119 lines
3.8 KiB
Go
119 lines
3.8 KiB
Go
// Copyright (c) 2017 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package query
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import (
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"context"
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"fmt"
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"github.com/blevesearch/bleve/v2/geo"
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"github.com/blevesearch/bleve/v2/mapping"
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"github.com/blevesearch/bleve/v2/search"
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"github.com/blevesearch/bleve/v2/search/searcher"
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"github.com/blevesearch/bleve/v2/util"
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index "github.com/blevesearch/bleve_index_api"
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)
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type GeoBoundingBoxQuery struct {
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TopLeft []float64 `json:"top_left,omitempty"`
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BottomRight []float64 `json:"bottom_right,omitempty"`
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FieldVal string `json:"field,omitempty"`
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BoostVal *Boost `json:"boost,omitempty"`
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}
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func NewGeoBoundingBoxQuery(topLeftLon, topLeftLat, bottomRightLon, bottomRightLat float64) *GeoBoundingBoxQuery {
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return &GeoBoundingBoxQuery{
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TopLeft: []float64{topLeftLon, topLeftLat},
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BottomRight: []float64{bottomRightLon, bottomRightLat},
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}
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}
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func (q *GeoBoundingBoxQuery) SetBoost(b float64) {
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boost := Boost(b)
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q.BoostVal = &boost
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}
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func (q *GeoBoundingBoxQuery) Boost() float64 {
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return q.BoostVal.Value()
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}
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func (q *GeoBoundingBoxQuery) SetField(f string) {
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q.FieldVal = f
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}
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func (q *GeoBoundingBoxQuery) Field() string {
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return q.FieldVal
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}
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func (q *GeoBoundingBoxQuery) Searcher(ctx context.Context, i index.IndexReader, m mapping.IndexMapping, options search.SearcherOptions) (search.Searcher, error) {
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field := q.FieldVal
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if q.FieldVal == "" {
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field = m.DefaultSearchField()
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}
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ctx = context.WithValue(ctx, search.QueryTypeKey, search.Geo)
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if q.BottomRight[0] < q.TopLeft[0] {
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// cross date line, rewrite as two parts
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leftSearcher, err := searcher.NewGeoBoundingBoxSearcher(ctx, i, -180, q.BottomRight[1], q.BottomRight[0], q.TopLeft[1], field, q.BoostVal.Value(), options, true)
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if err != nil {
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return nil, err
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}
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rightSearcher, err := searcher.NewGeoBoundingBoxSearcher(ctx, i, q.TopLeft[0], q.BottomRight[1], 180, q.TopLeft[1], field, q.BoostVal.Value(), options, true)
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if err != nil {
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_ = leftSearcher.Close()
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return nil, err
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}
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return searcher.NewDisjunctionSearcher(ctx, i, []search.Searcher{leftSearcher, rightSearcher}, 0, options)
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}
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return searcher.NewGeoBoundingBoxSearcher(ctx, i, q.TopLeft[0], q.BottomRight[1], q.BottomRight[0], q.TopLeft[1], field, q.BoostVal.Value(), options, true)
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}
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func (q *GeoBoundingBoxQuery) Validate() error {
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if q.TopLeft[1] < q.BottomRight[1] {
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return fmt.Errorf("geo bounding box top left should be higher than bottom right")
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}
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return nil
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}
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func (q *GeoBoundingBoxQuery) UnmarshalJSON(data []byte) error {
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tmp := struct {
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TopLeft interface{} `json:"top_left,omitempty"`
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BottomRight interface{} `json:"bottom_right,omitempty"`
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FieldVal string `json:"field,omitempty"`
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BoostVal *Boost `json:"boost,omitempty"`
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}{}
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err := util.UnmarshalJSON(data, &tmp)
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if err != nil {
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return err
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}
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// now use our generic point parsing code from the geo package
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lon, lat, found := geo.ExtractGeoPoint(tmp.TopLeft)
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if !found {
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return fmt.Errorf("geo location top_left not in a valid format")
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}
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q.TopLeft = []float64{lon, lat}
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lon, lat, found = geo.ExtractGeoPoint(tmp.BottomRight)
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if !found {
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return fmt.Errorf("geo location bottom_right not in a valid format")
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}
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q.BottomRight = []float64{lon, lat}
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q.FieldVal = tmp.FieldVal
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q.BoostVal = tmp.BoostVal
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return nil
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}
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