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Apache Lucene (module: facet)
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/*
* 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.
*/
package org.apache.lucene.facet.range;
import java.io.IOException;
import java.util.List;
import org.apache.lucene.facet.Facets;
import org.apache.lucene.facet.FacetsCollector;
import org.apache.lucene.facet.FacetsCollector.MatchingDocs;
import org.apache.lucene.facet.MultiLongValues;
import org.apache.lucene.facet.MultiLongValuesSource;
import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.index.SortedNumericDocValues;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.LongValues;
import org.apache.lucene.search.LongValuesSource;
import org.apache.lucene.search.Query;
/**
* {@link Facets} implementation that computes counts for dynamic long ranges. Use this for
* dimensions that change in real-time (e.g. a relative time based dimension like "Past day", "Past
* 2 days", etc.) or that change for each request (e.g. distance from the user's location, "< 1
* km", "< 2 km", etc.).
*
* @lucene.experimental
*/
public class LongRangeFacetCounts extends RangeFacetCounts {
/**
* Create {@code LongRangeFacetCounts} using long values from the specified field. The field may
* be single-valued ({@link NumericDocValues}) or multi-valued ({@link SortedNumericDocValues}),
* and will be interpreted as containing long values.
*/
public LongRangeFacetCounts(String field, FacetsCollector hits, LongRange... ranges)
throws IOException {
this(field, (LongValuesSource) null, hits, ranges);
}
/**
* Create {@code LongRangeFacetCounts}, using the provided {@link LongValuesSource} if non-null.
* If {@code valueSource} is null, doc values from the provided {@code field} will be used.
*/
public LongRangeFacetCounts(
String field, LongValuesSource valueSource, FacetsCollector hits, LongRange... ranges)
throws IOException {
this(field, valueSource, hits, null, ranges);
}
/**
* Create {@code LongRangeFacetCounts}, using the provided {@link MultiLongValuesSource} if
* non-null. If {@code valuesSource} is null, doc values from the provided {@code field} will be
* used.
*/
public LongRangeFacetCounts(
String field, MultiLongValuesSource valuesSource, FacetsCollector hits, LongRange... ranges)
throws IOException {
this(field, valuesSource, hits, null, ranges);
}
/**
* Create {@code LongRangeFacetCounts}, using the provided {@link LongValuesSource} if non-null.
* If {@code valueSource} is null, doc values from the provided {@code field} will be used. Use
* the provided {@code Query} as a fastmatch: only documents passing the filter are checked for
* the matching ranges, which is helpful when the provided {@link LongValuesSource} is costly
* per-document, such as a geo distance.
*/
public LongRangeFacetCounts(
String field,
LongValuesSource valueSource,
FacetsCollector hits,
Query fastMatchQuery,
LongRange... ranges)
throws IOException {
super(field, ranges, fastMatchQuery);
// use the provided valueSource if non-null, otherwise use the doc values associated with the
// field
if (valueSource != null) {
count(valueSource, hits.getMatchingDocs());
} else {
count(field, hits.getMatchingDocs());
}
}
/**
* Create {@code LongRangeFacetCounts}, using the provided {@link MultiLongValuesSource} if
* non-null. If {@code valuesSource} is null, doc values from the provided {@code field} will be
* used. Use the provided {@code Query} as a fastmatch: only documents passing the filter are
* checked for the matching ranges, which is helpful when the provided {@link LongValuesSource} is
* costly per-document, such as a geo distance.
*/
public LongRangeFacetCounts(
String field,
MultiLongValuesSource valuesSource,
FacetsCollector hits,
Query fastMatchQuery,
LongRange... ranges)
throws IOException {
super(field, ranges, fastMatchQuery);
// use the provided valueSource if non-null, otherwise use the doc values associated with the
// field
if (valuesSource != null) {
LongValuesSource singleValues = MultiLongValuesSource.unwrapSingleton(valuesSource);
if (singleValues != null) {
count(singleValues, hits.getMatchingDocs());
} else {
count(valuesSource, hits.getMatchingDocs());
}
} else {
count(field, hits.getMatchingDocs());
}
}
/** Counts from the provided valueSource. */
private void count(LongValuesSource valueSource, List matchingDocs)
throws IOException {
LongRangeCounter counter = null;
int missingCount = 0;
for (MatchingDocs hits : matchingDocs) {
if (hits.totalHits() == 0) {
continue;
}
final DocIdSetIterator it = createIterator(hits);
if (it == null) {
continue;
}
if (counter == null) {
counter = setupCounter();
}
LongValues fv = valueSource.getValues(hits.context(), null);
totCount += hits.totalHits();
for (int doc = it.nextDoc(); doc != DocIdSetIterator.NO_MORE_DOCS; ) {
// Skip missing docs:
if (fv.advanceExact(doc)) {
counter.addSingleValued(fv.longValue());
} else {
missingCount++;
}
doc = it.nextDoc();
}
}
if (counter != null) {
missingCount += counter.finish();
totCount -= missingCount;
}
}
/** Counts from the provided valueSource. */
private void count(MultiLongValuesSource valueSource, List matchingDocs)
throws IOException {
LongRangeCounter counter = null;
for (MatchingDocs hits : matchingDocs) {
if (hits.totalHits() == 0) {
continue;
}
final DocIdSetIterator it = createIterator(hits);
if (it == null) {
continue;
}
if (counter == null) {
counter = setupCounter();
}
MultiLongValues multiValues = valueSource.getValues(hits.context());
for (int doc = it.nextDoc(); doc != DocIdSetIterator.NO_MORE_DOCS; ) {
// Skip missing docs:
if (multiValues.advanceExact(doc)) {
long limit = multiValues.getValueCount();
// optimize single-valued case:
if (limit == 1) {
counter.addSingleValued(multiValues.nextValue());
totCount++;
} else {
counter.startMultiValuedDoc();
long previous = 0;
for (int i = 0; i < limit; i++) {
long val = multiValues.nextValue();
if (i == 0 || val != previous) {
counter.addMultiValued(val);
previous = val;
}
}
if (counter.endMultiValuedDoc()) {
totCount++;
}
}
}
doc = it.nextDoc();
}
}
if (counter != null) {
int missingCount = counter.finish();
totCount -= missingCount;
}
}
@Override
protected LongRange[] getLongRanges() {
return (LongRange[]) this.ranges;
}
}