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// Copyright (c) 2017 Couchbase, Inc.
//
// Licensed 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 query
import (
"encoding/json"
"fmt"
"github.com/blevesearch/bleve/geo"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/mapping"
"github.com/blevesearch/bleve/search"
"github.com/blevesearch/bleve/search/searcher"
)
type GeoDistanceQuery struct {
Location []float64 `json:"location,omitempty"`
Distance string `json:"distance,omitempty"`
FieldVal string `json:"field,omitempty"`
BoostVal *Boost `json:"boost,omitempty"`
}
func NewGeoDistanceQuery(lon, lat float64, distance string) *GeoDistanceQuery {
return &GeoDistanceQuery{
Location: []float64{lon, lat},
Distance: distance,
}
}
func (q *GeoDistanceQuery) SetBoost(b float64) {
boost := Boost(b)
q.BoostVal = &boost
}
func (q *GeoDistanceQuery) Boost() float64 {
return q.BoostVal.Value()
}
func (q *GeoDistanceQuery) SetField(f string) {
q.FieldVal = f
}
func (q *GeoDistanceQuery) Field() string {
return q.FieldVal
}
func (q *GeoDistanceQuery) Searcher(i index.IndexReader, m mapping.IndexMapping,
options search.SearcherOptions) (search.Searcher, error) {
field := q.FieldVal
if q.FieldVal == "" {
field = m.DefaultSearchField()
}
dist, err := geo.ParseDistance(q.Distance)
if err != nil {
return nil, err
}
return searcher.NewGeoPointDistanceSearcher(i, q.Location[0], q.Location[1],
dist, field, q.BoostVal.Value(), options)
}
func (q *GeoDistanceQuery) Validate() error {
return nil
}
func (q *GeoDistanceQuery) UnmarshalJSON(data []byte) error {
tmp := struct {
Location interface{} `json:"location,omitempty"`
Distance string `json:"distance,omitempty"`
FieldVal string `json:"field,omitempty"`
BoostVal *Boost `json:"boost,omitempty"`
}{}
err := json.Unmarshal(data, &tmp)
if err != nil {
return err
}
// now use our generic point parsing code from the geo package
lon, lat, found := geo.ExtractGeoPoint(tmp.Location)
if !found {
return fmt.Errorf("geo location not in a valid format")
}
q.Location = []float64{lon, lat}
q.Distance = tmp.Distance
q.FieldVal = tmp.FieldVal
q.BoostVal = tmp.BoostVal
return nil
}
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