187 lines
4.6 KiB
Go
187 lines
4.6 KiB
Go
package pbf
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import (
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"github.com/omniscale/imposm3/element"
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"github.com/omniscale/imposm3/parser/pbf/internal/osmpbf"
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)
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const coord_factor float64 = 11930464.7083 // ((2<<31)-1)/360.0
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func readDenseNodes(
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dense *osmpbf.DenseNodes,
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block *osmpbf.PrimitiveBlock,
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stringtable stringTable) (coords []element.Node, nodes []element.Node) {
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var lastId int64
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var lastLon, lastLat int64
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coords = make([]element.Node, len(dense.Id))
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nodes = make([]element.Node, 0, len(dense.Id)/8)
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granularity := int64(block.GetGranularity())
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latOffset := block.GetLatOffset()
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lonOffset := block.GetLonOffset()
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coordScale := 0.000000001
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lastKeyValPos := 0
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for i := range coords {
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lastId += dense.Id[i]
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lastLon += dense.Lon[i]
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lastLat += dense.Lat[i]
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coords[i].Id = lastId
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coords[i].Long = (coordScale * float64(lonOffset+(granularity*lastLon)))
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coords[i].Lat = (coordScale * float64(latOffset+(granularity*lastLat)))
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if stringtable != nil && len(dense.KeysVals) > 0 {
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if dense.KeysVals[lastKeyValPos] != 0 {
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tags := parseDenseNodeTags(stringtable, &dense.KeysVals, &lastKeyValPos)
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if tags != nil {
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if _, ok := tags["created_by"]; ok && len(tags) == 1 {
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// don't add nodes with only created_by tag to nodes cache
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} else {
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nd := coords[i]
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nd.Tags = tags
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nodes = append(nodes, nd)
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}
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}
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} else {
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lastKeyValPos += 1
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}
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}
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}
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return coords, nodes
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}
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func parseDenseNodeTags(stringtable stringTable, keysVals *[]int32, pos *int) map[string]string {
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// make map later if needed
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var result map[string]string
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for {
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if *pos >= len(*keysVals) {
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return result
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}
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key := (*keysVals)[*pos]
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*pos += 1
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if key == 0 {
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return result
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}
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val := (*keysVals)[*pos]
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*pos += 1
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if result == nil {
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result = make(map[string]string)
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}
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result[stringtable[key]] = stringtable[val]
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}
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}
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func parseTags(stringtable stringTable, keys []uint32, vals []uint32) map[string]string {
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if len(keys) == 0 {
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return nil
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}
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tags := make(map[string]string)
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for i := 0; i < len(keys); i++ {
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key := stringtable[keys[i]]
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val := stringtable[vals[i]]
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tags[key] = val
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}
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return tags
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}
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func readNodes(
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nodes []osmpbf.Node,
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block *osmpbf.PrimitiveBlock,
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stringtable stringTable) ([]element.Node, []element.Node) {
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coords := make([]element.Node, len(nodes))
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nds := make([]element.Node, 0, len(nodes)/8)
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granularity := int64(block.GetGranularity())
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latOffset := block.GetLatOffset()
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lonOffset := block.GetLonOffset()
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coordScale := 0.000000001
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for i := range nodes {
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id := nodes[i].Id
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lon := nodes[i].Lon
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lat := nodes[i].Lat
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coords[i].Id = id
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coords[i].Long = (coordScale * float64(lonOffset+(granularity*lon)))
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coords[i].Lat = (coordScale * float64(latOffset+(granularity*lat)))
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if stringtable != nil {
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tags := parseTags(stringtable, nodes[i].Keys, nodes[i].Vals)
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if tags != nil {
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if _, ok := tags["created_by"]; ok && len(tags) == 1 {
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// don't add nodes with only created_by tag to nodes cache
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} else {
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nd := coords[i]
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nd.Tags = tags
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nds = append(nds, nd)
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}
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}
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}
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}
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return coords, nds
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}
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func parseDeltaRefs(refs []int64) []int64 {
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result := make([]int64, len(refs))
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var lastRef int64
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for i, refDelta := range refs {
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lastRef += refDelta
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result[i] = lastRef
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}
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return result
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}
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func readWays(
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ways []osmpbf.Way,
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block *osmpbf.PrimitiveBlock,
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stringtable stringTable) []element.Way {
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result := make([]element.Way, len(ways))
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for i := range ways {
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id := ways[i].Id
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result[i].Id = id
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result[i].Tags = parseTags(stringtable, ways[i].Keys, ways[i].Vals)
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result[i].Refs = parseDeltaRefs(ways[i].Refs)
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}
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return result
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}
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func parseRelationMembers(rel osmpbf.Relation, stringtable stringTable) []element.Member {
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result := make([]element.Member, len(rel.Memids))
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var lastId int64
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for i := range rel.Memids {
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lastId += rel.Memids[i]
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result[i].Id = lastId
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result[i].Role = stringtable[rel.RolesSid[i]]
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result[i].Type = element.MemberType(rel.Types[i])
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}
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return result
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}
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func readRelations(
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relations []osmpbf.Relation,
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block *osmpbf.PrimitiveBlock,
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stringtable stringTable) []element.Relation {
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result := make([]element.Relation, len(relations))
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for i := range relations {
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id := relations[i].Id
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result[i].Id = id
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result[i].Tags = parseTags(stringtable, relations[i].Keys, relations[i].Vals)
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result[i].Members = parseRelationMembers(relations[i], stringtable)
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}
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return result
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}
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type stringTable []string
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func newStringTable(source *osmpbf.StringTable) stringTable {
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result := make(stringTable, len(source.S))
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for i, bytes := range source.S {
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result[i] = string(bytes)
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}
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return result
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}
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