public override byte[] Norms(String fieldName)
{
byte[] norms = cachedNorms;
Similarity sim = GetSimilarity();
if (fieldName != cachedFieldName || sim != cachedSimilarity)
{
// not cached?
Info info = GetInfo(fieldName);
int numTokens = info != null ? info.NumTokens : 0;
int numOverlapTokens = info != null ? info.NumOverlapTokens : 0;
float boost = info != null ? info.Boost : 1.0f;
FieldInvertState invertState = new FieldInvertState(0, numTokens, numOverlapTokens, 0, boost);
float n = sim.ComputeNorm(fieldName, invertState);
byte norm = Similarity.EncodeNorm(n);
norms = new byte[] { norm };
// cache it for future reuse
cachedNorms = norms;
cachedFieldName = fieldName;
cachedSimilarity = sim;
if (DEBUG)
{
System.Diagnostics.Debug.WriteLine("MemoryIndexReader.norms: " + fieldName + ":" + n + ":" +
norm + ":" + numTokens);
}
}
return(norms);
}
internal override void Finish()
{
System.Diagnostics.Debug.Assert(docIDs.Length == norms.Length);
if (fieldInfo.isIndexed && !fieldInfo.omitNorms)
{
if (docIDs.Length <= upto)
{
System.Diagnostics.Debug.Assert(docIDs.Length == upto);
docIDs = ArrayUtil.Grow(docIDs, 1 + upto);
norms = ArrayUtil.Grow(norms, 1 + upto);
}
float norm = docState.similarity.ComputeNorm(fieldInfo.name, fieldState);
norms[upto] = Similarity.EncodeNorm(norm);
docIDs[upto] = docState.docID;
upto++;
}
}
static NormsWriter()
{
defaultNorm = Similarity.EncodeNorm(1.0f);
}
