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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.search.aggregations.metrics.stats.extended;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentBuilderString;
import org.elasticsearch.search.aggregations.AggregationStreams;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.metrics.stats.InternalStats;
import java.io.IOException;
/**
*
*/
public class InternalExtendedStats extends InternalStats implements ExtendedStats {
public final static Type TYPE = new Type("extended_stats", "estats");
public final static AggregationStreams.Stream STREAM = new AggregationStreams.Stream() {
@Override
public InternalExtendedStats readResult(StreamInput in) throws IOException {
InternalExtendedStats result = new InternalExtendedStats();
result.readFrom(in);
return result;
}
};
public static void registerStreams() {
AggregationStreams.registerStream(STREAM, TYPE.stream());
}
enum Metrics {
count, sum, min, max, avg, sum_of_squares, variance, std_deviation;
public static Metrics resolve(String name) {
return Metrics.valueOf(name);
}
}
private double sumOfSqrs;
InternalExtendedStats() {} // for serialization
public InternalExtendedStats(String name, long count, double sum, double min, double max, double sumOfSqrs) {
super(name, count, sum, min, max);
this.sumOfSqrs = sumOfSqrs;
}
@Override
public Type type() {
return TYPE;
}
@Override
public double value(String name) {
if ("sum_of_squares".equals(name)) {
return sumOfSqrs;
}
if ("variance".equals(name)) {
return getVariance();
}
if ("std_deviation".equals(name)) {
return getStdDeviation();
}
return super.value(name);
}
@Override
public double getSumOfSquares() {
return sumOfSqrs;
}
@Override
public double getVariance() {
return (sumOfSqrs - ((sum * sum) / count)) / count;
}
@Override
public double getStdDeviation() {
return Math.sqrt(getVariance());
}
@Override
protected void mergeOtherStats(InternalStats to, InternalAggregation from) {
((InternalExtendedStats) to).sumOfSqrs += ((InternalExtendedStats) from).sumOfSqrs;
}
@Override
public void readOtherStatsFrom(StreamInput in) throws IOException {
sumOfSqrs = in.readDouble();
}
@Override
protected void writeOtherStatsTo(StreamOutput out) throws IOException {
out.writeDouble(sumOfSqrs);
}
static class Fields {
public static final XContentBuilderString SUM_OF_SQRS = new XContentBuilderString("sum_of_squares");
public static final XContentBuilderString SUM_OF_SQRS_AS_STRING = new XContentBuilderString("sum_of_squares_as_string");
public static final XContentBuilderString VARIANCE = new XContentBuilderString("variance");
public static final XContentBuilderString VARIANCE_AS_STRING = new XContentBuilderString("variance_as_string");
public static final XContentBuilderString STD_DEVIATION = new XContentBuilderString("std_deviation");
public static final XContentBuilderString STD_DEVIATION_AS_STRING = new XContentBuilderString("std_deviation_as_string");
}
@Override
protected XContentBuilder otherStatsToXCotent(XContentBuilder builder, Params params) throws IOException {
builder.field(Fields.SUM_OF_SQRS, count != 0 ? sumOfSqrs : null);
builder.field(Fields.VARIANCE, count != 0 ? getVariance() : null);
builder.field(Fields.STD_DEVIATION, count != 0 ? getStdDeviation() : null);
if (count != 0 && valueFormatter != null) {
builder.field(Fields.SUM_OF_SQRS_AS_STRING, valueFormatter.format(sumOfSqrs));
builder.field(Fields.VARIANCE_AS_STRING, valueFormatter.format(getVariance()));
builder.field(Fields.STD_DEVIATION_AS_STRING, valueFormatter.format(getStdDeviation()));
}
return builder;
}
}