package org.apache.lucene.facet.sortedset;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import org.apache.lucene.facet.FacetResult;
import org.apache.lucene.facet.Facets;
import org.apache.lucene.facet.FacetsCollector;
import org.apache.lucene.facet.FacetsCollector.MatchingDocs;
import org.apache.lucene.facet.FacetsConfig;
import org.apache.lucene.facet.LabelAndValue;
import org.apache.lucene.facet.TopOrdAndIntQueue;
import org.apache.lucene.facet.sortedset.SortedSetDocValuesReaderState.OrdRange;
import org.apache.lucene.index.AtomicReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.MultiDocValues;
import org.apache.lucene.index.MultiDocValues.MultiSortedSetDocValues;
import org.apache.lucene.index.ReaderUtil;
import org.apache.lucene.index.SortedSetDocValues;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.util.BytesRef;
/** Compute facets counts from previously
* indexed {@link SortedSetDocValuesFacetField},
* without require a separate taxonomy index. Faceting is
* a bit slower (~25%), and there is added cost on every
* {@link IndexReader} open to create a new {@link
* SortedSetDocValuesReaderState}. Furthermore, this does
* not support hierarchical facets; only flat (dimension +
* label) facets, but it uses quite a bit less RAM to do
* so.
*
* <p><b>NOTE</b>: this class should be instantiated and
* then used from a single thread, because it holds a
* thread-private instance of {@link SortedSetDocValues}.
*
* <p><b>NOTE:</b>: tie-break is by unicode sort order
*
* @lucene.experimental */
public class SortedSetDocValuesFacetCounts extends Facets {
final SortedSetDocValuesReaderState state;
final SortedSetDocValues dv;
final String field;
final int[] counts;
/** Sparse faceting: returns any dimension that had any
* hits, topCount labels per dimension. */
public SortedSetDocValuesFacetCounts(SortedSetDocValuesReaderState state, FacetsCollector hits)
throws IOException {
this.state = state;
this.field = state.getField();
dv = state.getDocValues();
counts = new int[state.getSize()];
//System.out.println("field=" + field);
count(hits.getMatchingDocs());
}
@Override
public FacetResult getTopChildren(int topN, String dim, String... path) throws IOException {
if (topN <= 0) {
throw new IllegalArgumentException("topN must be > 0 (got: " + topN + ")");
}
if (path.length > 0) {
throw new IllegalArgumentException("path should be 0 length");
}
OrdRange ordRange = state.getOrdRange(dim);
if (ordRange == null) {
throw new IllegalArgumentException("dimension \"" + dim + "\" was not indexed");
}
return getDim(dim, ordRange, topN);
}
private final FacetResult getDim(String dim, OrdRange ordRange, int topN) {
TopOrdAndIntQueue q = null;
int bottomCount = 0;
int dimCount = 0;
int childCount = 0;
TopOrdAndIntQueue.OrdAndValue reuse = null;
//System.out.println("getDim : " + ordRange.start + " - " + ordRange.end);
for(int ord=ordRange.start; ord<=ordRange.end; ord++) {
//System.out.println(" ord=" + ord + " count=" + counts[ord]);
if (counts[ord] > 0) {
dimCount += counts[ord];
childCount++;
if (counts[ord] > bottomCount) {
if (reuse == null) {
reuse = new TopOrdAndIntQueue.OrdAndValue();
}
reuse.ord = ord;
reuse.value = counts[ord];
if (q == null) {
// Lazy init, so we don't create this for the
// sparse case unnecessarily
q = new TopOrdAndIntQueue(topN);
}
reuse = q.insertWithOverflow(reuse);
if (q.size() == topN) {
bottomCount = q.top().value;
}
}
}
}
if (q == null) {
return null;
}
BytesRef scratch = new BytesRef();
LabelAndValue[] labelValues = new LabelAndValue[q.size()];
for(int i=labelValues.length-1;i>=0;i--) {
TopOrdAndIntQueue.OrdAndValue ordAndValue = q.pop();
dv.lookupOrd(ordAndValue.ord, scratch);
String[] parts = FacetsConfig.stringToPath(scratch.utf8ToString());
labelValues[i] = new LabelAndValue(parts[1], ordAndValue.value);
}
return new FacetResult(dim, new String[0], dimCount, labelValues, childCount);
}
/** Does all the "real work" of tallying up the counts. */
private final void count(List<MatchingDocs> matchingDocs) throws IOException {
//System.out.println("ssdv count");
MultiDocValues.OrdinalMap ordinalMap;
// TODO: is this right? really, we need a way to
// verify that this ordinalMap "matches" the leaves in
// matchingDocs...
if (dv instanceof MultiSortedSetDocValues && matchingDocs.size() > 1) {
ordinalMap = ((MultiSortedSetDocValues) dv).mapping;
} else {
ordinalMap = null;
}
IndexReader origReader = state.getOrigReader();
for(MatchingDocs hits : matchingDocs) {
AtomicReader reader = hits.context.reader();
//System.out.println(" reader=" + reader);
// LUCENE-5090: make sure the provided reader context "matches"
// the top-level reader passed to the
// SortedSetDocValuesReaderState, else cryptic
// AIOOBE can happen:
if (ReaderUtil.getTopLevelContext(hits.context).reader() != origReader) {
throw new IllegalStateException("the SortedSetDocValuesReaderState provided to this class does not match the reader being searched; you must create a new SortedSetDocValuesReaderState every time you open a new IndexReader");
}
SortedSetDocValues segValues = reader.getSortedSetDocValues(field);
if (segValues == null) {
continue;
}
DocIdSetIterator docs = hits.bits.iterator();
// TODO: yet another option is to count all segs
// first, only in seg-ord space, and then do a
// merge-sort-PQ in the end to only "resolve to
// global" those seg ords that can compete, if we know
// we just want top K? ie, this is the same algo
// that'd be used for merging facets across shards
// (distributed faceting). but this has much higher
// temp ram req'ts (sum of number of ords across all
// segs)
if (ordinalMap != null) {
int segOrd = hits.context.ord;
int numSegOrds = (int) segValues.getValueCount();
if (hits.totalHits < numSegOrds/10) {
//System.out.println(" remap as-we-go");
// Remap every ord to global ord as we iterate:
int doc;
while ((doc = docs.nextDoc()) != DocIdSetIterator.NO_MORE_DOCS) {
//System.out.println(" doc=" + doc);
segValues.setDocument(doc);
int term = (int) segValues.nextOrd();
while (term != SortedSetDocValues.NO_MORE_ORDS) {
//System.out.println(" segOrd=" + segOrd + " ord=" + term + " globalOrd=" + ordinalMap.getGlobalOrd(segOrd, term));
counts[(int) ordinalMap.getGlobalOrd(segOrd, term)]++;
term = (int) segValues.nextOrd();
}
}
} else {
//System.out.println(" count in seg ord first");
// First count in seg-ord space:
final int[] segCounts = new int[numSegOrds];
int doc;
while ((doc = docs.nextDoc()) != DocIdSetIterator.NO_MORE_DOCS) {
//System.out.println(" doc=" + doc);
segValues.setDocument(doc);
int term = (int) segValues.nextOrd();
while (term != SortedSetDocValues.NO_MORE_ORDS) {
//System.out.println(" ord=" + term);
segCounts[term]++;
term = (int) segValues.nextOrd();
}
}
// Then, migrate to global ords:
for(int ord=0;ord<numSegOrds;ord++) {
int count = segCounts[ord];
if (count != 0) {
//System.out.println(" migrate segOrd=" + segOrd + " ord=" + ord + " globalOrd=" + ordinalMap.getGlobalOrd(segOrd, ord));
counts[(int) ordinalMap.getGlobalOrd(segOrd, ord)] += count;
}
}
}
} else {
// No ord mapping (e.g., single segment index):
// just aggregate directly into counts:
int doc;
while ((doc = docs.nextDoc()) != DocIdSetIterator.NO_MORE_DOCS) {
segValues.setDocument(doc);
int term = (int) segValues.nextOrd();
while (term != SortedSetDocValues.NO_MORE_ORDS) {
counts[term]++;
term = (int) segValues.nextOrd();
}
}
}
}
}
@Override
public Number getSpecificValue(String dim, String... path) {
if (path.length != 1) {
throw new IllegalArgumentException("path must be length=1");
}
int ord = (int) dv.lookupTerm(new BytesRef(FacetsConfig.pathToString(dim, path)));
if (ord < 0) {
return -1;
}
return counts[ord];
}
@Override
public List<FacetResult> getAllDims(int topN) throws IOException {
List<FacetResult> results = new ArrayList<FacetResult>();
for(Map.Entry<String,OrdRange> ent : state.getPrefixToOrdRange().entrySet()) {
FacetResult fr = getDim(ent.getKey(), ent.getValue(), topN);
if (fr != null) {
results.add(fr);
}
}
// Sort by highest count:
Collections.sort(results,
new Comparator<FacetResult>() {
@Override
public int compare(FacetResult a, FacetResult b) {
if (a.value.intValue() > b.value.intValue()) {
return -1;
} else if (b.value.intValue() > a.value.intValue()) {
return 1;
} else {
return a.dim.compareTo(b.dim);
}
}
});
return results;
}
}