/* Walk through all unique text tokens (Posting
* instances) found in this field and serialize them
* into a single RAM segment. */
internal void AppendPostings(FreqProxTermsWriterPerField[] fields, FormatPostingsFieldsConsumer consumer)
{
int numFields = fields.Length;
FreqProxFieldMergeState[] mergeStates = new FreqProxFieldMergeState[numFields];
for (int i = 0; i < numFields; i++)
{
FreqProxFieldMergeState fms = mergeStates[i] = new FreqProxFieldMergeState(fields[i]);
System.Diagnostics.Debug.Assert(fms.field.fieldInfo == fields [0].fieldInfo);
// Should always be true
bool result = fms.NextTerm();
System.Diagnostics.Debug.Assert(result);
}
FormatPostingsTermsConsumer termsConsumer = consumer.AddField(fields[0].fieldInfo);
FreqProxFieldMergeState[] termStates = new FreqProxFieldMergeState[numFields];
bool currentFieldOmitTermFreqAndPositions = fields[0].fieldInfo.omitTermFreqAndPositions;
while (numFields > 0)
{
// Get the next term to merge
termStates[0] = mergeStates[0];
int numToMerge = 1;
for (int i = 1; i < numFields; i++)
{
char[] text = mergeStates[i].text;
int textOffset = mergeStates[i].textOffset;
int cmp = compareText(text, textOffset, termStates[0].text, termStates[0].textOffset);
if (cmp < 0)
{
termStates[0] = mergeStates[i];
numToMerge = 1;
}
else if (cmp == 0)
{
termStates[numToMerge++] = mergeStates[i];
}
}
FormatPostingsDocsConsumer docConsumer = termsConsumer.AddTerm(termStates[0].text, termStates[0].textOffset);
// Now termStates has numToMerge FieldMergeStates
// which all share the same term. Now we must
// interleave the docID streams.
while (numToMerge > 0)
{
FreqProxFieldMergeState minState = termStates[0];
for (int i = 1; i < numToMerge; i++)
{
if (termStates[i].docID < minState.docID)
{
minState = termStates[i];
}
}
int termDocFreq = minState.termFreq;
FormatPostingsPositionsConsumer posConsumer = docConsumer.AddDoc(minState.docID, termDocFreq);
ByteSliceReader prox = minState.prox;
// Carefully copy over the prox + payload info,
// changing the format to match Lucene's segment
// format.
if (!currentFieldOmitTermFreqAndPositions)
{
// omitTermFreqAndPositions == false so we do write positions &
// payload
int position = 0;
for (int j = 0; j < termDocFreq; j++)
{
int code = prox.ReadVInt();
position += (code >> 1);
int payloadLength;
if ((code & 1) != 0)
{
// This position has a payload
payloadLength = prox.ReadVInt();
if (payloadBuffer == null || payloadBuffer.Length < payloadLength)
{
payloadBuffer = new byte[payloadLength];
}
prox.ReadBytes(payloadBuffer, 0, payloadLength);
}
else
{
payloadLength = 0;
}
posConsumer.AddPosition(position, payloadBuffer, 0, payloadLength);
} //End for
posConsumer.Finish();
}
if (!minState.NextDoc())
{
// Remove from termStates
int upto = 0;
for (int i = 0; i < numToMerge; i++)
{
if (termStates[i] != minState)
{
termStates[upto++] = termStates[i];
}
}
numToMerge--;
System.Diagnostics.Debug.Assert(upto == numToMerge);
// Advance this state to the next term
if (!minState.NextTerm())
{
// OK, no more terms, so remove from mergeStates
// as well
upto = 0;
for (int i = 0; i < numFields; i++)
{
if (mergeStates[i] != minState)
{
mergeStates[upto++] = mergeStates[i];
}
}
numFields--;
System.Diagnostics.Debug.Assert(upto == numFields);
}
}
}
docConsumer.Finish();
}
termsConsumer.Finish();
}
