a16efa5e78
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.
138 lines
3.6 KiB
Go
138 lines
3.6 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 document
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import (
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"fmt"
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"github.com/blevesearch/bleve/analysis"
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"github.com/blevesearch/bleve/geo"
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"github.com/blevesearch/bleve/numeric"
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)
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var GeoPrecisionStep uint = 9
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type GeoPointField struct {
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name string
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arrayPositions []uint64
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options IndexingOptions
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value numeric.PrefixCoded
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numPlainTextBytes uint64
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}
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func (n *GeoPointField) Name() string {
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return n.name
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}
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func (n *GeoPointField) ArrayPositions() []uint64 {
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return n.arrayPositions
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}
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func (n *GeoPointField) Options() IndexingOptions {
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return n.options
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}
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func (n *GeoPointField) Analyze() (int, analysis.TokenFrequencies) {
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tokens := make(analysis.TokenStream, 0)
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tokens = append(tokens, &analysis.Token{
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Start: 0,
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End: len(n.value),
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Term: n.value,
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Position: 1,
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Type: analysis.Numeric,
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})
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original, err := n.value.Int64()
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if err == nil {
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shift := GeoPrecisionStep
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for shift < 64 {
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shiftEncoded, err := numeric.NewPrefixCodedInt64(original, shift)
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if err != nil {
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break
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}
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token := analysis.Token{
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Start: 0,
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End: len(shiftEncoded),
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Term: shiftEncoded,
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Position: 1,
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Type: analysis.Numeric,
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}
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tokens = append(tokens, &token)
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shift += GeoPrecisionStep
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}
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}
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fieldLength := len(tokens)
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tokenFreqs := analysis.TokenFrequency(tokens, n.arrayPositions, n.options.IncludeTermVectors())
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return fieldLength, tokenFreqs
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}
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func (n *GeoPointField) Value() []byte {
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return n.value
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}
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func (n *GeoPointField) Lon() (float64, error) {
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i64, err := n.value.Int64()
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if err != nil {
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return 0.0, err
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}
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return geo.MortonUnhashLon(uint64(i64)), nil
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}
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func (n *GeoPointField) Lat() (float64, error) {
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i64, err := n.value.Int64()
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if err != nil {
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return 0.0, err
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}
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return geo.MortonUnhashLat(uint64(i64)), nil
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}
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func (n *GeoPointField) GoString() string {
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return fmt.Sprintf("&document.GeoPointField{Name:%s, Options: %s, Value: %s}", n.name, n.options, n.value)
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}
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func (n *GeoPointField) NumPlainTextBytes() uint64 {
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return n.numPlainTextBytes
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}
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func NewGeoPointFieldFromBytes(name string, arrayPositions []uint64, value []byte) *GeoPointField {
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return &GeoPointField{
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name: name,
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arrayPositions: arrayPositions,
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value: value,
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options: DefaultNumericIndexingOptions,
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numPlainTextBytes: uint64(len(value)),
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}
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}
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func NewGeoPointField(name string, arrayPositions []uint64, lon, lat float64) *GeoPointField {
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return NewGeoPointFieldWithIndexingOptions(name, arrayPositions, lon, lat, DefaultNumericIndexingOptions)
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}
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func NewGeoPointFieldWithIndexingOptions(name string, arrayPositions []uint64, lon, lat float64, options IndexingOptions) *GeoPointField {
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mhash := geo.MortonHash(lon, lat)
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prefixCoded := numeric.MustNewPrefixCodedInt64(int64(mhash), 0)
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return &GeoPointField{
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name: name,
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arrayPositions: arrayPositions,
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value: prefixCoded,
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options: options,
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// not correct, just a place holder until we revisit how fields are
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// represented and can fix this better
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numPlainTextBytes: uint64(8),
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}
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}
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