-# The node model represents a current existing node, that is, the latest version. Use OldNode for historical nodes.
-
-class Node < GeoRecord
+class Node < ActiveRecord::Base
require 'xml/libxml'
+ include GeoRecord
+ include ConsistencyValidations
+
set_table_name 'current_nodes'
-
- validates_presence_of :user_id, :timestamp
- validates_inclusion_of :visible, :in => [ true, false ]
- validates_numericality_of :latitude, :longitude
- validate :validate_position
- belongs_to :user
+ belongs_to :changeset
has_many :old_nodes, :foreign_key => :id
has_many :way_nodes
has_many :ways, :through => :way_nodes
- has_many :containing_relation_members, :as => :member
- has_many :containing_relations, :through => :containing_relation_members
+ has_many :node_tags, :foreign_key => :id
+
+ has_many :old_way_nodes
+ has_many :ways_via_history, :class_name=> "Way", :through => :old_way_nodes, :source => :way
+
+ 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 :timestamp,:version, :changeset_id
+ validates_uniqueness_of :id
+ validates_inclusion_of :visible, :in => [ true, false ]
+ validates_numericality_of :latitude, :longitude, :changeset_id, :version, :integer_only => true
+ validates_numericality_of :id, :on => :update, :integer_only => true
+ validate :validate_position
+ validates_associated :changeset
# Sanity check the latitude and longitude and add an error if it's broken
def validate_position
#conditions = keys.join(' AND ')
find_by_area(min_lat, min_lon, max_lat, max_lon,
- :conditions => 'visible = 1',
+ :conditions => {:visible => true},
:limit => APP_CONFIG['max_number_of_nodes']+1)
end
# Read in xml as text and return it's Node 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
-
- node = Node.new
doc.find('//osm/node').each do |pt|
- node.lat = pt['lat'].to_f
- node.lon = pt['lon'].to_f
-
- return nil unless node.in_world?
+ return Node.from_xml_node(pt, create)
+ end
+ rescue LibXML::XML::Error, ArgumentError => ex
+ raise OSM::APIBadXMLError.new("node", xml, ex.message)
+ end
+ end
- unless create
- if pt['id'] != '0'
- node.id = pt['id'].to_i
- end
- end
+ def self.from_xml_node(pt, create=false)
+ node = Node.new
+
+ raise OSM::APIBadXMLError.new("node", pt, "lat missing") if pt['lat'].nil?
+ raise OSM::APIBadXMLError.new("node", pt, "lon missing") if pt['lon'].nil?
+ node.lat = pt['lat'].to_f
+ node.lon = pt['lon'].to_f
+ raise OSM::APIBadXMLError.new("node", pt, "Changeset id is missing") if pt['changeset'].nil?
+ node.changeset_id = pt['changeset'].to_i
- node.visible = pt['visible'] and pt['visible'] == 'true'
+ raise OSM::APIBadUserInput.new("The node is outside this world") unless node.in_world?
- if create
- node.timestamp = Time.now
- else
- if pt['timestamp']
- node.timestamp = Time.parse(pt['timestamp'])
- end
- end
+ # version must be present unless creating
+ raise OSM::APIBadXMLError.new("node", pt, "Version is required when updating") unless create or not pt['version'].nil?
+ node.version = create ? 0 : pt['version'].to_i
- tags = []
+ unless create
+ raise OSM::APIBadXMLError.new("node", pt, "ID is required when updating.") if pt['id'].nil?
+ node.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 node cannot be zero when updating.") if node.id == 0
+ end
- pt.find('tag').each do |tag|
- tags << [tag['k'],tag['v']]
- end
+ # We don't care about the time, as it is explicitly set on create/update/delete
+ # We don't care about the visibility as it is implicit based on the action
+ # and set manually before the actual delete
+ node.visible = true
- node.tags = Tags.join(tags)
- end
- rescue
- node = nil
+ pt.find('tag').each do |tag|
+ raise OSM::APIBadXMLError.new("node", pt, "tag is missing key") if tag['k'].nil?
+ raise OSM::APIBadXMLError.new("node", pt, "tag is missing value") if tag['v'].nil?
+ node.add_tag_key_val(tag['k'],tag['v'])
end
return node
end
- # Save this node with the appropriate OldNode object to represent it's history.
- def save_with_history!
+ ##
+ # the bounding box around a node, which is used for determining the changeset's
+ # bounding box
+ def bbox
+ [ longitude, latitude, longitude, latitude ]
+ end
+
+ # Should probably be renamed delete_from to come in line with update
+ def delete_with_history!(new_node, user)
+ unless self.visible
+ raise OSM::APIAlreadyDeletedError.new("node", new_node.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.
Node.transaction do
- self.timestamp = Time.now
- self.save!
- old_node = OldNode.from_node(self)
- old_node.save!
+ self.lock!
+ check_consistency(self, new_node, user)
+ way = WayNode.find(:first, :joins => :way,
+ :conditions => [ "current_ways.visible = ? AND current_way_nodes.node_id = ?", true, self.id ])
+ raise OSM::APIPreconditionFailedError.new("Node #{self.id} is still used by way #{way.way.id}.") unless way.nil?
+
+ rel = RelationMember.find(:first, :joins => :relation,
+ :conditions => [ "visible = ? AND member_type='Node' and member_id=? ", true, self.id])
+ raise OSM::APIPreconditionFailedError.new("Node #{self.id} is still used by relation #{rel.relation.id}.") unless rel.nil?
+
+ self.changeset_id = new_node.changeset_id
+ self.visible = false
+
+ # update the changeset with the deleted position
+ changeset.update_bbox!(bbox)
+
+ save_with_history!
+ end
+ end
+
+ def update_from(new_node, user)
+ Node.transaction do
+ self.lock!
+ check_consistency(self, new_node, user)
+
+ # update changeset first
+ self.changeset_id = new_node.changeset_id
+ self.changeset = new_node.changeset
+
+ # update changeset bbox with *old* position first
+ changeset.update_bbox!(bbox);
+
+ # FIXME logic needs to be double checked
+ self.latitude = new_node.latitude
+ self.longitude = new_node.longitude
+ self.tags = new_node.tags
+ self.visible = true
+
+ # update changeset bbox with *new* position
+ changeset.update_bbox!(bbox);
+
+ save_with_history!
end
end
+
+ def create_with_history(user)
+ check_create_consistency(self, user)
+ self.version = 0
+ self.visible = true
+
+ # update the changeset to include the new location
+ changeset.update_bbox!(bbox)
+
+ save_with_history!
+ end
- # Turn this Node in to a complete OSM XML object with <osm> wrapper
def to_xml
doc = OSM::API.new.get_xml_doc
doc.root << to_xml_node()
return doc
end
- # Turn this Node in to an XML Node without the <osm> wrapper.
- def to_xml_node(user_display_name_cache = nil)
+ def to_xml_node(changeset_cache = {}, user_display_name_cache = {})
el1 = XML::Node.new 'node'
el1['id'] = self.id.to_s
el1['lat'] = self.lat.to_s
el1['lon'] = self.lon.to_s
+ el1['version'] = self.version.to_s
+ el1['changeset'] = self.changeset_id.to_s
+
+ if changeset_cache.key?(self.changeset_id)
+ # use the cache if available
+ else
+ changeset_cache[self.changeset_id] = self.changeset.user_id
+ end
- user_display_name_cache = {} if user_display_name_cache.nil?
+ user_id = changeset_cache[self.changeset_id]
- if user_display_name_cache and user_display_name_cache.key?(self.user_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
- Tags.split(self.tags) do |k,v|
+ self.tags.each do |k,v|
el2 = XML::Node.new('tag')
el2['k'] = k.to_s
el2['v'] = v.to_s
return el1
end
- # Return the node's tags as a Hash of keys and their values
def tags_as_hash
- hash = {}
- Tags.split(self.tags) do |k,v|
- hash[k] = v
+ return tags
+ end
+
+ def tags
+ unless @tags
+ @tags = {}
+ self.node_tags.each do |tag|
+ @tags[tag.k] = tag.v
+ end
end
- hash
+ @tags
+ end
+
+ def tags=(t)
+ @tags = t
+ end
+
+ def add_tag_key_val(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("node", self.id, k) if @tags.include? k
+
+ @tags[k] = v
+ end
+
+ ##
+ # are the preconditions OK? this is mainly here to keep the duck
+ # typing interface the same between nodes, ways and relations.
+ def preconditions_ok?
+ in_world?
end
+
+ ##
+ # dummy method to make the interfaces of node, way and relation
+ # more consistent.
+ def fix_placeholders!(id_map, placeholder_id = nil)
+ # nodes don't refer to anything, so there is nothing to do here
+ end
+
+ private
+
+ def save_with_history!
+ t = Time.now.getutc
+ Node.transaction do
+ self.version += 1
+ self.timestamp = t
+ self.save!
+
+ # Create a NodeTag
+ tags = self.tags
+ NodeTag.delete_all(['id = ?', self.id])
+ tags.each do |k,v|
+ tag = NodeTag.new
+ tag.k = k
+ tag.v = v
+ tag.id = self.id
+ tag.save!
+ end
+
+ # Create an OldNode
+ old_node = OldNode.from_node(self)
+ old_node.timestamp = t
+ old_node.save_with_dependencies!
+
+ # tell the changeset we updated one element only
+ changeset.add_changes! 1
+
+ # save the changeset in case of bounding box updates
+ changeset.save!
+ end
+ end
+
end
projects / rails.git / blobdiff