/*
* 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.index.search.geo;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.FieldComparator;
import org.apache.lucene.search.SortField;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.index.cache.field.data.FieldDataCache;
import org.elasticsearch.index.field.data.FieldDataType;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.geo.GeoPointFieldData;
import org.elasticsearch.index.mapper.geo.GeoPointFieldDataType;
import java.io.IOException;
/**
* @author kimchy (shay.banon)
*/
// LUCENE MONITOR: Monitor against FieldComparator.Double
public class GeoDistanceDataComparator extends FieldComparator {
public static FieldDataType.ExtendedFieldComparatorSource comparatorSource(String fieldName, double lat, double lon, DistanceUnit unit, GeoDistance geoDistance,
FieldDataCache fieldDataCache, MapperService mapperService) {
return new InnerSource(fieldName, lat, lon, unit, geoDistance, fieldDataCache, mapperService);
}
static class InnerSource extends FieldDataType.ExtendedFieldComparatorSource {
protected final String fieldName;
protected final double lat;
protected final double lon;
protected final DistanceUnit unit;
protected final GeoDistance geoDistance;
protected final FieldDataCache fieldDataCache;
private final MapperService mapperService;
private InnerSource(String fieldName, double lat, double lon, DistanceUnit unit, GeoDistance geoDistance,
FieldDataCache fieldDataCache, MapperService mapperService) {
this.fieldName = fieldName;
this.lat = lat;
this.lon = lon;
this.unit = unit;
this.geoDistance = geoDistance;
this.fieldDataCache = fieldDataCache;
this.mapperService = mapperService;
}
@Override public FieldComparator newComparator(String fieldname, int numHits, int sortPos, boolean reversed) throws IOException {
return new GeoDistanceDataComparator(numHits, fieldname, lat, lon, unit, geoDistance, fieldDataCache, mapperService);
}
@Override public int reducedType() {
return SortField.DOUBLE;
}
}
protected final String fieldName;
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;
private final double[] values;
private double bottom;
public GeoDistanceDataComparator(int numHits, String fieldName, double lat, double lon, DistanceUnit unit, GeoDistance geoDistance,
FieldDataCache fieldDataCache, MapperService mapperService) {
values = new double[numHits];
this.fieldName = fieldName;
this.lat = lat;
this.lon = lon;
this.unit = unit;
this.geoDistance = geoDistance;
this.fieldDataCache = fieldDataCache;
FieldMapper mapper = mapperService.smartNameFieldMapper(fieldName);
if (mapper == null) {
throw new ElasticSearchIllegalArgumentException("No mapping found for field [" + fieldName + "] for geo distance sort");
}
if (mapper.fieldDataType() != GeoPointFieldDataType.TYPE) {
throw new ElasticSearchIllegalArgumentException("field [" + fieldName + "] is not a geo_point field");
}
this.indexFieldName = mapper.names().indexName();
}
@Override public void setNextReader(IndexReader reader, int docBase) throws IOException {
fieldData = (GeoPointFieldData) fieldDataCache.cache(GeoPointFieldDataType.TYPE, reader, indexFieldName);
}
@Override public int compare(int slot1, int slot2) {
final double v1 = values[slot1];
final double v2 = values[slot2];
if (v1 > v2) {
return 1;
} else if (v1 < v2) {
return -1;
} else {
return 0;
}
}
@Override public int compareBottom(int doc) {
double distance;
if (!fieldData.hasValue(doc)) {
// is this true? push this to the "end"
distance = Double.MAX_VALUE;
} else {
distance = geoDistance.calculate(lat, lon, fieldData.latValue(doc), fieldData.lonValue(doc), unit);
}
final double v2 = distance;
if (bottom > v2) {
return 1;
} else if (bottom < v2) {
return -1;
} else {
return 0;
}
}
@Override public void copy(int slot, int doc) {
double distance;
if (!fieldData.hasValue(doc)) {
// is this true? push this to the "end"
distance = Double.MAX_VALUE;
} else {
distance = geoDistance.calculate(lat, lon, fieldData.latValue(doc), fieldData.lonValue(doc), unit);
}
values[slot] = distance;
}
@Override public void setBottom(final int bottom) {
this.bottom = values[bottom];
}
@Override public Comparable value(int slot) {
return Double.valueOf(values[slot]);
}
}