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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.geocentroid;
import org.apache.lucene.spatial.geopoint.document.GeoPointField;
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;
/**
* Serialization and merge logic for {@link GeoCentroidAggregator}.
*/
public class InternalGeoCentroid extends InternalAggregation implements GeoCentroid {
protected final GeoPoint centroid;
protected final long count;
InternalGeoCentroid(String name, GeoPoint centroid, long count, List<PipelineAggregator>
pipelineAggregators, Map<String, Object> 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()) {
final long hash = in.readLong();
centroid = new GeoPoint(GeoPointField.decodeLatitude(hash), GeoPointField.decodeLongitude(hash));
} else {
centroid = null;
}
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeVLong(count);
if (centroid != null) {
out.writeBoolean(true);
// should we just write lat and lon separately?
out.writeLong(GeoPointField.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 doReduce(List<InternalAggregation> 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<String> 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();
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 String CENTROID = "location";
}
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
if (centroid != null) {
builder.startObject(Fields.CENTROID).field("lat", centroid.lat()).field("lon", centroid.lon()).endObject();
}
return builder;
}
}
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