![Marty Schoch](/assets/img/avatar_default.png)
New field type GeoPointField, or "geopoint" in mapping JSON. Currently structs and maps are considered when a mapping explicitly marks a field as type "geopoint". Several variants of "lon", "lng", and "lat" are looked for in map keys, struct field names, or method names. New query type GeoBoundingBoxQuery searches for documents which have a GeoPointField indexed with a value that is inside the specified bounding box. New query type GeoDistanceQuery searches for documents which have a GeoPointField indexed with a value that is less than or equal to the specified distance from the specified location. New sort by method "geo_distance". Hits can be sorted by their distance from the specified location. New geo utility package with all routines ported from Lucene. New FilteringSearcher, which wraps an existing Searcher, but filters all hits with a user-provided callback.
140 lines
4.1 KiB
Go
140 lines
4.1 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 searcher
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import (
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"github.com/blevesearch/bleve/geo"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/numeric"
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"github.com/blevesearch/bleve/search"
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)
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type GeoPointDistanceSearcher struct {
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indexReader index.IndexReader
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field string
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centerLon float64
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centerLat float64
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dist float64
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options search.SearcherOptions
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searcher *FilteringSearcher
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}
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func NewGeoPointDistanceSearcher(indexReader index.IndexReader, centerLon, centerLat, dist float64, field string, boost float64, options search.SearcherOptions) (*GeoPointDistanceSearcher, error) {
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rv := &GeoPointDistanceSearcher{
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indexReader: indexReader,
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centerLon: centerLon,
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centerLat: centerLat,
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dist: dist,
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field: field,
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options: options,
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}
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// compute bounding box containing the circle
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topLeftLon, topLeftLat, bottomRightLon, bottomRightLat := geo.ComputeBoundingBox(centerLon, centerLat, dist)
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var boxSearcher search.Searcher
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if bottomRightLon < topLeftLon {
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// cross date line, rewrite as two parts
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leftSearcher, err := NewGeoBoundingBoxSearcher(indexReader, -180, bottomRightLat, bottomRightLon, topLeftLat, field, boost, options)
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if err != nil {
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return nil, err
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}
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rightSearcher, err := NewGeoBoundingBoxSearcher(indexReader, topLeftLon, bottomRightLat, 180, topLeftLat, field, boost, options)
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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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boxSearcher, err = NewDisjunctionSearcher(indexReader, []search.Searcher{leftSearcher, rightSearcher}, 0, options)
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if err != nil {
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_ = leftSearcher.Close()
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_ = rightSearcher.Close()
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return nil, err
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}
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} else {
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// build geoboundinggox searcher for that bounding box
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var err error
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boxSearcher, err = NewGeoBoundingBoxSearcher(indexReader, topLeftLon, bottomRightLat, bottomRightLon, topLeftLat, field, boost, options)
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if err != nil {
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return nil, err
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}
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}
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// wrap it in a filtering searcher which checks the actual distance
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rv.searcher = NewFilteringSearcher(boxSearcher, func(d *search.DocumentMatch) bool {
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var lon, lat float64
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var found bool
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err := indexReader.DocumentVisitFieldTerms(d.IndexInternalID, []string{field}, func(field string, term []byte) {
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// only consider the values which are shifted 0
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prefixCoded := numeric.PrefixCoded(term)
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shift, err := prefixCoded.Shift()
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if err == nil && shift == 0 {
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i64, err := prefixCoded.Int64()
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if err == nil {
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lon = geo.MortonUnhashLon(uint64(i64))
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lat = geo.MortonUnhashLat(uint64(i64))
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found = true
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}
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}
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})
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if err == nil && found {
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dist := geo.Haversin(lon, lat, rv.centerLon, rv.centerLat)
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if dist <= rv.dist/1000 {
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return true
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}
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}
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return false
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})
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return rv, nil
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}
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func (s *GeoPointDistanceSearcher) Count() uint64 {
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return s.searcher.Count()
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}
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func (s *GeoPointDistanceSearcher) Weight() float64 {
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return s.searcher.Weight()
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}
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func (s *GeoPointDistanceSearcher) SetQueryNorm(qnorm float64) {
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s.searcher.SetQueryNorm(qnorm)
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}
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func (s *GeoPointDistanceSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
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return s.searcher.Next(ctx)
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}
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func (s *GeoPointDistanceSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
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return s.searcher.Advance(ctx, ID)
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}
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func (s *GeoPointDistanceSearcher) Close() error {
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return s.searcher.Close()
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}
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func (s *GeoPointDistanceSearcher) Min() int {
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return 0
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}
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func (s *GeoPointDistanceSearcher) DocumentMatchPoolSize() int {
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return s.searcher.DocumentMatchPoolSize()
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}
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