (BooleanClause)clauses[i];
Query query = c.GetQuery().Rewrite(reader);
if (query != c.GetQuery())
{
// clause rewrote: must clone
if (clone == null)
{
clone = (BooleanQuery)this.Clone();
}
clone.clauses[i] = new BooleanClause(query, c.GetOccur());
}
}
if (clone != null)
{
return(clone); // some clauses rewrote
}
else
{
return(this); // no clauses rewrote
}
}
/// <summary>Optimize our representation and our subqueries representations</summary>
/// <param name="reader">the IndexReader we query
/// </param>
/// <returns> an optimized copy of us (which may not be a copy if there is nothing to optimize)
/// </returns>
public override Query Rewrite(IndexReader reader)
{
int numDisjunctions = disjuncts.Count;
if (numDisjunctions == 1)
{
Query singleton = (Query)disjuncts[0];
Query result = singleton.Rewrite(reader);
if (GetBoost() != 1.0f)
{
if (result == singleton)
{
result = (Query)result.Clone();
}
result.SetBoost(GetBoost() * result.GetBoost());
}
return(result);
}
DisjunctionMaxQuery clone = null;
for (int i = 0; i < numDisjunctions; i++)
{
Query clause = (Query)disjuncts[i];
Query rewrite = clause.Rewrite(reader);
if (rewrite != clause)
{
if (clone == null)
{
clone = (DisjunctionMaxQuery)this.Clone();
}
clone.disjuncts[i] = rewrite;
}
}
if (clone != null)
{
return(clone);
}
else
{
return(this);
}
}