// start is inclusive; end is exclusive (length = end-start)
public BitsSlice(IBits parent, ReaderSlice slice)
{
this.parent = parent;
this.start = slice.Start;
this.length = slice.Length;
Debug.Assert(length >= 0, "length=" + length);
}
public TermsEnumWithSlice(int index, ReaderSlice subSlice)
{
this.SubSlice = subSlice;
this.Index = index;
if (Debugging.AssertsEnabled)
{
Debugging.Assert(subSlice.Length >= 0, () => "length=" + subSlice.Length);
}
}
// start is inclusive; end is exclusive (length = end-start)
public BitsSlice(IBits parent, ReaderSlice slice)
{
this.parent = parent;
this.start = slice.Start;
this.length = slice.Length;
if (Debugging.AssertsEnabled)
{
Debugging.Assert(length >= 0, () => "length=" + length);
}
}
/// <summary>
/// Creates an ordinal map that allows mapping ords to/from a merged
/// space from <c>subs</c>. </summary>
/// <param name="owner"> a cache key </param>
/// <param name="subs"> <see cref="TermsEnum"/>s that support <see cref="TermsEnum.Ord"/>. They need
/// not be dense (e.g. can be FilteredTermsEnums). </param>
/// <exception cref="IOException"> if an I/O error occurred. </exception>
public OrdinalMap(object owner, TermsEnum[] subs)
{
// create the ordinal mappings by pulling a termsenum over each sub's
// unique terms, and walking a multitermsenum over those
this.owner = owner;
globalOrdDeltas = new MonotonicAppendingInt64Buffer(PackedInt32s.COMPACT);
firstSegments = new AppendingPackedInt64Buffer(PackedInt32s.COMPACT);
ordDeltas = new MonotonicAppendingInt64Buffer[subs.Length];
for (int i = 0; i < ordDeltas.Length; i++)
{
ordDeltas[i] = new MonotonicAppendingInt64Buffer();
}
long[] segmentOrds = new long[subs.Length];
ReaderSlice[] slices = new ReaderSlice[subs.Length];
TermsEnumIndex[] indexes = new TermsEnumIndex[slices.Length];
for (int i = 0; i < slices.Length; i++)
{
slices[i] = new ReaderSlice(0, 0, i);
indexes[i] = new TermsEnumIndex(subs[i], i);
}
MultiTermsEnum mte = new MultiTermsEnum(slices);
mte.Reset(indexes);
long globalOrd = 0;
while (mte.MoveNext())
{
TermsEnumWithSlice[] matches = mte.MatchArray;
for (int i = 0; i < mte.MatchCount; i++)
{
int segmentIndex = matches[i].Index;
long segmentOrd = matches[i].Terms.Ord;
long delta = globalOrd - segmentOrd;
// for each unique term, just mark the first segment index/delta where it occurs
if (i == 0)
{
firstSegments.Add(segmentIndex);
globalOrdDeltas.Add(delta);
}
// for each per-segment ord, map it back to the global term.
while (segmentOrds[segmentIndex] <= segmentOrd)
{
ordDeltas[segmentIndex].Add(delta);
segmentOrds[segmentIndex]++;
}
}
globalOrd++;
}
firstSegments.Freeze();
globalOrdDeltas.Freeze();
for (int i = 0; i < ordDeltas.Length; ++i)
{
ordDeltas[i].Freeze();
}
}
/// <summary>
/// Returns a sub-Bits matching the provided <paramref name="slice"/>
/// <para/>
/// Because <c>null</c> usually has a special meaning for
/// <see cref="IBits"/> (e.g. no deleted documents), you must check
/// <see cref="SubResult.Matches"/> instead to ensure the sub was
/// actually found.
/// </summary>
public SubResult GetMatchingSub(ReaderSlice slice)
{
int reader = ReaderUtil.SubIndex(slice.Start, starts);
Debug.Assert(reader != -1);
Debug.Assert(reader < subs.Length, "slice=" + slice + " starts[-1]=" + starts[starts.Length - 1]);
SubResult subResult = new SubResult();
if (starts[reader] == slice.Start && starts[1 + reader] == slice.Start + slice.Length)
{
subResult.Matches = true;
subResult.Result = subs[reader];
}
else
{
subResult.Matches = false;
}
return(subResult);
}
public TermsEnumWithSlice(int index, ReaderSlice subSlice)
{
this.SubSlice = subSlice;
this.Index = index;
Debug.Assert(subSlice.Length >= 0, "length=" + subSlice.Length);
}
