/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.facet.geodistance;
import org.apache.lucene.index.IndexReader;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.index.cache.field.data.FieldDataCache;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.geo.GeoPointFieldData;
import org.elasticsearch.index.mapper.geo.GeoPointFieldDataType;
import org.elasticsearch.index.search.geo.GeoDistance;
import org.elasticsearch.search.facet.AbstractFacetCollector;
import org.elasticsearch.search.facet.Facet;
import org.elasticsearch.search.facet.FacetPhaseExecutionException;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
/**
* @author kimchy (shay.banon)
*/
public class GeoDistanceFacetCollector extends AbstractFacetCollector {
protected final String indexFieldName;
protected final double lat;
protected final double lon;
protected final DistanceUnit unit;
protected final GeoDistance geoDistance;
protected final FieldDataCache fieldDataCache;
protected GeoPointFieldData fieldData;
protected final GeoDistanceFacet.Entry[] entries;
protected GeoPointFieldData.ValueInDocProc aggregator;
public GeoDistanceFacetCollector(String facetName, String fieldName, double lat, double lon, DistanceUnit unit, GeoDistance geoDistance,
GeoDistanceFacet.Entry[] entries, SearchContext context) {
super(facetName);
this.lat = lat;
this.lon = lon;
this.unit = unit;
this.entries = entries;
this.geoDistance = geoDistance;
this.fieldDataCache = context.fieldDataCache();
MapperService.SmartNameFieldMappers smartMappers = context.mapperService().smartName(fieldName);
if (smartMappers == null || !smartMappers.hasMapper()) {
throw new FacetPhaseExecutionException(facetName, "No mapping found for field [" + fieldName + "]");
}
if (smartMappers.mapper().fieldDataType() != GeoPointFieldDataType.TYPE) {
throw new FacetPhaseExecutionException(facetName, "field [" + fieldName + "] is not a geo_point field");
}
// add type filter if there is exact doc mapper associated with it
if (smartMappers.hasDocMapper()) {
setFilter(context.filterCache().cache(smartMappers.docMapper().typeFilter()));
}
this.indexFieldName = smartMappers.mapper().names().indexName();
this.aggregator = new Aggregator(lat, lon, geoDistance, unit, entries);
}
@Override protected void doSetNextReader(IndexReader reader, int docBase) throws IOException {
fieldData = (GeoPointFieldData) fieldDataCache.cache(GeoPointFieldDataType.TYPE, reader, indexFieldName);
}
@Override protected void doCollect(int doc) throws IOException {
for (GeoDistanceFacet.Entry entry : entries) {
entry.foundInDoc = false;
}
fieldData.forEachValueInDoc(doc, aggregator);
}
@Override public Facet facet() {
return new InternalGeoDistanceFacet(facetName, entries);
}
public static class Aggregator implements GeoPointFieldData.ValueInDocProc {
protected final double lat;
protected final double lon;
private final GeoDistance geoDistance;
private final DistanceUnit unit;
private final GeoDistanceFacet.Entry[] entries;
public Aggregator(double lat, double lon, GeoDistance geoDistance, DistanceUnit unit, GeoDistanceFacet.Entry[] entries) {
this.lat = lat;
this.lon = lon;
this.geoDistance = geoDistance;
this.unit = unit;
this.entries = entries;
}
@Override public void onValue(int docId, double lat, double lon) {
double distance = geoDistance.calculate(this.lat, this.lon, lat, lon, unit);
for (GeoDistanceFacet.Entry entry : entries) {
if (entry.foundInDoc) {
continue;
}
if (distance >= entry.getFrom() && distance < entry.getTo()) {
entry.foundInDoc = true;
entry.count++;
entry.totalCount++;
entry.total += distance;
if (distance < entry.min) {
entry.min = distance;
}
if (distance > entry.max) {
entry.max = distance;
}
}
}
}
}
}