/// <summary>Skips to the first match beyond the current whose document number is
/// greater than or equal to a given target.
/// <br>The implementation uses {@link TermDocs#SkipTo(int)}.
/// </summary>
/// <param name="target">The target document number.
/// </param>
/// <returns> true iff there is such a match.
/// </returns>
public override bool SkipTo(int target)
{
// first scan in cache
for (pointer++; pointer < pointerMax; pointer++)
{
if (docs[pointer] >= target)
{
doc = docs[pointer];
return true;
}
}
// not found in cache, seek underlying stream
bool result = termDocs.SkipTo(target);
if (result)
{
pointerMax = 1;
pointer = 0;
docs[pointer] = doc = termDocs.Doc();
freqs[pointer] = termDocs.Freq();
}
else
{
doc = System.Int32.MaxValue;
}
return result;
}
/// <summary> Advances to the first match beyond the current whose document number is
/// greater than or equal to a given target. <br/>
/// The implementation uses {@link TermDocs#SkipTo(int)}.
///
/// </summary>
/// <param name="target">The target document number.
/// </param>
/// <returns> the matching document or -1 if none exist.
/// </returns>
public override int Advance(int target)
{
// first scan in cache
for (pointer++; pointer < pointerMax; pointer++)
{
if (docs[pointer] >= target)
{
return(doc = docs[pointer]);
}
}
// not found in cache, seek underlying stream
bool result = termDocs.SkipTo(target);
if (result)
{
pointerMax = 1;
pointer = 0;
docs[pointer] = doc = termDocs.Doc();
freqs[pointer] = termDocs.Freq();
}
else
{
doc = NO_MORE_DOCS;
}
return(doc);
}
public override int Advance(int target)
{
if (!termDocs.SkipTo(target))
{
return(doc = NO_MORE_DOCS);
}
while (!Enclosing_Instance.MatchDoc(doc = termDocs.Doc))
{
if (!termDocs.Next())
{
return(doc = NO_MORE_DOCS);
}
}
return(doc);
}
public override int Advance(int target)
{
return(doc = termDocs.SkipTo(target)?termDocs.Doc():NO_MORE_DOCS);
}
public override Explanation Explain(IndexReader reader, int doc)
{
ComplexExplanation result = new ComplexExplanation();
result.Description = "weight(" + Query + " in " + doc + "), product of:";
Explanation expl = new Explanation(idf, idfExp.Explain());
// explain query weight
Explanation queryExpl = new Explanation();
queryExpl.Description = "queryWeight(" + Query + "), product of:";
Explanation boostExpl = new Explanation(Enclosing_Instance.Boost, "boost");
if (Enclosing_Instance.Boost != 1.0f)
{
queryExpl.AddDetail(boostExpl);
}
queryExpl.AddDetail(expl);
Explanation queryNormExpl = new Explanation(queryNorm, "queryNorm");
queryExpl.AddDetail(queryNormExpl);
queryExpl.Value = boostExpl.Value * expl.Value * queryNormExpl.Value;
result.AddDetail(queryExpl);
// explain field weight
string field = Enclosing_Instance.term.Field;
ComplexExplanation fieldExpl = new ComplexExplanation();
fieldExpl.Description = "fieldWeight(" + Enclosing_Instance.term + " in " + doc + "), product of:";
Explanation tfExplanation = new Explanation();
int tf = 0;
TermDocs termDocs = reader.TermDocs(enclosingInstance.term);
if (termDocs != null)
{
try
{
if (termDocs.SkipTo(doc) && termDocs.Doc == doc)
{
tf = termDocs.Freq;
}
}
finally
{
termDocs.Close();
}
tfExplanation.Value = similarity.Tf(tf);
tfExplanation.Description = "tf(termFreq(" + enclosingInstance.term + ")=" + tf + ")";
}
else
{
tfExplanation.Value = 0.0f;
tfExplanation.Description = "no matching term";
}
fieldExpl.AddDetail(tfExplanation);
fieldExpl.AddDetail(expl);
Explanation fieldNormExpl = new Explanation();
byte[] fieldNorms = reader.Norms(field);
float fieldNorm = fieldNorms != null?Similarity.DecodeNorm(fieldNorms[doc]) : 1.0f;
fieldNormExpl.Value = fieldNorm;
fieldNormExpl.Description = "fieldNorm(field=" + field + ", doc=" + doc + ")";
fieldExpl.AddDetail(fieldNormExpl);
fieldExpl.Match = tfExplanation.IsMatch;
fieldExpl.Value = tfExplanation.Value * expl.Value * fieldNormExpl.Value;
result.AddDetail(fieldExpl);
bool?tempAux = fieldExpl.Match;
result.Match = tempAux;
// combine them
result.Value = queryExpl.Value * fieldExpl.Value;
if (queryExpl.Value == 1.0f)
{
return(fieldExpl);
}
return(result);
}
public override bool SkipTo(int target)
{
return(termDocs.SkipTo(target));
}
