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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.search.aggregations.metrics;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.xcontent.XContentBuilder;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Objects;
public final class InternalCardinality extends InternalNumericMetricsAggregation.SingleValue implements Cardinality {
private final AbstractHyperLogLogPlusPlus counts;
InternalCardinality(String name, AbstractHyperLogLogPlusPlus counts, Map metadata) {
super(name, metadata);
this.counts = counts;
}
/**
* Read from a stream.
*/
public InternalCardinality(StreamInput in) throws IOException {
super(in);
format = in.readNamedWriteable(DocValueFormat.class);
if (in.readBoolean()) {
counts = AbstractHyperLogLogPlusPlus.readFrom(in, BigArrays.NON_RECYCLING_INSTANCE);
} else {
counts = null;
}
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeNamedWriteable(format);
if (counts != null) {
out.writeBoolean(true);
counts.writeTo(0, out);
} else {
out.writeBoolean(false);
}
}
@Override
public String getWriteableName() {
return CardinalityAggregationBuilder.NAME;
}
@Override
public double value() {
return getValue();
}
@Override
public long getValue() {
return counts == null ? 0 : counts.cardinality(0);
}
public AbstractHyperLogLogPlusPlus getCounts() {
return counts;
}
@Override
public InternalAggregation reduce(List aggregations, ReduceContext reduceContext) {
HyperLogLogPlusPlus reduced = null;
for (InternalAggregation aggregation : aggregations) {
final InternalCardinality cardinality = (InternalCardinality) aggregation;
if (cardinality.counts != null) {
if (reduced == null) {
reduced = new HyperLogLogPlusPlus(cardinality.counts.precision(), BigArrays.NON_RECYCLING_INSTANCE, 1);
}
reduced.merge(0, cardinality.counts, 0);
}
}
if (reduced == null) { // all empty
return aggregations.get(0);
} else {
return new InternalCardinality(name, reduced, getMetadata());
}
}
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
final long cardinality = getValue();
builder.field(CommonFields.VALUE.getPreferredName(), cardinality);
return builder;
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), counts == null ? 0 : counts.hashCode(0));
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null || getClass() != obj.getClass()) return false;
if (super.equals(obj) == false) return false;
InternalCardinality other = (InternalCardinality) obj;
if (counts == null) {
return other.counts == null;
}
return counts.equals(0, other.counts, 0);
}
AbstractHyperLogLogPlusPlus getState() {
return counts;
}
}