/
relations.go
99 lines (85 loc) · 2.09 KB
/
relations.go
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// Copyright 2021 Grabtaxi Holdings Pte Ltd (GRAB), All rights reserved.
// Use of this source code is governed by an MIT-style license that can be found in the LICENSE file
package gosm
import "github.com/grab/gosm/gosmpb"
// Relation is the struct for OSM relation.
type Relation struct {
ID int64
Tags map[string]string
Members []Member
Info gosmpb.Info
}
// MemberType enum
type MemberType int
const (
// NodeType ...
NodeType MemberType = iota
// WayType ...
WayType
// RelationType ...
RelationType
)
// Member is used to describe the entity in one relation.
type Member struct {
ID int64
Type MemberType
Role string
}
// AppendRelations writes the relation data to the buffer.
func (e *Encoder) AppendRelations(relations []*Relation) {
e.relationsBuf <- &relationMembers{
rs: relations,
}
}
// relationMembers implements members.
type relationMembers struct {
rs []*Relation
}
func (r *relationMembers) toPrimitiveBlock() (*gosmpb.PrimitiveBlock, error) {
st := newStringTable()
var relations []*gosmpb.Relation
for _, m := range r.rs {
keys, values := st.addTags(m.Tags)
memberIDs := make([]int64, len(m.Members))
memberTypes := make([]gosmpb.Relation_MemberType, len(m.Members))
roles := make([]string, len(m.Members))
for i, mem := range m.Members {
memberIDs[i] = mem.ID
memberTypes[i] = gosmpb.Relation_MemberType(mem.Type)
roles[i] = mem.Role
}
roleIDs := st.addRoles(roles)
relationPb := &gosmpb.Relation{
Id: int64ToPointer(m.ID),
Keys: keys,
Vals: values,
RolesSid: roleIDs,
Memids: deltaEncodeInt64s(memberIDs),
Types: memberTypes,
}
relations = append(relations, relationPb)
}
pb := &gosmpb.PrimitiveBlock{
Stringtable: &gosmpb.StringTable{
S: st.table,
},
Primitivegroup: []*gosmpb.PrimitiveGroup{
{
Relations: relations,
},
},
}
return pb, nil
}
func (r *relationMembers) len() int {
return len(r.rs)
}
func (r *relationMembers) clear() {
r.rs = nil
}
func (r *relationMembers) appendMembers(m members) {
r1, ok := m.(*relationMembers)
if ok {
r.rs = append(r.rs, r1.rs...)
}
}