class Way < ActiveRecord::Base
require 'xml/libxml'
+
+ include ConsistencyValidations
set_table_name 'current_ways'
-
- belongs_to :user
+
+ belongs_to :changeset
has_many :old_ways, :foreign_key => 'id', :order => 'version'
has_many :containing_relation_members, :class_name => "RelationMember", :as => :member
has_many :containing_relations, :class_name => "Relation", :through => :containing_relation_members, :source => :relation, :extend => ObjectFinder
+ validates_presence_of :id, :on => :update
+ validates_presence_of :changeset_id,:version, :timestamp
+ validates_uniqueness_of :id
+ validates_inclusion_of :visible, :in => [ true, false ]
+ validates_numericality_of :changeset_id, :version, :integer_only => true
+ validates_numericality_of :id, :on => :update, :integer_only => true
+ validates_associated :changeset
+
+ # Read in xml as text and return it's Way object representation
def self.from_xml(xml, create=false)
begin
- p = XML::Parser.new
- p.string = xml
+ p = XML::Parser.string(xml)
doc = p.parse
- way = Way.new
-
doc.find('//osm/way').each do |pt|
- if !create and pt['id'] != '0'
- way.id = pt['id'].to_i
- end
+ return Way.from_xml_node(pt, create)
+ end
+ raise OSM::APIBadXMLError.new("node", xml, "XML doesn't contain an osm/way element.")
+ rescue LibXML::XML::Error, ArgumentError => ex
+ raise OSM::APIBadXMLError.new("way", xml, ex.message)
+ end
+ end
- if create
- way.timestamp = Time.now
- way.visible = true
- else
- if pt['timestamp']
- way.timestamp = Time.parse(pt['timestamp'])
- end
- end
+ def self.from_xml_node(pt, create=false)
+ way = Way.new
- pt.find('tag').each do |tag|
- way.add_tag_keyval(tag['k'], tag['v'])
- end
+ raise OSM::APIBadXMLError.new("way", pt, "Version is required when updating") unless create or not pt['version'].nil?
+ way.version = pt['version']
+ raise OSM::APIBadXMLError.new("way", pt, "Changeset id is missing") if pt['changeset'].nil?
+ way.changeset_id = pt['changeset']
- pt.find('nd').each do |nd|
- way.add_nd_num(nd['ref'])
- end
- end
- rescue
- way = nil
+ unless create
+ raise OSM::APIBadXMLError.new("way", pt, "ID is required when updating") if pt['id'].nil?
+ way.id = pt['id'].to_i
+ # .to_i will return 0 if there is no number that can be parsed.
+ # We want to make sure that there is no id with zero anyway
+ raise OSM::APIBadUserInput.new("ID of way cannot be zero when updating.") if way.id == 0
+ end
+
+ # We don't care about the timestamp nor the visibility as these are either
+ # set explicitly or implicit in the action. The visibility is set to true,
+ # and manually set to false before the actual delete.
+ way.visible = true
+
+ pt.find('tag').each do |tag|
+ raise OSM::APIBadXMLError.new("way", pt, "tag is missing key") if tag['k'].nil?
+ raise OSM::APIBadXMLError.new("way", pt, "tag is missing value") if tag['v'].nil?
+ way.add_tag_keyval(tag['k'], tag['v'])
+ end
+
+ pt.find('nd').each do |nd|
+ way.add_nd_num(nd['ref'])
end
return way
return doc
end
- def to_xml_node(visible_nodes = nil, user_display_name_cache = nil)
+ def to_xml_node(visible_nodes = nil, changeset_cache = {}, user_display_name_cache = {})
el1 = XML::Node.new 'way'
el1['id'] = self.id.to_s
el1['visible'] = self.visible.to_s
el1['timestamp'] = self.timestamp.xmlschema
+ el1['version'] = self.version.to_s
+ el1['changeset'] = self.changeset_id.to_s
- user_display_name_cache = {} if user_display_name_cache.nil?
+ if changeset_cache.key?(self.changeset_id)
+ # use the cache if available
+ else
+ changeset_cache[self.changeset_id] = self.changeset.user_id
+ end
- if user_display_name_cache and user_display_name_cache.key?(self.user_id)
+ user_id = changeset_cache[self.changeset_id]
+
+ if user_display_name_cache.key?(user_id)
# use the cache if available
- elsif self.user.data_public?
- user_display_name_cache[self.user_id] = self.user.display_name
+ elsif self.changeset.user.data_public?
+ user_display_name_cache[user_id] = self.changeset.user.display_name
else
- user_display_name_cache[self.user_id] = nil
+ user_display_name_cache[user_id] = nil
end
- el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil?
+ if not user_display_name_cache[user_id].nil?
+ el1['user'] = user_display_name_cache[user_id]
+ el1['uid'] = user_id.to_s
+ end
# make sure nodes are output in sequence_id order
ordered_nodes = []
end
else
# otherwise, manually go to the db to check things
- if nd.node.visible? and nd.node.visible?
+ if nd.node and nd.node.visible?
ordered_nodes[nd.sequence_id] = nd.node_id.to_s
end
end
def add_tag_keyval(k, v)
@tags = Hash.new unless @tags
+
+ # duplicate tags are now forbidden, so we can't allow values
+ # in the hash to be overwritten.
+ raise OSM::APIDuplicateTagsError.new("way", self.id, k) if @tags.include? k
+
@tags[k] = v
end
+ ##
+ # the integer coords (i.e: unscaled) bounding box of the way, assuming
+ # straight line segments.
+ def bbox
+ lons = nodes.collect { |n| n.longitude }
+ lats = nodes.collect { |n| n.latitude }
+ [ lons.min, lats.min, lons.max, lats.max ]
+ end
+
+ def update_from(new_way, user)
+ Way.transaction do
+ self.lock!
+ check_consistency(self, new_way, user)
+ unless new_way.preconditions_ok?(self.nds)
+ raise OSM::APIPreconditionFailedError.new("Cannot update way #{self.id}: data is invalid.")
+ end
+
+ self.changeset_id = new_way.changeset_id
+ self.changeset = new_way.changeset
+ self.tags = new_way.tags
+ self.nds = new_way.nds
+ self.visible = true
+ save_with_history!
+ end
+ end
+
+ def create_with_history(user)
+ check_create_consistency(self, user)
+ unless self.preconditions_ok?
+ raise OSM::APIPreconditionFailedError.new("Cannot create way: data is invalid.")
+ end
+ self.version = 0
+ self.visible = true
+ save_with_history!
+ end
+
+ def preconditions_ok?(old_nodes = [])
+ return false if self.nds.empty?
+ if self.nds.length > APP_CONFIG['max_number_of_way_nodes']
+ raise OSM::APITooManyWayNodesError.new(self.id, self.nds.length, APP_CONFIG['max_number_of_way_nodes'])
+ end
+
+ # check only the new nodes, for efficiency - old nodes having been checked last time and can't
+ # be deleted when they're in-use.
+ new_nds = (self.nds - old_nodes).sort.uniq
+
+ unless new_nds.empty?
+ db_nds = Node.find(:all, :conditions => { :id => new_nds, :visible => true })
+
+ if db_nds.length < new_nds.length
+ missing = new_nds - db_nds.collect { |n| n.id }
+ raise OSM::APIPreconditionFailedError.new("Way #{self.id} requires the nodes with id in (#{missing.join(',')}), which either do not exist, or are not visible.")
+ end
+ end
+
+ return true
+ end
+
+ def delete_with_history!(new_way, user)
+ unless self.visible
+ raise OSM::APIAlreadyDeletedError.new("way", new_way.id)
+ end
+
+ # need to start the transaction here, so that the database can
+ # provide repeatable reads for the used-by checks. this means it
+ # shouldn't be possible to get race conditions.
+ Way.transaction do
+ self.lock!
+ check_consistency(self, new_way, user)
+ rel = RelationMember.find(:first, :joins => :relation,
+ :conditions => [ "visible = ? AND member_type='Way' and member_id=? ", true, self.id])
+ raise OSM::APIPreconditionFailedError.new("Way #{self.id} still used by relation #{rel.relation.id}.") if rel
+
+ self.changeset_id = new_way.changeset_id
+ self.changeset = new_way.changeset
+
+ self.tags = []
+ self.nds = []
+ self.visible = false
+ save_with_history!
+ end
+ end
+
+ # Temporary method to match interface to nodes
+ def tags_as_hash
+ return self.tags
+ end
+
+ ##
+ # if any referenced nodes are placeholder IDs (i.e: are negative) then
+ # this calling this method will fix them using the map from placeholders
+ # to IDs +id_map+.
+ def fix_placeholders!(id_map, placeholder_id = nil)
+ self.nds.map! do |node_id|
+ if node_id < 0
+ new_id = id_map[:node][node_id]
+ raise OSM::APIBadUserInput.new("Placeholder node not found for reference #{node_id} in way #{self.id.nil? ? placeholder_id : self.id}") if new_id.nil?
+ new_id
+ else
+ node_id
+ end
+ end
+ end
+
+ private
+
def save_with_history!
- t = Time.now
+ t = Time.now.getutc
+
+ # update the bounding box, note that this has to be done both before
+ # and after the save, so that nodes from both versions are included in the
+ # bbox. we use a copy of the changeset so that it isn't reloaded
+ # later in the save.
+ cs = self.changeset
+ cs.update_bbox!(bbox) unless nodes.empty?
Way.transaction do
+ self.version += 1
self.timestamp = t
self.save!
- end
- WayTag.transaction do
tags = self.tags
-
WayTag.delete_all(['id = ?', self.id])
-
tags.each do |k,v|
tag = WayTag.new
tag.k = k
tag.id = self.id
tag.save!
end
- end
- WayNode.transaction do
nds = self.nds
-
WayNode.delete_all(['id = ?', self.id])
-
sequence = 1
nds.each do |n|
nd = WayNode.new
nd.save!
sequence += 1
end
- end
- old_way = OldWay.from_way(self)
- old_way.timestamp = t
- old_way.save_with_dependencies!
- end
+ old_way = OldWay.from_way(self)
+ old_way.timestamp = t
+ old_way.save_with_dependencies!
- def preconditions_ok?
- return false if self.nds.empty?
- self.nds.each do |n|
- node = Node.find(:first, :conditions => ["id = ?", n])
- unless node and node.visible
- return false
- end
- end
- return true
- end
+ # reload the way so that the nodes array points to the correct
+ # new set of nodes.
+ self.reload
- # Delete the way and it's relations, but don't really delete it - set its visibility to false and update the history etc to maintain wiki-like functionality.
- def delete_with_relations_and_history(user)
- if self.visible
- # FIXME
- # this should actually delete the relations,
- # not just throw a PreconditionFailed if it's a member of a relation!!
- if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id",
- :conditions => [ "visible = 1 AND member_type='way' and member_id=?", self.id])
- raise OSM::APIPreconditionFailedError
- # end FIXME
- else
- self.user_id = user.id
- self.tags = []
- self.nds = []
- self.visible = false
- self.save_with_history!
- end
- else
- raise OSM::APIAlreadyDeletedError
- end
- end
-
- # delete a way and it's nodes that aren't part of other ways, with history
- def delete_with_relations_and_nodes_and_history(user)
- # delete the nodes not used by other ways
- self.unshared_node_ids.each do |node_id|
- n = Node.find(node_id)
- n.user_id = user.id
- n.visible = false
- n.save_with_history!
- end
-
- self.user_id = user.id
-
- self.delete_with_relations_and_history(user)
- end
+ # update and commit the bounding box, now that way nodes
+ # have been updated and we're in a transaction.
+ cs.update_bbox!(bbox) unless nodes.empty?
- # Find nodes that belong to this way only
- def unshared_node_ids
- node_ids = self.nodes.collect { |node| node.id }
+ # tell the changeset we updated one element only
+ cs.add_changes! 1
- unless node_ids.empty?
- way_nodes = WayNode.find(:all, :conditions => "node_id in (#{node_ids.join(',')}) and id != #{self.id}")
- node_ids = node_ids - way_nodes.collect { |way_node| way_node.node_id }
+ cs.save!
end
-
- return node_ids
end
- # Temporary method to match interface to nodes
- def tags_as_hash
- return self.tags
- end
end
projects / rails.git / blobdiff