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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.index.query;
import com.spatial4j.core.shape.Shape;
import org.apache.lucene.search.Filter;
import org.apache.lucene.spatial.prefix.PrefixTreeStrategy;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.common.geo.ShapeRelation;
import org.elasticsearch.common.geo.builders.ShapeBuilder;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.internal.Nullable;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.cache.filter.support.CacheKeyFilter;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.geo.GeoShapeFieldMapper;
import org.elasticsearch.index.search.shape.ShapeFetchService;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import static org.elasticsearch.index.query.support.QueryParsers.wrapSmartNameFilter;
/**
* {@link FilterParser} for filtering Documents based on {@link Shape}s.
*
* Only those fields mapped using {@link GeoShapeFieldMapper} can be filtered
* using this parser.
*
* Format supported:
*
*
* "field" : {
* "relation" : "intersects",
* "shape" : {
* "type" : "polygon",
* "coordinates" : [
* [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ]
* ]
* }
* }
*
*/
public class GeoShapeFilterParser implements FilterParser {
public static final String NAME = "geo_shape";
private ShapeFetchService fetchService;
public static class DEFAULTS {
public static final String INDEX_NAME = "shapes";
public static final String SHAPE_FIELD_NAME = "shape";
}
@Override
public String[] names() {
return new String[]{NAME, "geoShape"};
}
@Override
public Filter parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
XContentParser parser = parseContext.parser();
String fieldName = null;
ShapeRelation shapeRelation = ShapeRelation.INTERSECTS;
String strategyName = null;
ShapeBuilder shape = null;
boolean cache = false;
CacheKeyFilter.Key cacheKey = null;
String filterName = null;
String id = null;
String type = null;
String index = DEFAULTS.INDEX_NAME;
String shapePath = DEFAULTS.SHAPE_FIELD_NAME;
XContentParser.Token token;
String currentFieldName = null;
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();
token = parser.nextToken();
if ("shape".equals(currentFieldName)) {
shape = ShapeBuilder.parse(parser);
} else if ("relation".equals(currentFieldName)) {
shapeRelation = ShapeRelation.getRelationByName(parser.text());
if (shapeRelation == null) {
throw new QueryParsingException(parseContext.index(), "Unknown shape operation [" + parser.text() + "]");
}
} else if ("strategy".equals(currentFieldName)) {
strategyName = parser.text();
} else if ("indexed_shape".equals(currentFieldName) || "indexedShape".equals(currentFieldName)) {
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token.isValue()) {
if ("id".equals(currentFieldName)) {
id = parser.text();
} else if ("type".equals(currentFieldName)) {
type = parser.text();
} else if ("index".equals(currentFieldName)) {
index = parser.text();
} else if ("path".equals(currentFieldName)) {
shapePath = parser.text();
}
}
}
if (id == null) {
throw new QueryParsingException(parseContext.index(), "ID for indexed shape not provided");
} else if (type == null) {
throw new QueryParsingException(parseContext.index(), "Type for indexed shape not provided");
}
GetRequest getRequest = new GetRequest(index, type, id);
getRequest.copyContextAndHeadersFrom(SearchContext.current());
shape = fetchService.fetch(getRequest, shapePath);
} else {
throw new QueryParsingException(parseContext.index(), "[geo_shape] 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 = new CacheKeyFilter.Key(parser.text());
} else {
throw new QueryParsingException(parseContext.index(), "[geo_shape] filter does not support [" + currentFieldName + "]");
}
}
}
if (shape == null) {
throw new QueryParsingException(parseContext.index(), "No Shape defined");
} else if (shapeRelation == null) {
throw new QueryParsingException(parseContext.index(), "No Shape Relation defined");
}
MapperService.SmartNameFieldMappers smartNameFieldMappers = parseContext.smartFieldMappers(fieldName);
if (smartNameFieldMappers == null || !smartNameFieldMappers.hasMapper()) {
throw new QueryParsingException(parseContext.index(), "Failed to find geo_shape field [" + fieldName + "]");
}
FieldMapper fieldMapper = smartNameFieldMappers.mapper();
// TODO: This isn't the nicest way to check this
if (!(fieldMapper instanceof GeoShapeFieldMapper)) {
throw new QueryParsingException(parseContext.index(), "Field [" + fieldName + "] is not a geo_shape");
}
GeoShapeFieldMapper shapeFieldMapper = (GeoShapeFieldMapper) fieldMapper;
PrefixTreeStrategy strategy = shapeFieldMapper.defaultStrategy();
if (strategyName != null) {
strategy = shapeFieldMapper.resolveStrategy(strategyName);
}
Filter filter = strategy.makeFilter(GeoShapeQueryParser.getArgs(shape, shapeRelation));
if (cache) {
filter = parseContext.cacheFilter(filter, cacheKey);
}
filter = wrapSmartNameFilter(filter, smartNameFieldMappers, parseContext);
if (filterName != null) {
parseContext.addNamedFilter(filterName, filter);
}
return filter;
}
@Inject(optional = true)
public void setFetchService(@Nullable ShapeFetchService fetchService) {
this.fetchService = fetchService;
}
}