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geometry.go
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geometry.go
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package geojson
import (
"errors"
"github.com/paulmach/orb"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/bsontype"
)
// ErrInvalidGeometry will be returned if a the json of the geometry is invalid.
var ErrInvalidGeometry = errors.New("geojson: invalid geometry")
// A Geometry matches the structure of a GeoJSON Geometry.
type Geometry struct {
Type string `json:"type"`
Coordinates orb.Geometry `json:"coordinates,omitempty"`
Geometries []*Geometry `json:"geometries,omitempty"`
}
// NewGeometry will create a Geometry object but will convert
// the input into a GoeJSON geometry. For example, it will convert
// Rings and Bounds into Polygons.
func NewGeometry(g orb.Geometry) *Geometry {
jg := &Geometry{}
switch g := g.(type) {
case orb.Ring:
jg.Coordinates = orb.Polygon{g}
case orb.Bound:
jg.Coordinates = g.ToPolygon()
case orb.Collection:
for _, c := range g {
jg.Geometries = append(jg.Geometries, NewGeometry(c))
}
jg.Type = g.GeoJSONType()
default:
jg.Coordinates = g
}
if jg.Coordinates != nil {
jg.Type = jg.Coordinates.GeoJSONType()
}
return jg
}
// Geometry returns the orb.Geometry for the geojson Geometry.
// This will convert the "Geometries" into a orb.Collection if applicable.
func (g *Geometry) Geometry() orb.Geometry {
if g.Coordinates != nil {
return g.Coordinates
}
c := make(orb.Collection, 0, len(g.Geometries))
for _, geom := range g.Geometries {
c = append(c, geom.Geometry())
}
return c
}
// MarshalJSON will marshal the geometry into the correct JSON structure.
func (g *Geometry) MarshalJSON() ([]byte, error) {
if g.Coordinates == nil && len(g.Geometries) == 0 {
return []byte(`null`), nil
}
ng := newGeometryMarshallDoc(g)
return marshalJSON(ng)
}
// MarshalBSON will convert the geometry into a BSON document with the structure
// of a GeoJSON Geometry. This function is used when the geometry is the top level
// document to be marshalled.
func (g *Geometry) MarshalBSON() ([]byte, error) {
ng := newGeometryMarshallDoc(g)
return bson.Marshal(ng)
}
// MarshalBSONValue will marshal the geometry into a BSON value
// with the structure of a GeoJSON Geometry.
func (g *Geometry) MarshalBSONValue() (bsontype.Type, []byte, error) {
// implementing MarshalBSONValue allows us to marshal into a null value
// needed to match behavior with the JSON marshalling.
if g.Coordinates == nil && len(g.Geometries) == 0 {
return bsontype.Null, nil, nil
}
ng := newGeometryMarshallDoc(g)
return bson.MarshalValue(ng)
}
func newGeometryMarshallDoc(g *Geometry) *geometryMarshallDoc {
ng := &geometryMarshallDoc{}
switch g := g.Coordinates.(type) {
case orb.Ring:
ng.Coordinates = orb.Polygon{g}
case orb.Bound:
ng.Coordinates = g.ToPolygon()
case orb.Collection:
ng.Geometries = make([]*Geometry, 0, len(g))
for _, c := range g {
ng.Geometries = append(ng.Geometries, NewGeometry(c))
}
ng.Type = g.GeoJSONType()
default:
ng.Coordinates = g
}
if ng.Coordinates != nil {
ng.Type = ng.Coordinates.GeoJSONType()
}
if len(g.Geometries) > 0 {
ng.Geometries = g.Geometries
ng.Type = orb.Collection{}.GeoJSONType()
}
return ng
}
// UnmarshalGeometry decodes the JSON data into a GeoJSON feature.
// Alternately one can call json.Unmarshal(g) directly for the same result.
func UnmarshalGeometry(data []byte) (*Geometry, error) {
g := &Geometry{}
err := unmarshalJSON(data, g)
if err != nil {
return nil, err
}
return g, nil
}
// UnmarshalJSON will unmarshal the correct geometry from the JSON structure.
func (g *Geometry) UnmarshalJSON(data []byte) error {
jg := &jsonGeometry{}
err := unmarshalJSON(data, jg)
if err != nil {
return err
}
switch jg.Type {
case "Point":
p := orb.Point{}
err = unmarshalJSON(jg.Coordinates, &p)
if err != nil {
return err
}
g.Coordinates = p
case "MultiPoint":
mp := orb.MultiPoint{}
err = unmarshalJSON(jg.Coordinates, &mp)
if err != nil {
return err
}
g.Coordinates = mp
case "LineString":
ls := orb.LineString{}
err = unmarshalJSON(jg.Coordinates, &ls)
if err != nil {
return err
}
g.Coordinates = ls
case "MultiLineString":
mls := orb.MultiLineString{}
err = unmarshalJSON(jg.Coordinates, &mls)
if err != nil {
return err
}
g.Coordinates = mls
case "Polygon":
p := orb.Polygon{}
err = unmarshalJSON(jg.Coordinates, &p)
if err != nil {
return err
}
g.Coordinates = p
case "MultiPolygon":
mp := orb.MultiPolygon{}
err = unmarshalJSON(jg.Coordinates, &mp)
if err != nil {
return err
}
g.Coordinates = mp
case "GeometryCollection":
g.Geometries = jg.Geometries
default:
return ErrInvalidGeometry
}
g.Type = g.Geometry().GeoJSONType()
return nil
}
// UnmarshalBSON will unmarshal a BSON document created with bson.Marshal.
func (g *Geometry) UnmarshalBSON(data []byte) error {
bg := &bsonGeometry{}
err := bson.Unmarshal(data, bg)
if err != nil {
return err
}
switch bg.Type {
case "Point":
p := orb.Point{}
err = bg.Coordinates.Unmarshal(&p)
if err != nil {
return err
}
g.Coordinates = p
case "MultiPoint":
mp := orb.MultiPoint{}
err = bg.Coordinates.Unmarshal(&mp)
if err != nil {
return err
}
g.Coordinates = mp
case "LineString":
ls := orb.LineString{}
err = bg.Coordinates.Unmarshal(&ls)
if err != nil {
return err
}
g.Coordinates = ls
case "MultiLineString":
mls := orb.MultiLineString{}
err = bg.Coordinates.Unmarshal(&mls)
if err != nil {
return err
}
g.Coordinates = mls
case "Polygon":
p := orb.Polygon{}
err = bg.Coordinates.Unmarshal(&p)
if err != nil {
return err
}
g.Coordinates = p
case "MultiPolygon":
mp := orb.MultiPolygon{}
err = bg.Coordinates.Unmarshal(&mp)
if err != nil {
return err
}
g.Coordinates = mp
case "GeometryCollection":
g.Geometries = bg.Geometries
default:
return ErrInvalidGeometry
}
g.Type = g.Geometry().GeoJSONType()
return nil
}
// A Point is a helper type that will marshal to/from a GeoJSON Point geometry.
type Point orb.Point
// Geometry will return the orb.Geometry version of the data.
func (p Point) Geometry() orb.Geometry {
return orb.Point(p)
}
// MarshalJSON will convert the Point into a GeoJSON Point geometry.
func (p Point) MarshalJSON() ([]byte, error) {
return marshalJSON(&Geometry{Coordinates: orb.Point(p)})
}
// MarshalBSON will convert the Point into a BSON value following the GeoJSON Point structure.
func (p Point) MarshalBSON() ([]byte, error) {
return bson.Marshal(&Geometry{Coordinates: orb.Point(p)})
}
// UnmarshalJSON will unmarshal the GeoJSON Point geometry.
func (p *Point) UnmarshalJSON(data []byte) error {
g := &Geometry{}
err := unmarshalJSON(data, &g)
if err != nil {
return err
}
point, ok := g.Coordinates.(orb.Point)
if !ok {
return errors.New("geojson: not a Point type")
}
*p = Point(point)
return nil
}
// UnmarshalBSON will unmarshal GeoJSON Point geometry.
func (p *Point) UnmarshalBSON(data []byte) error {
g := &Geometry{}
err := bson.Unmarshal(data, &g)
if err != nil {
return err
}
point, ok := g.Coordinates.(orb.Point)
if !ok {
return errors.New("geojson: not a Point type")
}
*p = Point(point)
return nil
}
// A MultiPoint is a helper type that will marshal to/from a GeoJSON MultiPoint geometry.
type MultiPoint orb.MultiPoint
// Geometry will return the orb.Geometry version of the data.
func (mp MultiPoint) Geometry() orb.Geometry {
return orb.MultiPoint(mp)
}
// MarshalJSON will convert the MultiPoint into a GeoJSON MultiPoint geometry.
func (mp MultiPoint) MarshalJSON() ([]byte, error) {
return marshalJSON(&Geometry{Coordinates: orb.MultiPoint(mp)})
}
// MarshalBSON will convert the MultiPoint into a GeoJSON MultiPoint geometry BSON.
func (mp MultiPoint) MarshalBSON() ([]byte, error) {
return bson.Marshal(&Geometry{Coordinates: orb.MultiPoint(mp)})
}
// UnmarshalJSON will unmarshal the GeoJSON MultiPoint geometry.
func (mp *MultiPoint) UnmarshalJSON(data []byte) error {
g := &Geometry{}
err := unmarshalJSON(data, &g)
if err != nil {
return err
}
multiPoint, ok := g.Coordinates.(orb.MultiPoint)
if !ok {
return errors.New("geojson: not a MultiPoint type")
}
*mp = MultiPoint(multiPoint)
return nil
}
// UnmarshalBSON will unmarshal the GeoJSON MultiPoint geometry.
func (mp *MultiPoint) UnmarshalBSON(data []byte) error {
g := &Geometry{}
err := bson.Unmarshal(data, &g)
if err != nil {
return err
}
multiPoint, ok := g.Coordinates.(orb.MultiPoint)
if !ok {
return errors.New("geojson: not a MultiPoint type")
}
*mp = MultiPoint(multiPoint)
return nil
}
// A LineString is a helper type that will marshal to/from a GeoJSON LineString geometry.
type LineString orb.LineString
// Geometry will return the orb.Geometry version of the data.
func (ls LineString) Geometry() orb.Geometry {
return orb.LineString(ls)
}
// MarshalJSON will convert the LineString into a GeoJSON LineString geometry.
func (ls LineString) MarshalJSON() ([]byte, error) {
return marshalJSON(&Geometry{Coordinates: orb.LineString(ls)})
}
// MarshalBSON will convert the LineString into a GeoJSON LineString geometry.
func (ls LineString) MarshalBSON() ([]byte, error) {
return bson.Marshal(&Geometry{Coordinates: orb.LineString(ls)})
}
// UnmarshalJSON will unmarshal the GeoJSON MultiPoint geometry.
func (ls *LineString) UnmarshalJSON(data []byte) error {
g := &Geometry{}
err := unmarshalJSON(data, &g)
if err != nil {
return err
}
lineString, ok := g.Coordinates.(orb.LineString)
if !ok {
return errors.New("geojson: not a LineString type")
}
*ls = LineString(lineString)
return nil
}
// UnmarshalBSON will unmarshal the GeoJSON MultiPoint geometry.
func (ls *LineString) UnmarshalBSON(data []byte) error {
g := &Geometry{}
err := bson.Unmarshal(data, &g)
if err != nil {
return err
}
lineString, ok := g.Coordinates.(orb.LineString)
if !ok {
return errors.New("geojson: not a LineString type")
}
*ls = LineString(lineString)
return nil
}
// A MultiLineString is a helper type that will marshal to/from a GeoJSON MultiLineString geometry.
type MultiLineString orb.MultiLineString
// Geometry will return the orb.Geometry version of the data.
func (mls MultiLineString) Geometry() orb.Geometry {
return orb.MultiLineString(mls)
}
// MarshalJSON will convert the MultiLineString into a GeoJSON MultiLineString geometry.
func (mls MultiLineString) MarshalJSON() ([]byte, error) {
return marshalJSON(&Geometry{Coordinates: orb.MultiLineString(mls)})
}
// MarshalBSON will convert the MultiLineString into a GeoJSON MultiLineString geometry.
func (mls MultiLineString) MarshalBSON() ([]byte, error) {
return bson.Marshal(&Geometry{Coordinates: orb.MultiLineString(mls)})
}
// UnmarshalJSON will unmarshal the GeoJSON MultiPoint geometry.
func (mls *MultiLineString) UnmarshalJSON(data []byte) error {
g := &Geometry{}
err := unmarshalJSON(data, &g)
if err != nil {
return err
}
multilineString, ok := g.Coordinates.(orb.MultiLineString)
if !ok {
return errors.New("geojson: not a MultiLineString type")
}
*mls = MultiLineString(multilineString)
return nil
}
// UnmarshalBSON will unmarshal the GeoJSON MultiPoint geometry.
func (mls *MultiLineString) UnmarshalBSON(data []byte) error {
g := &Geometry{}
err := bson.Unmarshal(data, &g)
if err != nil {
return err
}
multilineString, ok := g.Coordinates.(orb.MultiLineString)
if !ok {
return errors.New("geojson: not a MultiLineString type")
}
*mls = MultiLineString(multilineString)
return nil
}
// A Polygon is a helper type that will marshal to/from a GeoJSON Polygon geometry.
type Polygon orb.Polygon
// Geometry will return the orb.Geometry version of the data.
func (p Polygon) Geometry() orb.Geometry {
return orb.Polygon(p)
}
// MarshalJSON will convert the Polygon into a GeoJSON Polygon geometry.
func (p Polygon) MarshalJSON() ([]byte, error) {
return marshalJSON(&Geometry{Coordinates: orb.Polygon(p)})
}
// MarshalBSON will convert the Polygon into a GeoJSON Polygon geometry.
func (p Polygon) MarshalBSON() ([]byte, error) {
return bson.Marshal(&Geometry{Coordinates: orb.Polygon(p)})
}
// UnmarshalJSON will unmarshal the GeoJSON Polygon geometry.
func (p *Polygon) UnmarshalJSON(data []byte) error {
g := &Geometry{}
err := unmarshalJSON(data, &g)
if err != nil {
return err
}
polygon, ok := g.Coordinates.(orb.Polygon)
if !ok {
return errors.New("geojson: not a Polygon type")
}
*p = Polygon(polygon)
return nil
}
// UnmarshalBSON will unmarshal the GeoJSON Polygon geometry.
func (p *Polygon) UnmarshalBSON(data []byte) error {
g := &Geometry{}
err := bson.Unmarshal(data, &g)
if err != nil {
return err
}
polygon, ok := g.Coordinates.(orb.Polygon)
if !ok {
return errors.New("geojson: not a Polygon type")
}
*p = Polygon(polygon)
return nil
}
// A MultiPolygon is a helper type that will marshal to/from a GeoJSON MultiPolygon geometry.
type MultiPolygon orb.MultiPolygon
// Geometry will return the orb.Geometry version of the data.
func (mp MultiPolygon) Geometry() orb.Geometry {
return orb.MultiPolygon(mp)
}
// MarshalJSON will convert the MultiPolygon into a GeoJSON MultiPolygon geometry.
func (mp MultiPolygon) MarshalJSON() ([]byte, error) {
return marshalJSON(&Geometry{Coordinates: orb.MultiPolygon(mp)})
}
// MarshalBSON will convert the MultiPolygon into a GeoJSON MultiPolygon geometry.
func (mp MultiPolygon) MarshalBSON() ([]byte, error) {
return bson.Marshal(&Geometry{Coordinates: orb.MultiPolygon(mp)})
}
// UnmarshalJSON will unmarshal the GeoJSON MultiPolygon geometry.
func (mp *MultiPolygon) UnmarshalJSON(data []byte) error {
g := &Geometry{}
err := unmarshalJSON(data, &g)
if err != nil {
return err
}
multiPolygon, ok := g.Coordinates.(orb.MultiPolygon)
if !ok {
return errors.New("geojson: not a MultiPolygon type")
}
*mp = MultiPolygon(multiPolygon)
return nil
}
// UnmarshalBSON will unmarshal the GeoJSON MultiPolygon geometry.
func (mp *MultiPolygon) UnmarshalBSON(data []byte) error {
g := &Geometry{}
err := bson.Unmarshal(data, &g)
if err != nil {
return err
}
multiPolygon, ok := g.Coordinates.(orb.MultiPolygon)
if !ok {
return errors.New("geojson: not a MultiPolygon type")
}
*mp = MultiPolygon(multiPolygon)
return nil
}
type bsonGeometry struct {
Type string `json:"type" bson:"type"`
Coordinates bson.RawValue `json:"coordinates" bson:"coordinates"`
Geometries []*Geometry `json:"geometries,omitempty" bson:"geometries"`
}
type jsonGeometry struct {
Type string `json:"type"`
Coordinates nocopyRawMessage `json:"coordinates"`
Geometries []*Geometry `json:"geometries,omitempty"`
}
type geometryMarshallDoc struct {
Type string `json:"type" bson:"type"`
Coordinates orb.Geometry `json:"coordinates,omitempty" bson:"coordinates,omitempty"`
Geometries []*Geometry `json:"geometries,omitempty" bson:"geometries,omitempty"`
}