6507e31787
also added flag for bounding box searcher to optionally not check boundaries. this is useful when other searchers are going to check every point anyway by some other criteria.
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, false)
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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, false)
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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, false)
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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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