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/*
* 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.bucket.composite;
import org.apache.lucene.index.IndexReader;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.core.List;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.search.aggregations.bucket.histogram.Histogram;
import org.elasticsearch.search.aggregations.support.CoreValuesSourceType;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.aggregations.support.ValuesSourceRegistry;
import org.elasticsearch.search.aggregations.support.ValuesSourceType;
import org.elasticsearch.search.sort.SortOrder;
import org.elasticsearch.xcontent.ObjectParser;
import org.elasticsearch.xcontent.XContentBuilder;
import org.elasticsearch.xcontent.XContentParser;
import java.io.IOException;
import java.util.Objects;
import java.util.function.LongConsumer;
/**
* A {@link CompositeValuesSourceBuilder} that builds a {@link HistogramValuesSource} from another numeric values source
* using the provided interval.
*/
public class HistogramValuesSourceBuilder extends CompositeValuesSourceBuilder {
@FunctionalInterface
public interface HistogramCompositeSupplier {
CompositeValuesSourceConfig apply(
ValuesSourceConfig config,
double interval,
String name,
boolean hasScript, // probably redundant with the config, but currently we check this two different ways...
String format,
boolean missingBucket,
MissingOrder missingOrder,
SortOrder order
);
}
static final String TYPE = "histogram";
static final ValuesSourceRegistry.RegistryKey REGISTRY_KEY = new ValuesSourceRegistry.RegistryKey<>(
TYPE,
HistogramCompositeSupplier.class
);
private static final ObjectParser PARSER;
static {
PARSER = new ObjectParser<>(HistogramValuesSourceBuilder.TYPE);
PARSER.declareDouble(HistogramValuesSourceBuilder::interval, Histogram.INTERVAL_FIELD);
CompositeValuesSourceParserHelper.declareValuesSourceFields(PARSER);
}
static HistogramValuesSourceBuilder parse(String name, XContentParser parser) throws IOException {
return PARSER.parse(parser, new HistogramValuesSourceBuilder(name), null);
}
public static void register(ValuesSourceRegistry.Builder builder) {
builder.register(
REGISTRY_KEY,
List.of(CoreValuesSourceType.DATE, CoreValuesSourceType.NUMERIC),
(valuesSourceConfig, interval, name, hasScript, format, missingBucket, missingOrder, order) -> {
ValuesSource.Numeric numeric = (ValuesSource.Numeric) valuesSourceConfig.getValuesSource();
final HistogramValuesSource vs = new HistogramValuesSource(numeric, interval);
final MappedFieldType fieldType = valuesSourceConfig.fieldType();
return new CompositeValuesSourceConfig(
name,
fieldType,
vs,
valuesSourceConfig.format(),
order,
missingBucket,
missingOrder,
hasScript,
(
BigArrays bigArrays,
IndexReader reader,
int size,
LongConsumer addRequestCircuitBreakerBytes,
CompositeValuesSourceConfig compositeValuesSourceConfig) -> {
final ValuesSource.Numeric numericValuesSource = (ValuesSource.Numeric) compositeValuesSourceConfig.valuesSource();
return new DoubleValuesSource(
bigArrays,
compositeValuesSourceConfig.fieldType(),
numericValuesSource::doubleValues,
compositeValuesSourceConfig.format(),
compositeValuesSourceConfig.missingBucket(),
compositeValuesSourceConfig.missingOrder(),
size,
compositeValuesSourceConfig.reverseMul()
);
}
);
},
false
);
}
private double interval = 0;
public HistogramValuesSourceBuilder(String name) {
super(name);
}
protected HistogramValuesSourceBuilder(StreamInput in) throws IOException {
super(in);
this.interval = in.readDouble();
}
@Override
protected void innerWriteTo(StreamOutput out) throws IOException {
out.writeDouble(interval);
}
@Override
protected void doXContentBody(XContentBuilder builder, Params params) throws IOException {
builder.field(Histogram.INTERVAL_FIELD.getPreferredName(), interval);
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), interval);
}
@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;
HistogramValuesSourceBuilder other = (HistogramValuesSourceBuilder) obj;
return Objects.equals(interval, other.interval);
}
@Override
public String type() {
return TYPE;
}
/**
* Returns the interval that is set on this source
**/
public double interval() {
return interval;
}
/**
* Sets the interval on this source.
**/
public HistogramValuesSourceBuilder interval(double interval) {
if (interval <= 0) {
throw new IllegalArgumentException("[interval] must be greater than 0 for [histogram] source");
}
this.interval = interval;
return this;
}
@Override
protected ValuesSourceType getDefaultValuesSourceType() {
return CoreValuesSourceType.NUMERIC;
}
@Override
protected CompositeValuesSourceConfig innerBuild(ValuesSourceRegistry registry, ValuesSourceConfig config) throws IOException {
return registry.getAggregator(REGISTRY_KEY, config)
.apply(config, interval, name, script() != null, format(), missingBucket(), missingOrder(), order());
}
}