/*
* 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.sort;
import org.apache.lucene.search.SortField;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.geo.GeoPointFieldMapper;
import org.elasticsearch.index.search.geo.GeoDistance;
import org.elasticsearch.index.search.geo.GeoDistanceDataComparator;
import org.elasticsearch.index.search.geo.GeoHashUtils;
import org.elasticsearch.search.internal.SearchContext;
/**
* @author kimchy (shay.banon)
*/
public class GeoDistanceSortParser implements SortParser {
@Override public String[] names() {
return new String[]{"_geo_distance", "_geoDistance"};
}
@Override public SortField parse(XContentParser parser, SearchContext context) throws Exception {
String fieldName = null;
double lat = Double.NaN;
double lon = Double.NaN;
DistanceUnit unit = DistanceUnit.KILOMETERS;
GeoDistance geoDistance = GeoDistance.ARC;
boolean reverse = false;
XContentParser.Token token;
String currentName = parser.currentName();
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentName = parser.currentName();
} else if (token == XContentParser.Token.START_ARRAY) {
token = parser.nextToken();
lon = parser.doubleValue();
token = parser.nextToken();
lat = parser.doubleValue();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
}
fieldName = currentName;
} else if (token == XContentParser.Token.START_OBJECT) {
// the json in the format of -> field : { lat : 30, lon : 12 }
fieldName = currentName;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentName = parser.currentName();
} else if (token.isValue()) {
if (currentName.equals(GeoPointFieldMapper.Names.LAT)) {
lat = parser.doubleValue();
} else if (currentName.equals(GeoPointFieldMapper.Names.LON)) {
lon = parser.doubleValue();
} else if (currentName.equals(GeoPointFieldMapper.Names.GEOHASH)) {
double[] values = GeoHashUtils.decode(parser.text());
lat = values[0];
lon = values[1];
}
}
}
} else if (token.isValue()) {
if ("reverse".equals(currentName)) {
reverse = parser.booleanValue();
} else if ("order".equals(currentName)) {
reverse = "desc".equals(parser.text());
} else if (currentName.equals("unit")) {
unit = DistanceUnit.fromString(parser.text());
} else if (currentName.equals("distance_type") || currentName.equals("distanceType")) {
geoDistance = GeoDistance.fromString(parser.text());
} else {
// assume the value is the actual value
String value = parser.text();
int comma = value.indexOf(',');
if (comma != -1) {
lat = Double.parseDouble(value.substring(0, comma).trim());
lon = Double.parseDouble(value.substring(comma + 1).trim());
} else {
double[] values = GeoHashUtils.decode(value);
lat = values[0];
lon = values[1];
}
fieldName = currentName;
}
}
}
return new SortField(fieldName, GeoDistanceDataComparator.comparatorSource(fieldName, lat, lon, unit, geoDistance, context.fieldDataCache(), context.mapperService()), reverse);
}
}