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field_geopoint.go
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/
field_geopoint.go
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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 document
import (
"fmt"
"reflect"
"github.com/ltraniello/bleve/v2/analysis"
"github.com/ltraniello/bleve/v2/geo"
"github.com/ltraniello/bleve/v2/numeric"
"github.com/ltraniello/bleve/v2/size"
index "github.com/blevesearch/bleve_index_api"
)
var reflectStaticSizeGeoPointField int
func init() {
var f GeoPointField
reflectStaticSizeGeoPointField = int(reflect.TypeOf(f).Size())
}
var GeoPrecisionStep uint = 9
type GeoPointField struct {
name string
arrayPositions []uint64
options index.FieldIndexingOptions
value numeric.PrefixCoded
numPlainTextBytes uint64
length int
frequencies index.TokenFrequencies
spatialplugin index.SpatialAnalyzerPlugin
}
func (n *GeoPointField) Size() int {
return reflectStaticSizeGeoPointField + size.SizeOfPtr +
len(n.name) +
len(n.arrayPositions)*size.SizeOfUint64
}
func (n *GeoPointField) Name() string {
return n.name
}
func (n *GeoPointField) ArrayPositions() []uint64 {
return n.arrayPositions
}
func (n *GeoPointField) Options() index.FieldIndexingOptions {
return n.options
}
func (n *GeoPointField) EncodedFieldType() byte {
return 'g'
}
func (n *GeoPointField) AnalyzedLength() int {
return n.length
}
func (n *GeoPointField) AnalyzedTokenFrequencies() index.TokenFrequencies {
return n.frequencies
}
func (n *GeoPointField) Analyze() {
tokens := make(analysis.TokenStream, 0, 8)
tokens = append(tokens, &analysis.Token{
Start: 0,
End: len(n.value),
Term: n.value,
Position: 1,
Type: analysis.Numeric,
})
if n.spatialplugin != nil {
lat, _ := n.Lat()
lon, _ := n.Lon()
p := &geo.Point{Lat: lat, Lon: lon}
terms := n.spatialplugin.GetIndexTokens(p)
for _, term := range terms {
token := analysis.Token{
Start: 0,
End: len(term),
Term: []byte(term),
Position: 1,
Type: analysis.AlphaNumeric,
}
tokens = append(tokens, &token)
}
} else {
original, err := n.value.Int64()
if err == nil {
shift := GeoPrecisionStep
for shift < 64 {
shiftEncoded, err := numeric.NewPrefixCodedInt64(original, shift)
if err != nil {
break
}
token := analysis.Token{
Start: 0,
End: len(shiftEncoded),
Term: shiftEncoded,
Position: 1,
Type: analysis.Numeric,
}
tokens = append(tokens, &token)
shift += GeoPrecisionStep
}
}
}
n.length = len(tokens)
n.frequencies = analysis.TokenFrequency(tokens, n.arrayPositions, n.options)
}
func (n *GeoPointField) Value() []byte {
return n.value
}
func (n *GeoPointField) Lon() (float64, error) {
i64, err := n.value.Int64()
if err != nil {
return 0.0, err
}
return geo.MortonUnhashLon(uint64(i64)), nil
}
func (n *GeoPointField) Lat() (float64, error) {
i64, err := n.value.Int64()
if err != nil {
return 0.0, err
}
return geo.MortonUnhashLat(uint64(i64)), nil
}
func (n *GeoPointField) GoString() string {
return fmt.Sprintf("&document.GeoPointField{Name:%s, Options: %s, Value: %s}", n.name, n.options, n.value)
}
func (n *GeoPointField) NumPlainTextBytes() uint64 {
return n.numPlainTextBytes
}
func NewGeoPointFieldFromBytes(name string, arrayPositions []uint64, value []byte) *GeoPointField {
return &GeoPointField{
name: name,
arrayPositions: arrayPositions,
value: value,
options: DefaultNumericIndexingOptions,
numPlainTextBytes: uint64(len(value)),
}
}
func NewGeoPointField(name string, arrayPositions []uint64, lon, lat float64) *GeoPointField {
return NewGeoPointFieldWithIndexingOptions(name, arrayPositions, lon, lat, DefaultNumericIndexingOptions)
}
func NewGeoPointFieldWithIndexingOptions(name string, arrayPositions []uint64, lon, lat float64, options index.FieldIndexingOptions) *GeoPointField {
mhash := geo.MortonHash(lon, lat)
prefixCoded := numeric.MustNewPrefixCodedInt64(int64(mhash), 0)
return &GeoPointField{
name: name,
arrayPositions: arrayPositions,
value: prefixCoded,
options: options,
// not correct, just a place holder until we revisit how fields are
// represented and can fix this better
numPlainTextBytes: uint64(8),
}
}
// SetSpatialAnalyzerPlugin implements the
// index.TokenisableSpatialField interface.
func (n *GeoPointField) SetSpatialAnalyzerPlugin(
plugin index.SpatialAnalyzerPlugin) {
n.spatialplugin = plugin
}