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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;
import org.apache.lucene.geo.GeoEncodingUtils;
import org.elasticsearch.Version;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.geo.GeoPoint;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Objects;
/**
* Serialization and merge logic for {@link GeoCentroidAggregator}.
*/
public class InternalGeoCentroid extends InternalAggregation implements GeoCentroid {
private final GeoPoint centroid;
private final long count;
public static long encodeLatLon(double lat, double lon) {
return (Integer.toUnsignedLong(GeoEncodingUtils.encodeLatitude(lat)) << 32) |
Integer.toUnsignedLong(GeoEncodingUtils.encodeLongitude(lon));
}
public static double decodeLatitude(long encodedLatLon) {
return GeoEncodingUtils.decodeLatitude((int) (encodedLatLon >>> 32));
}
public static double decodeLongitude(long encodedLatLon) {
return GeoEncodingUtils.decodeLongitude((int) (encodedLatLon & 0xFFFFFFFFL));
}
InternalGeoCentroid(String name, GeoPoint centroid, long count, List
pipelineAggregators, Map metaData) {
super(name, pipelineAggregators, metaData);
assert (centroid == null) == (count == 0);
this.centroid = centroid;
assert count >= 0;
this.count = count;
}
/**
* Read from a stream.
*/
public InternalGeoCentroid(StreamInput in) throws IOException {
super(in);
count = in.readVLong();
if (in.readBoolean()) {
if (in.getVersion().onOrAfter(Version.V_7_2_0)) {
centroid = new GeoPoint(in.readDouble(), in.readDouble());
} else {
final long hash = in.readLong();
centroid = new GeoPoint(decodeLatitude(hash), decodeLongitude(hash));
}
} else {
centroid = null;
}
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeVLong(count);
if (centroid != null) {
out.writeBoolean(true);
if (out.getVersion().onOrAfter(Version.V_7_2_0)) {
out.writeDouble(centroid.lat());
out.writeDouble(centroid.lon());
} else {
out.writeLong(encodeLatLon(centroid.lat(), centroid.lon()));
}
} else {
out.writeBoolean(false);
}
}
@Override
public String getWriteableName() {
return GeoCentroidAggregationBuilder.NAME;
}
@Override
public GeoPoint centroid() {
return centroid;
}
@Override
public long count() {
return count;
}
@Override
public InternalGeoCentroid reduce(List aggregations, ReduceContext reduceContext) {
double lonSum = Double.NaN;
double latSum = Double.NaN;
int totalCount = 0;
for (InternalAggregation aggregation : aggregations) {
InternalGeoCentroid centroidAgg = (InternalGeoCentroid) aggregation;
if (centroidAgg.count > 0) {
totalCount += centroidAgg.count;
if (Double.isNaN(lonSum)) {
lonSum = centroidAgg.count * centroidAgg.centroid.getLon();
latSum = centroidAgg.count * centroidAgg.centroid.getLat();
} else {
lonSum += (centroidAgg.count * centroidAgg.centroid.getLon());
latSum += (centroidAgg.count * centroidAgg.centroid.getLat());
}
}
}
final GeoPoint result = (Double.isNaN(lonSum)) ? null : new GeoPoint(latSum/totalCount, lonSum/totalCount);
return new InternalGeoCentroid(name, result, totalCount, pipelineAggregators(), getMetaData());
}
@Override
public Object getProperty(List path) {
if (path.isEmpty()) {
return this;
} else if (path.size() == 1) {
String coordinate = path.get(0);
switch (coordinate) {
case "value":
return centroid;
case "lat":
return centroid.lat();
case "lon":
return centroid.lon();
case "count":
return count;
default:
throw new IllegalArgumentException("Found unknown path element [" + coordinate + "] in [" + getName() + "]");
}
} else {
throw new IllegalArgumentException("path not supported for [" + getName() + "]: " + path);
}
}
static class Fields {
static final ParseField CENTROID = new ParseField("location");
static final ParseField COUNT = new ParseField("count");
static final ParseField CENTROID_LAT = new ParseField("lat");
static final ParseField CENTROID_LON = new ParseField("lon");
}
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
if (centroid != null) {
builder.startObject(Fields.CENTROID.getPreferredName());
{
builder.field(Fields.CENTROID_LAT.getPreferredName(), centroid.lat());
builder.field(Fields.CENTROID_LON.getPreferredName(), centroid.lon());
}
builder.endObject();
}
builder.field(Fields.COUNT.getPreferredName(), count);
return builder;
}
@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;
InternalGeoCentroid that = (InternalGeoCentroid) obj;
return count == that.count &&
Objects.equals(centroid, that.centroid);
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), centroid, count);
}
@Override
public String toString() {
return "InternalGeoCentroid{" +
"centroid=" + centroid +
", count=" + count +
'}';
}
}