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/*
Package geojson is a library for encoding and decoding GeoJSON into Go structs
using the geometries in the orb package. Supports both the json.Marshaler and
json.Unmarshaler interfaces as well as helper functions such as
`UnmarshalFeatureCollection` and `UnmarshalFeature`.
*/
package geojson
import (
"fmt"
"go.mongodb.org/mongo-driver/bson"
)
const featureCollection = "FeatureCollection"
// A FeatureCollection correlates to a GeoJSON feature collection.
type FeatureCollection struct {
Type string `json:"type"`
BBox BBox `json:"bbox,omitempty"`
Features []*Feature `json:"features"`
// ExtraMembers can be used to encoded/decode extra key/members in
// the base of the feature collection. Note that keys of "type", "bbox"
// and "features" will not work as those are reserved by the GeoJSON spec.
ExtraMembers Properties `json:"-"`
}
// NewFeatureCollection creates and initializes a new feature collection.
func NewFeatureCollection() *FeatureCollection {
return &FeatureCollection{
Type: featureCollection,
Features: []*Feature{},
}
}
// Append appends a feature to the collection.
func (fc *FeatureCollection) Append(feature *Feature) *FeatureCollection {
fc.Features = append(fc.Features, feature)
return fc
}
// MarshalJSON converts the feature collection object into the proper JSON.
// It will handle the encoding of all the child features and geometries.
// Alternately one can call json.Marshal(fc) directly for the same result.
// Items in the ExtraMembers map will be included in the base of the
// feature collection object.
func (fc FeatureCollection) MarshalJSON() ([]byte, error) {
m := newFeatureCollectionDoc(fc)
return marshalJSON(m)
}
// MarshalBSON converts the feature collection object into a BSON document
// represented by bytes. It will handle the encoding of all the child features
// and geometries.
// Items in the ExtraMembers map will be included in the base of the
// feature collection object.
func (fc FeatureCollection) MarshalBSON() ([]byte, error) {
m := newFeatureCollectionDoc(fc)
return bson.Marshal(m)
}
func newFeatureCollectionDoc(fc FeatureCollection) map[string]interface{} {
var tmp map[string]interface{}
if fc.ExtraMembers != nil {
tmp = fc.ExtraMembers.Clone()
} else {
tmp = make(map[string]interface{}, 3)
}
tmp["type"] = featureCollection
delete(tmp, "bbox")
if fc.BBox != nil {
tmp["bbox"] = fc.BBox
}
if fc.Features == nil {
tmp["features"] = []*Feature{}
} else {
tmp["features"] = fc.Features
}
return tmp
}
// UnmarshalJSON decodes the data into a GeoJSON feature collection.
// Extra/foreign members will be put into the `ExtraMembers` attribute.
func (fc *FeatureCollection) UnmarshalJSON(data []byte) error {
tmp := make(map[string]nocopyRawMessage, 4)
err := unmarshalJSON(data, &tmp)
if err != nil {
return err
}
*fc = FeatureCollection{}
for key, value := range tmp {
switch key {
case "type":
err := unmarshalJSON(value, &fc.Type)
if err != nil {
return err
}
case "bbox":
err := unmarshalJSON(value, &fc.BBox)
if err != nil {
return err
}
case "features":
err := unmarshalJSON(value, &fc.Features)
if err != nil {
return err
}
default:
if fc.ExtraMembers == nil {
fc.ExtraMembers = Properties{}
}
var val interface{}
err := unmarshalJSON(value, &val)
if err != nil {
return err
}
fc.ExtraMembers[key] = val
}
}
if fc.Type != featureCollection {
return fmt.Errorf("geojson: not a feature collection: type=%s", fc.Type)
}
return nil
}
// UnmarshalBSON will unmarshal a BSON document created with bson.Marshal.
// Extra/foreign members will be put into the `ExtraMembers` attribute.
func (fc *FeatureCollection) UnmarshalBSON(data []byte) error {
tmp := make(map[string]bson.RawValue, 4)
err := bson.Unmarshal(data, &tmp)
if err != nil {
return err
}
*fc = FeatureCollection{}
for key, value := range tmp {
switch key {
case "type":
fc.Type, _ = bson.RawValue(value).StringValueOK()
case "bbox":
err := value.Unmarshal(&fc.BBox)
if err != nil {
return err
}
case "features":
err := value.Unmarshal(&fc.Features)
if err != nil {
return err
}
default:
if fc.ExtraMembers == nil {
fc.ExtraMembers = Properties{}
}
var val interface{}
err := value.Unmarshal(&val)
if err != nil {
return err
}
fc.ExtraMembers[key] = val
}
}
if fc.Type != featureCollection {
return fmt.Errorf("geojson: not a feature collection: type=%s", fc.Type)
}
return nil
}
// UnmarshalFeatureCollection decodes the data into a GeoJSON feature collection.
// Alternately one can call json.Unmarshal(fc) directly for the same result.
func UnmarshalFeatureCollection(data []byte) (*FeatureCollection, error) {
fc := &FeatureCollection{}
err := fc.UnmarshalJSON(data)
if err != nil {
return nil, err
}
return fc, nil
}
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