org.elasticsearch.index.query.GeoPolygonFilterParser Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon 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.index.query;
import com.google.common.collect.Lists;
import org.apache.lucene.search.Filter;
import org.elasticsearch.common.geo.GeoHashUtils;
import org.elasticsearch.common.geo.GeoPoint;
import org.elasticsearch.common.geo.GeoUtils;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.cache.filter.support.CacheKeyFilter;
import org.elasticsearch.index.fielddata.IndexGeoPointFieldData;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.geo.GeoPointFieldMapper;
import org.elasticsearch.index.search.geo.GeoPolygonFilter;
import java.io.IOException;
import java.util.List;
import static org.elasticsearch.index.query.support.QueryParsers.wrapSmartNameFilter;
/**
*
* {
* "pin.location" : {
* "points" : [
* { "lat" : 12, "lon" : 40},
* {}
* ]
* }
* }
*
*/
public class GeoPolygonFilterParser implements FilterParser {
public static final String NAME = "geo_polygon";
@Inject
public GeoPolygonFilterParser() {
}
@Override
public String[] names() {
return new String[]{NAME, "geoPolygon"};
}
@Override
public Filter parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
boolean cache = false;
CacheKeyFilter.Key cacheKey = null;
String fieldName = null;
List points = Lists.newArrayList();
boolean normalizeLon = true;
boolean normalizeLat = true;
String filterName = null;
String currentFieldName = null;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
fieldName = currentFieldName;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_ARRAY) {
if ("points".equals(currentFieldName)) {
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_ARRAY) {
token = parser.nextToken();
double lon = parser.doubleValue();
token = parser.nextToken();
double lat = parser.doubleValue();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
}
points.add(new GeoPoint(lat, lon));
} else if (token == XContentParser.Token.START_OBJECT) {
GeoPoint point = new GeoPoint();
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token.isValue()) {
if (currentFieldName.equals(GeoPointFieldMapper.Names.LAT)) {
point.resetLat(parser.doubleValue());
} else if (currentFieldName.equals(GeoPointFieldMapper.Names.LON)) {
point.resetLon(parser.doubleValue());
} else if (currentFieldName.equals(GeoPointFieldMapper.Names.GEOHASH)) {
GeoHashUtils.decode(parser.text(), point);
}
}
}
points.add(point);
} else if (token.isValue()) {
points.add(new GeoPoint().resetFromString(parser.text()));
}
}
} else {
throw new QueryParsingException(parseContext.index(), "[geo_polygon] filter does not support [" + currentFieldName + "]");
}
}
}
} else if (token.isValue()) {
if ("_name".equals(currentFieldName)) {
filterName = parser.text();
} else if ("_cache".equals(currentFieldName)) {
cache = parser.booleanValue();
} else if ("_cache_key".equals(currentFieldName) || "_cacheKey".equals(currentFieldName)) {
cacheKey = new CacheKeyFilter.Key(parser.text());
} else if ("normalize".equals(currentFieldName)) {
normalizeLat = parser.booleanValue();
normalizeLon = parser.booleanValue();
} else {
throw new QueryParsingException(parseContext.index(), "[geo_polygon] filter does not support [" + currentFieldName + "]");
}
}
}
if (points.isEmpty()) {
throw new QueryParsingException(parseContext.index(), "no points defined for geo_polygon filter");
}
if (normalizeLat || normalizeLon) {
for (GeoPoint point : points) {
GeoUtils.normalizePoint(point, normalizeLat, normalizeLon);
}
}
MapperService.SmartNameFieldMappers smartMappers = parseContext.smartFieldMappers(fieldName);
if (smartMappers == null || !smartMappers.hasMapper()) {
throw new QueryParsingException(parseContext.index(), "failed to find geo_point field [" + fieldName + "]");
}
FieldMapper mapper = smartMappers.mapper();
if (!(mapper instanceof GeoPointFieldMapper.GeoStringFieldMapper)) {
throw new QueryParsingException(parseContext.index(), "field [" + fieldName + "] is not a geo_point field");
}
IndexGeoPointFieldData indexFieldData = parseContext.fieldData().getForField(mapper);
Filter filter = new GeoPolygonFilter(points.toArray(new GeoPoint[points.size()]), indexFieldData);
if (cache) {
filter = parseContext.cacheFilter(filter, cacheKey);
}
filter = wrapSmartNameFilter(filter, smartMappers, parseContext);
if (filterName != null) {
parseContext.addNamedFilter(filterName, filter);
}
return filter;
}
}