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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.fielddata.fieldcomparator;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.index.SortedNumericDocValues;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.FieldComparator;
import org.apache.lucene.search.SortField;
import org.apache.lucene.util.BitSet;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.index.fielddata.LeafNumericFieldData;
import org.elasticsearch.index.fielddata.FieldData;
import org.elasticsearch.index.fielddata.IndexFieldData;
import org.elasticsearch.index.fielddata.IndexNumericFieldData;
import org.elasticsearch.index.fielddata.plain.SortedNumericDVIndexFieldData;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.MultiValueMode;
import org.elasticsearch.search.sort.BucketedSort;
import org.elasticsearch.search.sort.SortOrder;
import java.io.IOException;
import java.util.function.Function;
/**
* Comparator source for long values.
*/
public class LongValuesComparatorSource extends IndexFieldData.XFieldComparatorSource {
private final IndexNumericFieldData indexFieldData;
private final Function converter;
public LongValuesComparatorSource(IndexNumericFieldData indexFieldData, @Nullable Object missingValue,
MultiValueMode sortMode, Nested nested) {
this(indexFieldData, missingValue, sortMode, nested, null);
}
public LongValuesComparatorSource(IndexNumericFieldData indexFieldData, @Nullable Object missingValue,
MultiValueMode sortMode, Nested nested,
Function converter) {
super(missingValue, sortMode, nested);
this.indexFieldData = indexFieldData;
this.converter = converter;
}
@Override
public SortField.Type reducedType() {
return SortField.Type.LONG;
}
private SortedNumericDocValues loadDocValues(LeafReaderContext context) {
final LeafNumericFieldData data = indexFieldData.load(context);
SortedNumericDocValues values;
if (data instanceof SortedNumericDVIndexFieldData.NanoSecondFieldData) {
values = ((SortedNumericDVIndexFieldData.NanoSecondFieldData) data).getLongValuesAsNanos();
} else {
values = data.getLongValues();
}
return converter != null ? converter.apply(values) : values;
}
private NumericDocValues getNumericDocValues(LeafReaderContext context, long missingValue) throws IOException {
final SortedNumericDocValues values = loadDocValues(context);
if (nested == null) {
return FieldData.replaceMissing(sortMode.select(values), missingValue);
}
final BitSet rootDocs = nested.rootDocs(context);
final DocIdSetIterator innerDocs = nested.innerDocs(context);
final int maxChildren = nested.getNestedSort() != null ? nested.getNestedSort().getMaxChildren() : Integer.MAX_VALUE;
return sortMode.select(values, missingValue, rootDocs, innerDocs, context.reader().maxDoc(), maxChildren);
}
@Override
public FieldComparator newComparator(String fieldname, int numHits, int sortPos, boolean reversed) {
assert indexFieldData == null || fieldname.equals(indexFieldData.getFieldName());
final long lMissingValue = (Long) missingObject(missingValue, reversed);
// NOTE: it's important to pass null as a missing value in the constructor so that
// the comparator doesn't check docsWithField since we replace missing values in select()
return new FieldComparator.LongComparator(numHits, null, null) {
@Override
protected NumericDocValues getNumericDocValues(LeafReaderContext context, String field) throws IOException {
return LongValuesComparatorSource.this.getNumericDocValues(context, lMissingValue);
}
};
}
@Override
public BucketedSort newBucketedSort(BigArrays bigArrays, SortOrder sortOrder, DocValueFormat format,
int bucketSize, BucketedSort.ExtraData extra) {
return new BucketedSort.ForLongs(bigArrays, sortOrder, format, bucketSize, extra) {
private final long lMissingValue = (Long) missingObject(missingValue, sortOrder == SortOrder.DESC);
@Override
public Leaf forLeaf(LeafReaderContext ctx) throws IOException {
return new Leaf(ctx) {
private final NumericDocValues docValues = getNumericDocValues(ctx, lMissingValue);
private long docValue;
@Override
protected boolean advanceExact(int doc) throws IOException {
if (docValues.advanceExact(doc)) {
docValue = docValues.longValue();
return true;
}
return false;
}
@Override
protected long docValue() {
return docValue;
}
};
}
};
}
}