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There is a newer version: 8.14.0
/*
 * 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.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 class InternalMin extends InternalNumericMetricsAggregation.SingleValue implements Min {
    private final double min;

    public InternalMin(String name, double min, DocValueFormat formatter, Map metadata) {
        super(name, metadata);
        this.min = min;
        this.format = formatter;
    }

    /**
     * Read from a stream.
     */
    public InternalMin(StreamInput in) throws IOException {
        super(in);
        format = in.readNamedWriteable(DocValueFormat.class);
        min = in.readDouble();
    }

    @Override
    protected void doWriteTo(StreamOutput out) throws IOException {
        out.writeNamedWriteable(format);
        out.writeDouble(min);
    }

    @Override
    public String getWriteableName() {
        return MinAggregationBuilder.NAME;
    }

    @Override
    public double value() {
        return min;
    }

    @Override
    public double getValue() {
        return min;
    }

    @Override
    public InternalMin reduce(List aggregations, ReduceContext reduceContext) {
        double min = Double.POSITIVE_INFINITY;
        for (InternalAggregation aggregation : aggregations) {
            min = Math.min(min, ((InternalMin) aggregation).min);
        }
        return new InternalMin(getName(), min, this.format, getMetadata());
    }

    @Override
    public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
        boolean hasValue = Double.isInfinite(min) == false;
        builder.field(CommonFields.VALUE.getPreferredName(), hasValue ? min : null);
        if (hasValue && format != DocValueFormat.RAW) {
            builder.field(CommonFields.VALUE_AS_STRING.getPreferredName(), format.format(min).toString());
        }
        return builder;
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), min);
    }

    @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;
        InternalMin other = (InternalMin) obj;
        return Objects.equals(min, other.min);
    }

}