+ # Return presets (default tags and crap) to potlatch.
+ # Uses POTLATCH_PRESETS global, set up in OSM::Potlatch
+ def getpresets #:doc:
+ return POTLATCH_PRESETS
+ end
+
+ # ----- whichways
+ # Find all the way ids and nodes (including tags and projected lat/lng) which aren't part of those ways in an are
+ #
+ # The argument is an array containing the following, in order:
+ # 0. minimum longitude
+ # 1. minimum latitude
+ # 2. maximum longitude
+ # 3. maximum latitude
+ # 4. baselong, 5. basey, 6. masterscale as above
+ def whichways(args) #:doc:
+ xmin = args[0].to_f-0.01
+ ymin = args[1].to_f-0.01
+ xmax = args[2].to_f+0.01
+ ymax = args[3].to_f+0.01
+ baselong = args[4]
+ basey = args[5]
+ masterscale = args[6]
+
+ RAILS_DEFAULT_LOGGER.info(" Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
+
+ # find the way ids in an area
+ nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => "current_nodes.visible = 1", :include => :ways)
+ way_ids = nodes_in_area.collect { |node| node.way_ids }.flatten.uniq
+
+ # find the node ids in an area that aren't part of ways
+ nodes_not_used_in_area = nodes_in_area.select { |node| node.ways.empty? }
+ points = nodes_not_used_in_area.collect { |n| [n.id, n.lon_potlatch(baselong,masterscale), n.lat_potlatch(basey,masterscale), n.tags_as_hash] }
+
+ # find the relations used by those nodes and ways
+ relation_ids = (Relation.find_for_nodes_and_ways(nodes_in_area.collect {|n| n.id}, way_ids)).collect {|n| n.id}.uniq
+
+ [way_ids,points,relation_ids]
+ end
+
+ # ----- whichways_deleted
+ # return array of deleted ways in current bounding box
+ # in: as whichways
+ # does: finds all deleted ways with a deleted node in bounding box
+ # out: [0] array of way ids
+ def whichways_deleted(args) #:doc:
+ xmin = args[0].to_f-0.01
+ ymin = args[1].to_f-0.01
+ xmax = args[2].to_f+0.01
+ ymax = args[3].to_f+0.01
+ baselong = args[4]
+ basey = args[5]
+ masterscale = args[6]
+
+ sql=<<-EOF
+ SELECT DISTINCT current_ways.id
+ FROM current_nodes,way_nodes,current_ways
+ WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")}
+ AND way_nodes.node_id=current_nodes.id
+ AND way_nodes.id=current_ways.id
+ AND current_nodes.visible=0
+ AND current_ways.visible=0
+ EOF
+ waylist = ActiveRecord::Base.connection.select_all(sql)
+ ways = waylist.collect {|a| a['id'].to_i }
+ [ways]
+ end
+
+ # ----- getway
+ # Get a way with all of it's nodes and tags
+ # The input is an array with the following components, in order:
+ # 0. wayid - the ID of the way to get
+ # 1. baselong - origin of SWF map (longitude)
+ # 2. basey - origin of SWF map (latitude)
+ # 3. masterscale - SWF map scale
+ #
+ # The output is an array which contains all the nodes (with projected
+ # latitude and longitude) and tags for a way (and all the nodes tags).
+ # It also has the way's unprojected (WGS84) bbox.
+ #
+ # FIXME: The server really shouldn't be figuring out a ways bounding box and doing projection for potlatch
+ # FIXME: the argument splitting should be done in the 'talk' method, not here
+ def getway(args) #:doc:
+ wayid,baselong,basey,masterscale = args
+ wayid = wayid.to_i
+
+ RAILS_DEFAULT_LOGGER.info(" Message: getway, id=#{wayid}")
+
+ # Ideally we would do ":include => :nodes" here but if we do that
+ # then rails only seems to return the first copy of a node when a
+ # way includes a node more than once
+ way = Way.find(wayid)
+
+ long_array = []
+ lat_array = []
+ points = []
+
+ way.nodes.each do |node|
+ projected_longitude = node.lon_potlatch(baselong,masterscale) # do projection for potlatch
+ projected_latitude = node.lat_potlatch(basey,masterscale)
+ id = node.id
+ tags_hash = node.tags_as_hash
+
+ points << [projected_longitude, projected_latitude, id, nil, tags_hash]
+ long_array << projected_longitude
+ lat_array << projected_latitude
+ end
+
+ [wayid,points,way.tags,long_array.min,long_array.max,lat_array.min,lat_array.max]
+ end
+
+ # ----- getway_old
+ # returns old version of way
+ # in: [0] way id,
+ # [1] way version to get (or -1 for "last deleted version")
+ # [2] baselong, [3] basey, [4] masterscale
+ # does: gets old version of way and all constituent nodes
+ # for undelete, always uses the most recent version of each node
+ # (even if it's moved)
+ # for revert, uses the historic version of each node, but if that node is
+ # still visible and has been changed since, generates a new node id
+ # out: [0] 0 (code for success), [1] SWF object name,
+ # [2] array of points (as getway _except_ [3] is node.visible?, 0 or 1),
+ # [4] xmin, [5] xmax, [6] ymin, [7] ymax (unprojected bbox),
+ # [8] way version
+ def getway_old(args) #:doc:
+ RAILS_DEFAULT_LOGGER.info(" Message: getway_old (server is #{SERVER_URL})")
+ # if SERVER_URL=="www.openstreetmap.org" then return -1,"Revert is not currently enabled on the OpenStreetMap server." end
+
+ wayid,version,baselong,basey,masterscale=args
+ wayid = wayid.to_i
+ version = version.to_i
+ xmin = ymin = 999999
+ xmax = ymax = -999999
+ points=[]
+ if version<0
+ historic=false
+ version=getlastversion(wayid,version)
+ else
+ historic=true
+ end
+ readwayquery_old(wayid,version,historic).each { |row|
+ points<<[long2coord(row['longitude'].to_f,baselong,masterscale),lat2coord(row['latitude'].to_f,basey,masterscale),row['id'].to_i,row['visible'].to_i,tag2array(row['tags'].to_s)]
+ xmin=[xmin,row['longitude'].to_f].min
+ xmax=[xmax,row['longitude'].to_f].max
+ ymin=[ymin,row['latitude' ].to_f].min
+ ymax=[ymax,row['latitude' ].to_f].max
+ }
+
+ # get tags from this version
+ attributes={}
+ attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM way_tags WHERE id=#{wayid} AND version=#{version}"
+ attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] }
+ attributes['history']="Retrieved from v"+version.to_s
+
+ [0,wayid,points,attributes,xmin,xmax,ymin,ymax,version]
+ end
+
+ # ----- getway_history
+ # find history of a way
+ # in: [0] way id
+ # does: finds history of a way
+ # out: [0] array of previous versions (where each is
+ # [0] version, [1] db timestamp (string),
+ # [2] visible 0 or 1,
+ # [3] username or 'anonymous' (string))
+ def getway_history(args) #:doc:
+ wayid=args[0]
+ history=[]
+ sql=<<-EOF
+ SELECT version,timestamp,visible,display_name,data_public
+ FROM ways,users
+ WHERE ways.id=#{wayid}
+ AND ways.user_id=users.id
+ AND ways.visible=1
+ ORDER BY version DESC
+ EOF
+ histlist=ActiveRecord::Base.connection.select_all(sql)
+ histlist.each { |row|
+ if row['data_public'].to_i==1 then user=row['display_name'] else user='anonymous' end
+ history<<[row['version'],row['timestamp'],row['visible'],user]
+ }
+ [history]
+ end
+
+ # ----- getrelation
+ # Get a relation with all of it's tags, and member IDs
+ # The input is an array with the following components, in order:
+ # 0. relid - the ID of the relation to get
+ #
+ # The output is an array which contains:
+ # [0] relation id, [1] hash of tags, [2] list of members
+ def getrelation(args) #:doc:
+ relid = args[0]
+ relid = relid.to_i
+
+ RAILS_DEFAULT_LOGGER.info(" Message: getrel, id=#{relid}")
+
+ rel = Relation.find(relid)
+
+ [relid,rel.tags,rel.members]#nodes,ways]
+ end
+
+ # ----- getrelation
+ # save relation to the database
+ # in: [0] user token (string),
+ # [1] original relation id (may be negative),
+ # [2] hash of tags, [3] list of members,
+ # [4] visible
+ # out: [0] 0 (success), [1] original relation id (unchanged),
+ # [2] new relation id
+ def putrelation(args, renumberednodes, renumberedways) #:doc:
+ usertoken,relid,tags,members,visible=args
+ uid=getuserid(usertoken)
+ if !uid then return -1,"You are not logged in, so the point could not be saved." end
+
+ relid = relid.to_i
+ visible = visible.to_i
+
+ # create a new relation, or find the existing one
+ if relid <= 0
+ rel = Relation.new
+ else
+ rel = Relation.find(relid)
+ end
+
+ # check the members are all positive, and correctly type
+ typedmembers = []
+ members.each do |m|
+ mid = m[1].to_i
+ if mid < 0
+ mid = renumberednodes[mid] if m[0] == 'node'
+ mid = renumberedways[mid] if m[0] == 'way'
+ if mid < 0
+ return -2, "Negative ID unresolved"
+ end
+ end
+ typedmembers << [m[0], mid, m[2]]
+ end
+
+ # assign new contents
+ rel.members = typedmembers
+ rel.tags = tags
+ rel.visible = visible
+ rel.user_id = uid
+
+ # check it then save it
+ # BUG: the following is commented out because it always fails on my
+ # install. I think it's a Rails bug.
+
+ #if !rel.preconditions_ok?
+ # return -2, "Relation preconditions failed"
+ #else
+ rel.save_with_history!
+ #end
+
+ [0,relid,rel.id]
+ end
+
+ # ----- putway
+ # saves a way to the database
+ # in: [0] user token (string),
+ # [1] original way id (may be negative),
+ # [2] array of points (as getway/getway_old),
+ # [3] hash of way tags,
+ # [4] original way version (0 if not a reverted/undeleted way),
+ # [5] baselong, [6] basey, [7] masterscale
+ # does: saves way to the database
+ # all constituent nodes are created/updated as necessary
+ # (or deleted if they were in the old version and are otherwise unused)
+ # out: [0] 0 (code for success), [1] original way id (unchanged),
+ # [2] new way id, [3] hash of renumbered nodes (old id=>new id),
+ # [4] xmin, [5] xmax, [6] ymin, [7] ymax (unprojected bbox)
+ def putway(args,renumberednodes) #:doc:
+ RAILS_DEFAULT_LOGGER.info(" putway started")
+ usertoken,originalway,points,attributes,oldversion,baselong,basey,masterscale=args
+ uid=getuserid(usertoken)
+ if !uid then return -1,"You are not logged in, so the way could not be saved." end
+
+ RAILS_DEFAULT_LOGGER.info(" putway authenticated happily")
+ db_uqn='unin'+(rand*100).to_i.to_s+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # temp uniquenodes table name, typically 51 chars
+ db_now='@now'+(rand*100).to_i.to_s+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
+ ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
+ originalway=originalway.to_i
+ oldversion=oldversion.to_i
+
+ RAILS_DEFAULT_LOGGER.info(" Message: putway, id=#{originalway}")
+
+ # -- Check for null IDs, short ways or lats=90
+
+ points.each do |a|
+ if a[2]==0 or a[2].nil? then return -2,"Server error - node with id 0 found in way #{originalway}." end
+ if coord2lat(a[1],masterscale,basey)==90 then return -2,"Server error - node with lat -90 found in way #{originalway}." end
+ end
+
+ if points.length<2 then return -2,"Server error - way is only #{points.length} points long." end
+
+ # -- 3. read original way into memory
+
+ xc={}; yc={}; tagc={}; vc={}
+ if originalway>0
+ way=originalway
+ if oldversion==0 then r=readwayquery(way,false)
+ else r=readwayquery_old(way,oldversion,true) end
+ r.each { |row|
+ id=row['id'].to_i
+ if (id>0) then
+ xc[id]=row['longitude'].to_f
+ yc[id]=row['latitude' ].to_f
+ tagc[id]=row['tags']
+ vc[id]=row['visible'].to_i
+ end
+ }
+ ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
+ else
+ way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)")
+ end
+
+ # -- 4. get version by inserting new row into ways
+
+ version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)")
+
+ # -- 5. compare nodes and update xmin,xmax,ymin,ymax
+
+ xmin=ymin= 999999
+ xmax=ymax=-999999
+ insertsql=''
+ nodelist=[]
+
+ points.each_index do |i|
+ xs=coord2long(points[i][0],masterscale,baselong)
+ ys=coord2lat(points[i][1],masterscale,basey)
+ xmin=[xs,xmin].min; xmax=[xs,xmax].max
+ ymin=[ys,ymin].min; ymax=[ys,ymax].max
+ node=points[i][2].to_i
+ tagstr=array2tag(points[i][4])
+ tagsql="'"+sqlescape(tagstr)+"'"
+ lat=(ys * 10000000).round
+ long=(xs * 10000000).round
+ tile=QuadTile.tile_for_point(ys, xs)
+
+ # compare node
+ if node<0
+ # new node - create
+ if renumberednodes[node.to_s].nil?
+ newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes ( latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES ( #{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
+ ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newnode},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
+ points[i][2]=newnode
+ nodelist.push(newnode)
+ renumberednodes[node.to_s]=newnode.to_s
+ else
+ points[i][2]=renumberednodes[node.to_s].to_i
+ end
+
+ elsif xc.has_key?(node)
+ nodelist.push(node)
+ # old node from original way - update
+ if ((xs/0.0000001).round!=(xc[node]/0.0000001).round or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node] or vc[node]==0)
+ ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{node},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
+ ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},tags=#{tagsql},visible=1,tile=#{tile} WHERE id=#{node}")
+ end
+ else
+ # old node, created in another way and now added to this way
+ end
+ end
+
+ # -- 6a. delete any nodes not in modified way
+
+ createuniquenodes(way,db_uqn,nodelist) # nodes which appear in this way but no other
+
+ sql=<<-EOF
+ INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
+ SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
+ FROM current_nodes AS cn,#{db_uqn}
+ WHERE cn.id=node_id
+ EOF
+ ActiveRecord::Base.connection.insert(sql)
+
+ sql=<<-EOF
+ UPDATE current_nodes AS cn, #{db_uqn}
+ SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
+ WHERE cn.id=node_id
+ EOF
+ ActiveRecord::Base.connection.update(sql)
+
+ deleteuniquenoderelations(db_uqn,uid,db_now)
+ ActiveRecord::Base.connection.execute("DROP TEMPORARY TABLE #{db_uqn}")
+
+ # 6b. insert new version of route into way_nodes
+
+ insertsql =''
+ currentsql=''
+ sequence =1
+ points.each do |p|
+ if insertsql !='' then insertsql +=',' end
+ if currentsql!='' then currentsql+=',' end
+ insertsql +="(#{way},#{p[2]},#{sequence},#{version})"
+ currentsql+="(#{way},#{p[2]},#{sequence})"
+ sequence +=1
+ end
+
+ ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}");
+ ActiveRecord::Base.connection.insert( "INSERT INTO way_nodes (id,node_id,sequence_id,version) VALUES #{insertsql}");
+ ActiveRecord::Base.connection.insert( "INSERT INTO current_way_nodes (id,node_id,sequence_id ) VALUES #{currentsql}");
+
+ # -- 7. insert new way tags
+
+ insertsql =''
+ currentsql=''
+ attributes.each do |k,v|
+ if v=='' or v.nil? then next end
+ if v[0,6]=='(type ' then next end
+ if insertsql !='' then insertsql +=',' end
+ if currentsql!='' then currentsql+=',' end
+ insertsql +="(#{way},'"+sqlescape(k.gsub('|',':'))+"','"+sqlescape(v)+"',#{version})"
+ currentsql+="(#{way},'"+sqlescape(k.gsub('|',':'))+"','"+sqlescape(v)+"')"
+ end
+
+ ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
+ if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
+ if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
+
+ [0,originalway,way,renumberednodes,xmin,xmax,ymin,ymax]
+ end
+
+ # ----- putpoi
+ # save POI to the database
+ # in: [0] user token (string),
+ # [1] original node id (may be negative),
+ # [2] projected longitude, [3] projected latitude,
+ # [4] hash of tags, [5] visible (0 to delete, 1 otherwise),
+ # [6] baselong, [7] basey, [8] masterscale
+ # does: saves POI node to the database
+ # refuses save if the node has since become part of a way
+ # out: [0] 0 (success), [1] original node id (unchanged),
+ # [2] new node id
+ def putpoi(args) #:doc:
+ usertoken,id,x,y,tags,visible,baselong,basey,masterscale=args
+ uid=getuserid(usertoken)
+ if !uid then return -1,"You are not logged in, so the point could not be saved." end
+
+ db_now='@now'+(rand*100).to_i.to_s+uid.to_s+id.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
+ ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
+
+ id=id.to_i
+ visible=visible.to_i
+ if visible==0 then
+ # if deleting, check node hasn't become part of a way
+ inway=ActiveRecord::Base.connection.select_one("SELECT cw.id FROM current_ways cw,current_way_nodes cwn WHERE cw.id=cwn.id AND cw.visible=1 AND cwn.node_id=#{id} LIMIT 1")
+ unless inway.nil? then return -1,"The point has since become part of a way, so you cannot save it as a POI." end
+ deleteitemrelations(id,'node',uid,db_now)
+ end
+
+ x=coord2long(x.to_f,masterscale,baselong)
+ y=coord2lat(y.to_f,masterscale,basey)
+ tagsql="'"+sqlescape(array2tag(tags))+"'"
+ lat=(y * 10000000).round
+ long=(x * 10000000).round
+ tile=QuadTile.tile_for_point(y, x)
+
+ if (id>0) then
+ ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{id},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
+ ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},visible=#{visible},tags=#{tagsql},tile=#{tile} WHERE id=#{id}");
+ newid=id
+ else
+ newid=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
+ ActiveRecord::Base.connection.update("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newid},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
+ end
+ [0,id,newid]
+ end
+
+ # ----- getpoi
+ # read POI from database
+ # (only called on revert: POIs are usually read by whichways)
+ # in: [0] node id, [1] baselong, [2] basey, [3] masterscale
+ # does: reads POI
+ # out: [0] id (unchanged), [1] projected long, [2] projected lat,
+ # [3] hash of tags
+ def getpoi(args) #:doc:
+ id,baselong,basey,masterscale = args
+
+ n = Node.find(id.to_i)
+ if n
+ return [n.id, n.lon_potlatch(baselong,masterscale), n.lat_potlatch(basey,masterscale), n.tags_as_hash]
+ else
+ return [nil,nil,nil,'']
+ end
+ end
+
+ # ----- deleteway
+ # delete way and constituent nodes from database
+ # in: [0] user token (string), [1] way id
+ # does: deletes way from db and any constituent nodes not used elsewhere
+ # also removes ways/nodes from any relations they're in
+ # out: [0] 0 (success), [1] way id (unchanged)
+
+ def deleteway(args) #:doc:
+ usertoken,way_id=args
+ RAILS_DEFAULT_LOGGER.info(" Message: deleteway, id=#{way_id}")
+ uid=getuserid(usertoken)
+ if !uid then return -1,"You are not logged in, so the way could not be deleted." end
+
+ # FIXME
+ # the next bit removes the way from any relations
+ # the delete_with_relations_and_nodes_and_history method should do this,
+ # but at present it just throws a 'precondition failed'
+ way=way.to_i
+ db_now='@now'+(rand*100).to_i.to_s+uid.to_s+way.abs.to_s+Time.new.to_i.to_s
+ db_uqn='unin'+(rand*100).to_i.to_s+uid.to_s+way.abs.to_s+Time.new.to_i.to_s
+ ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
+ createuniquenodes(way,db_uqn,[])
+ deleteuniquenoderelations(db_uqn,uid,db_now)
+ deleteitemrelations(way_id,'way',uid,db_now)
+ ActiveRecord::Base.connection.execute("DROP TEMPORARY TABLE #{db_uqn}")
+ # end of FIXME
+
+ # now delete the way
+ user = User.find(uid)
+ way = Way.find(way_id)
+ way.delete_with_relations_and_nodes_and_history(user)
+ return [0,way_id]
+ end
+
+
+ def readwayquery(id,insistonvisible) #:doc:
+ sql=<<-EOF
+ SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,current_nodes.id,tags,visible
+ FROM current_way_nodes,current_nodes
+ WHERE current_way_nodes.id=#{id}
+ AND current_way_nodes.node_id=current_nodes.id
+ EOF
+ if insistonvisible then sql+=" AND current_nodes.visible=1 " end
+ sql+=" ORDER BY sequence_id"
+ ActiveRecord::Base.connection.select_all(sql)
+ end
+
+ # Get the latest version id of a way
+ def getlastversion(id,version) #:doc:
+ old_way = OldWay.find(:first, :conditions => ['visible=1 AND id=?' , id], :order => 'version DESC')
+ old_way.version
+ end
+
+ def readwayquery_old(id,version,historic) #:doc:
+ # Node handling on undelete (historic=false):
+ # - always use the node specified, even if it's moved
+
+ # Node handling on revert (historic=true):
+ # - if it's a visible node, use a new node id (i.e. not mucking up the old one)
+ # which means the SWF needs to allocate new ids
+ # - if it's an invisible node, we can reuse the old node id
+
+ # ----- get node list from specified version of way,
+ # and the _current_ lat/long/tags of each node
+
+ row=ActiveRecord::Base.connection.select_one("SELECT timestamp FROM ways WHERE version=#{version} AND id=#{id}")
+ waytime=row['timestamp']
+
+ sql=<<-EOF
+ SELECT cn.id,visible,latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags
+ FROM way_nodes wn,current_nodes cn
+ WHERE wn.version=#{version}
+ AND wn.id=#{id}
+ AND wn.node_id=cn.id
+ ORDER BY sequence_id
+ EOF
+ rows=ActiveRecord::Base.connection.select_all(sql)
+
+ # ----- if historic (full revert), get the old version of each node
+ # - if it's in another way now, generate a new id
+ # - if it's not in another way, use the old ID
+
+ if historic then
+ rows.each_index do |i|
+ sql=<<-EOF
+ SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags,cwn.id AS currentway
+ FROM nodes n
+ LEFT JOIN current_way_nodes cwn
+ ON cwn.node_id=n.id AND cwn.id!=#{id}
+ WHERE n.id=#{rows[i]['id']}
+ AND n.timestamp<="#{waytime}"
+ ORDER BY n.timestamp DESC
+ LIMIT 1
+ EOF
+ row=ActiveRecord::Base.connection.select_one(sql)
+ nx=row['longitude'].to_f
+ ny=row['latitude'].to_f
+ if (!row.nil?)
+ if (row['currentway'] && (nx!=rows[i]['longitude'].to_f or ny!=rows[i]['latitude'].to_f or row['tags']!=rows[i]['tags'])) then rows[i]['id']=-1 end
projects / rails.git / blobdiff