/// <summary>
/// Returns <see cref="DocsAndPositionsEnum"/> for the specified
/// field & term, with control over whether offsets and payloads are
/// required. Some codecs may be able to optimize
/// their implementation when offsets and/or payloads are not
/// required. This will return <c>null</c> if the field or term does not
/// exist or positions were not indexed. See
/// <see cref="TermsEnum.DocsAndPositions(IBits, DocsAndPositionsEnum, DocsAndPositionsFlags)"/>.
/// </summary>
public static DocsAndPositionsEnum GetTermPositionsEnum(IndexReader r, IBits liveDocs, string field, BytesRef term, DocsAndPositionsFlags flags)
{
Debug.Assert(field != null);
Debug.Assert(term != null);
Terms terms = GetTerms(r, field);
if (terms != null)
{
TermsEnum termsEnum = terms.GetIterator(null);
if (termsEnum.SeekExact(term))
{
return(termsEnum.DocsAndPositions(liveDocs, null, flags));
}
}
return(null);
}
/// <summary>
/// Returns <see cref="DocsAndPositionsEnum"/> for the specified
/// term. This will return <c>null</c> if the
/// field or term does not exist or positions weren't indexed. </summary>
/// <seealso cref="TermsEnum.DocsAndPositions(IBits, DocsAndPositionsEnum)"/>
public DocsAndPositionsEnum GetTermPositionsEnum(Term term) // LUCENENET specific: Renamed from TermPositionsEnum()
{
Debug.Assert(term.Field != null);
Debug.Assert(term.Bytes != null);
Fields fields = Fields;
if (fields != null)
{
Terms terms = fields.GetTerms(term.Field);
if (terms != null)
{
TermsEnum termsEnum = terms.GetIterator(null);
if (termsEnum.SeekExact(term.Bytes))
{
return(termsEnum.DocsAndPositions(LiveDocs, null));
}
}
}
return(null);
}
/// <summary>
/// Call this only once (if you subclass!) </summary>
protected virtual void Uninvert(AtomicReader reader, IBits liveDocs, BytesRef termPrefix)
{
FieldInfo info = reader.FieldInfos.FieldInfo(m_field);
if (info != null && info.HasDocValues)
{
throw new InvalidOperationException("Type mismatch: " + m_field + " was indexed as " + info.DocValuesType);
}
//System.out.println("DTO uninvert field=" + field + " prefix=" + termPrefix);
long startTime = Environment.TickCount;
m_prefix = termPrefix == null ? null : BytesRef.DeepCopyOf(termPrefix);
int maxDoc = reader.MaxDoc;
int[] index = new int[maxDoc]; // immediate term numbers, or the index into the byte[] representing the last number
int[] lastTerm = new int[maxDoc]; // last term we saw for this document
var bytes = new sbyte[maxDoc][]; // list of term numbers for the doc (delta encoded vInts)
Fields fields = reader.Fields;
if (fields == null)
{
// No terms
return;
}
Terms terms = fields.GetTerms(m_field);
if (terms == null)
{
// No terms
return;
}
TermsEnum te = terms.GetIterator(null);
BytesRef seekStart = termPrefix != null ? termPrefix : new BytesRef();
//System.out.println("seekStart=" + seekStart.utf8ToString());
if (te.SeekCeil(seekStart) == TermsEnum.SeekStatus.END)
{
// No terms match
return;
}
// If we need our "term index wrapper", these will be
// init'd below:
IList <BytesRef> indexedTerms = null;
PagedBytes indexedTermsBytes = null;
bool testedOrd = false;
// we need a minimum of 9 bytes, but round up to 12 since the space would
// be wasted with most allocators anyway.
var tempArr = new sbyte[12];
//
// enumerate all terms, and build an intermediate form of the un-inverted field.
//
// During this intermediate form, every document has a (potential) byte[]
// and the int[maxDoc()] array either contains the termNumber list directly
// or the *end* offset of the termNumber list in it's byte array (for faster
// appending and faster creation of the final form).
//
// idea... if things are too large while building, we could do a range of docs
// at a time (but it would be a fair amount slower to build)
// could also do ranges in parallel to take advantage of multiple CPUs
// OPTIONAL: remap the largest df terms to the lowest 128 (single byte)
// values. this requires going over the field first to find the most
// frequent terms ahead of time.
int termNum = 0;
m_docsEnum = null;
// Loop begins with te positioned to first term (we call
// seek above):
for (; ;)
{
BytesRef t = te.Term;
if (t == null || (termPrefix != null && !StringHelper.StartsWith(t, termPrefix)))
{
break;
}
//System.out.println("visit term=" + t.utf8ToString() + " " + t + " termNum=" + termNum);
if (!testedOrd)
{
try
{
m_ordBase = (int)te.Ord;
//System.out.println("got ordBase=" + ordBase);
}
#pragma warning disable 168
catch (NotSupportedException uoe)
#pragma warning restore 168
{
// Reader cannot provide ord support, so we wrap
// our own support by creating our own terms index:
indexedTerms = new List <BytesRef>();
indexedTermsBytes = new PagedBytes(15);
//System.out.println("NO ORDS");
}
testedOrd = true;
}
VisitTerm(te, termNum);
if (indexedTerms != null && (termNum & indexIntervalMask) == 0)
{
// Index this term
m_sizeOfIndexedStrings += t.Length;
BytesRef indexedTerm = new BytesRef();
indexedTermsBytes.Copy(t, indexedTerm);
// TODO: really should 1) strip off useless suffix,
// and 2) use FST not array/PagedBytes
indexedTerms.Add(indexedTerm);
}
int df = te.DocFreq;
if (df <= m_maxTermDocFreq)
{
m_docsEnum = te.Docs(liveDocs, m_docsEnum, DocsFlags.NONE);
// dF, but takes deletions into account
int actualDF = 0;
for (; ;)
{
int doc = m_docsEnum.NextDoc();
if (doc == DocIdSetIterator.NO_MORE_DOCS)
{
break;
}
//System.out.println(" chunk=" + chunk + " docs");
actualDF++;
m_termInstances++;
//System.out.println(" docID=" + doc);
// add TNUM_OFFSET to the term number to make room for special reserved values:
// 0 (end term) and 1 (index into byte array follows)
int delta = termNum - lastTerm[doc] + TNUM_OFFSET;
lastTerm[doc] = termNum;
int val = index[doc];
if ((val & 0xff) == 1)
{
// index into byte array (actually the end of
// the doc-specific byte[] when building)
int pos = (int)((uint)val >> 8);
int ilen = VInt32Size(delta);
var arr = bytes[doc];
int newend = pos + ilen;
if (newend > arr.Length)
{
// We avoid a doubling strategy to lower memory usage.
// this faceting method isn't for docs with many terms.
// In hotspot, objects have 2 words of overhead, then fields, rounded up to a 64-bit boundary.
// TODO: figure out what array lengths we can round up to w/o actually using more memory
// (how much space does a byte[] take up? Is data preceded by a 32 bit length only?
// It should be safe to round up to the nearest 32 bits in any case.
int newLen = (newend + 3) & unchecked ((int)0xfffffffc); // 4 byte alignment
var newarr = new sbyte[newLen];
Array.Copy(arr, 0, newarr, 0, pos);
arr = newarr;
bytes[doc] = newarr;
}
pos = WriteInt32(delta, arr, pos);
index[doc] = (pos << 8) | 1; // update pointer to end index in byte[]
}
else
{
// OK, this int has data in it... find the end (a zero starting byte - not
// part of another number, hence not following a byte with the high bit set).
int ipos;
if (val == 0)
{
ipos = 0;
}
else if ((val & 0x0000ff80) == 0)
{
ipos = 1;
}
else if ((val & 0x00ff8000) == 0)
{
ipos = 2;
}
else if ((val & 0xff800000) == 0)
{
ipos = 3;
}
else
{
ipos = 4;
}
//System.out.println(" ipos=" + ipos);
int endPos = WriteInt32(delta, tempArr, ipos);
//System.out.println(" endpos=" + endPos);
if (endPos <= 4)
{
//System.out.println(" fits!");
// value will fit in the integer... move bytes back
for (int j = ipos; j < endPos; j++)
{
val |= (tempArr[j] & 0xff) << (j << 3);
}
index[doc] = val;
}
else
{
// value won't fit... move integer into byte[]
for (int j = 0; j < ipos; j++)
{
tempArr[j] = (sbyte)val;
val = (int)((uint)val >> 8);
}
// point at the end index in the byte[]
index[doc] = (endPos << 8) | 1;
bytes[doc] = tempArr;
tempArr = new sbyte[12];
}
}
}
SetActualDocFreq(termNum, actualDF);
}
termNum++;
if (te.Next() == null)
{
break;
}
}
m_numTermsInField = termNum;
long midPoint = Environment.TickCount;
if (m_termInstances == 0)
{
// we didn't invert anything
// lower memory consumption.
m_tnums = null;
}
else
{
this.m_index = index;
//
// transform intermediate form into the final form, building a single byte[]
// at a time, and releasing the intermediate byte[]s as we go to avoid
// increasing the memory footprint.
//
for (int pass = 0; pass < 256; pass++)
{
var target = m_tnums[pass];
var pos = 0; // end in target;
if (target != null)
{
pos = target.Length;
}
else
{
target = new sbyte[4096];
}
// loop over documents, 0x00ppxxxx, 0x01ppxxxx, 0x02ppxxxx
// where pp is the pass (which array we are building), and xx is all values.
// each pass shares the same byte[] for termNumber lists.
for (int docbase = pass << 16; docbase < maxDoc; docbase += (1 << 24))
{
int lim = Math.Min(docbase + (1 << 16), maxDoc);
for (int doc = docbase; doc < lim; doc++)
{
//System.out.println(" pass="******" process docID=" + doc);
int val = index[doc];
if ((val & 0xff) == 1)
{
int len = (int)((uint)val >> 8);
//System.out.println(" ptr pos=" + pos);
index[doc] = (pos << 8) | 1; // change index to point to start of array
if ((pos & 0xff000000) != 0)
{
// we only have 24 bits for the array index
throw new InvalidOperationException("Too many values for UnInvertedField faceting on field " + m_field);
}
var arr = bytes[doc];
/*
* for(byte b : arr) {
* //System.out.println(" b=" + Integer.toHexString((int) b));
* }
*/
bytes[doc] = null; // IMPORTANT: allow GC to avoid OOM
if (target.Length <= pos + len)
{
int newlen = target.Length;
//* we don't have to worry about the array getting too large
// since the "pos" param will overflow first (only 24 bits available)
// if ((newlen<<1) <= 0) {
// // overflow...
// newlen = Integer.MAX_VALUE;
// if (newlen <= pos + len) {
// throw new SolrException(400,"Too many terms to uninvert field!");
// }
// } else {
// while (newlen <= pos + len) newlen<<=1; // doubling strategy
// }
//
while (newlen <= pos + len) // doubling strategy
{
newlen <<= 1;
}
var newtarget = new sbyte[newlen];
Array.Copy(target, 0, newtarget, 0, pos);
target = newtarget;
}
Array.Copy(arr, 0, target, pos, len);
pos += len + 1; // skip single byte at end and leave it 0 for terminator
}
}
}
// shrink array
if (pos < target.Length)
{
var newtarget = new sbyte[pos];
Array.Copy(target, 0, newtarget, 0, pos);
target = newtarget;
}
m_tnums[pass] = target;
if ((pass << 16) > maxDoc)
{
break;
}
}
}
if (indexedTerms != null)
{
m_indexedTermsArray = new BytesRef[indexedTerms.Count];
indexedTerms.CopyTo(m_indexedTermsArray, 0);
}
long endTime = Environment.TickCount;
m_total_time = (int)(endTime - startTime);
m_phase1_time = (int)(midPoint - startTime);
}
// DocValues updates
private void ApplyDocValuesUpdates <T1>(IEnumerable <T1> updates, ReadersAndUpdates rld, SegmentReader reader, DocValuesFieldUpdates.Container dvUpdatesContainer) where T1 : DocValuesUpdate
{
lock (this)
{
Fields fields = reader.Fields;
if (fields == null)
{
// this reader has no postings
return;
}
// TODO: we can process the updates per DV field, from last to first so that
// if multiple terms affect same document for the same field, we add an update
// only once (that of the last term). To do that, we can keep a bitset which
// marks which documents have already been updated. So e.g. if term T1
// updates doc 7, and then we process term T2 and it updates doc 7 as well,
// we don't apply the update since we know T1 came last and therefore wins
// the update.
// We can also use that bitset as 'liveDocs' to pass to TermEnum.docs(), so
// that these documents aren't even returned.
string currentField = null;
TermsEnum termsEnum = null;
DocsEnum docs = null;
//System.out.println(Thread.currentThread().getName() + " numericDVUpdate reader=" + reader);
foreach (DocValuesUpdate update in updates)
{
Term term = update.term;
int limit = update.docIDUpto;
// TODO: we traverse the terms in update order (not term order) so that we
// apply the updates in the correct order, i.e. if two terms udpate the
// same document, the last one that came in wins, irrespective of the
// terms lexical order.
// we can apply the updates in terms order if we keep an updatesGen (and
// increment it with every update) and attach it to each NumericUpdate. Note
// that we cannot rely only on docIDUpto because an app may send two updates
// which will get same docIDUpto, yet will still need to respect the order
// those updates arrived.
if (!string.Equals(term.Field, currentField, StringComparison.Ordinal))
{
// if we change the code to process updates in terms order, enable this assert
// assert currentField == null || currentField.CompareToOrdinal(term.Field) < 0;
currentField = term.Field;
Terms terms = fields.GetTerms(currentField);
if (terms != null)
{
termsEnum = terms.GetIterator(termsEnum);
}
else
{
termsEnum = null;
continue; // no terms in that field
}
}
if (termsEnum == null)
{
continue;
}
// System.out.println(" term=" + term);
if (termsEnum.SeekExact(term.Bytes))
{
// we don't need term frequencies for this
DocsEnum docsEnum = termsEnum.Docs(rld.LiveDocs, docs, DocsFlags.NONE);
//System.out.println("BDS: got docsEnum=" + docsEnum);
DocValuesFieldUpdates dvUpdates = dvUpdatesContainer.GetUpdates(update.field, update.type);
if (dvUpdates == null)
{
dvUpdates = dvUpdatesContainer.NewUpdates(update.field, update.type, reader.MaxDoc);
}
int doc;
while ((doc = docsEnum.NextDoc()) != DocIdSetIterator.NO_MORE_DOCS)
{
//System.out.println(Thread.currentThread().getName() + " numericDVUpdate term=" + term + " doc=" + docID);
if (doc >= limit)
{
break; // no more docs that can be updated for this term
}
dvUpdates.Add(doc, update.value);
}
}
}
}
}
// Delete by Term
private long ApplyTermDeletes(IEnumerable <Term> termsIter, ReadersAndUpdates rld, SegmentReader reader)
{
lock (this)
{
long delCount = 0;
Fields fields = reader.Fields;
if (fields == null)
{
// this reader has no postings
return(0);
}
TermsEnum termsEnum = null;
string currentField = null;
DocsEnum docs = null;
Debug.Assert(CheckDeleteTerm(null));
bool any = false;
//System.out.println(Thread.currentThread().getName() + " del terms reader=" + reader);
foreach (Term term in termsIter)
{
// Since we visit terms sorted, we gain performance
// by re-using the same TermsEnum and seeking only
// forwards
if (!string.Equals(term.Field, currentField, StringComparison.Ordinal))
{
Debug.Assert(currentField == null || currentField.CompareToOrdinal(term.Field) < 0);
currentField = term.Field;
Terms terms = fields.GetTerms(currentField);
if (terms != null)
{
termsEnum = terms.GetIterator(termsEnum);
}
else
{
termsEnum = null;
}
}
if (termsEnum == null)
{
continue;
}
Debug.Assert(CheckDeleteTerm(term));
// System.out.println(" term=" + term);
if (termsEnum.SeekExact(term.Bytes))
{
// we don't need term frequencies for this
DocsEnum docsEnum = termsEnum.Docs(rld.LiveDocs, docs, DocsFlags.NONE);
//System.out.println("BDS: got docsEnum=" + docsEnum);
if (docsEnum != null)
{
while (true)
{
int docID = docsEnum.NextDoc();
//System.out.println(Thread.currentThread().getName() + " del term=" + term + " doc=" + docID);
if (docID == DocIdSetIterator.NO_MORE_DOCS)
{
break;
}
if (!any)
{
rld.InitWritableLiveDocs();
any = true;
}
// NOTE: there is no limit check on the docID
// when deleting by Term (unlike by Query)
// because on flush we apply all Term deletes to
// each segment. So all Term deleting here is
// against prior segments:
if (rld.Delete(docID))
{
delCount++;
}
}
}
}
}
return(delCount);
}
}
public override TermsEnum GetIterator(TermsEnum reuse)
{
return(m_input.GetIterator(reuse));
}