-class Node < ActiveRecord::Base
+# The node model represents a current existing node, that is, the latest version. Use OldNode for historical nodes.
+
+class Node < GeoRecord
require 'xml/libxml'
+
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
has_many :old_nodes, :foreign_key => :id
+ has_many :way_nodes
belongs_to :user
+
+ # Sanity check the latitude and longitude and add an error if it's broken
+ def validate_position
+ errors.add_to_base("Node is not in the world") unless in_world?
+ end
+ # Is this node withing -90 > latitude > 90 and -180 > longitude > 180>
+ # * returns true/false
+ def in_world?
+ return false if self.lat < -90 or self.lat > 90
+ return false if self.lon < -180 or self.lon > 180
+ return true
+ end
+ #
+ # Search for nodes matching tags within bounding_box
+ #
+ # Also adheres to limitations such as within max_number_of_nodes
+ #
+ def self.search(bounding_box, tags = {})
+ min_lon, min_lat, max_lon, max_lat = *bounding_box
+ # @fixme a bit of a hack to search for only visible nodes
+ # couldn't think of another to add to tags condition
+ #conditions_hash = tags.merge({ 'visible' => 1 })
+
+ # using named placeholders http://www.robbyonrails.com/articles/2005/10/21/using-named-placeholders-in-ruby
+ #keys = []
+ #values = {}
+
+ #conditions_hash.each do |key,value|
+ # keys << "#{key} = :#{key}"
+ # values[key.to_sym] = value
+ #end
+ #conditions = keys.join(' AND ')
+
+ find_by_area(min_lat, min_lon, max_lat, max_lon,
+ :conditions => 'visible = 1',
+ :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)
- p = XML::Parser.new
- p.string = xml
- doc = p.parse
-
- node = Node.new
-
- doc.find('//osm/node').each do |pt|
+ begin
+ p = XML::Parser.new
+ p.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
- node.latitude = pt['lat'].to_f
- node.longitude = pt['lon'].to_f
+ return nil unless node.in_world?
- if node.latitude > 90 or node.latitude < -90 or node.longitude > 180 or node.longitude < -180
- return nil
- end
+ unless create
+ if pt['id'] != '0'
+ node.id = pt['id'].to_i
+ end
+ end
- if pt['id'] != '0'
- node.id = pt['id'].to_i
- end
+ node.visible = pt['visible'] and pt['visible'] == 'true'
- node.visible = pt['visible'] == '1'
+ if create
+ node.timestamp = Time.now
+ else
+ if pt['timestamp']
+ node.timestamp = Time.parse(pt['timestamp'])
+ end
+ end
- if create
- node.timestamp = Time.now
- else
- node.timestamp = Time.parse(pt['timestamp'])
- end
+ tags = []
- tags = []
+ pt.find('tag').each do |tag|
+ tags << [tag['k'],tag['v']]
+ end
- pt.find('tag').each do |tag|
- tags << [tag['k'],tag['v']]
+ node.tags = Tags.join(tags)
end
-
- tags = tags.collect { |k,v| "#{k}=#{v}" }.join(';')
- tags = '' if tags.nil?
-
- node.tags = tags
-
+ rescue
+ node = nil
end
+
return node
end
- def save_with_history
- begin
- Node.transaction do
- old_node = OldNode.from_node(this)
- this.save
- old_node.save
- end
- return true
- rescue Exception => ex
- return nil
-
+ # Save this node with the appropriate OldNode object to represent it's history.
+ def save_with_history!
+ Node.transaction do
+ self.timestamp = Time.now
+ self.save!
+ old_node = OldNode.from_node(self)
+ old_node.save!
end
end
- def self.to_xml
- doc = XML::Document.new
+ # 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
- doc.encoding = "UTF-8"
- root = XML::Node.new 'osm'
- root['version'] = '0.4'
- root['generator'] = 'OpenStreetMap server'
- doc.root = root
+ # Turn this Node in to an XML Node without the <osm> wrapper.
+ def to_xml_node(user_display_name_cache = nil)
el1 = XML::Node.new 'node'
- el1['id'] = this.id.to_s
- el1['lat'] = this.latitude.to_s
- el1['lon'] = this.longitude.to_s
- split_tags(el1, this.tags)
- el1['visible'] = thiss.visible.to_s
- el1['timestamp'] = this.timestamp.xmlschema
- root << el1
+ el1['id'] = self.id.to_s
+ el1['lat'] = self.lat.to_s
+ el1['lon'] = self.lon.to_s
+
+ user_display_name_cache = {} if user_display_name_cache.nil?
+
+ if user_display_name_cache and user_display_name_cache.key?(self.user_id)
+ # use the cache if available
+ elsif self.user.data_public?
+ user_display_name_cache[self.user_id] = self.user.display_name
+ else
+ user_display_name_cache[self.user_id] = nil
+ end
- return root
+ el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil?
- end
+ Tags.split(self.tags) do |k,v|
+ el2 = XML::Node.new('tag')
+ el2['k'] = k.to_s
+ el2['v'] = v.to_s
+ el1 << el2
+ end
+ el1['visible'] = self.visible.to_s
+ el1['timestamp'] = self.timestamp.xmlschema
+ return el1
+ end
- private
- def split_tags(el, tags)
- tags.split(';').each do |tag|
- parts = tag.split('=')
- key = ''
- val = ''
- key = parts[0].strip unless parts[0].nil?
- val = parts[1].strip unless parts[1].nil?
- if key != '' && val != ''
- el2 = Node.new('tag')
- el2['k'] = key.to_s
- el2['v'] = val.to_s
- el << el2
- 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
end
+ hash
end
-
-
-
end
projects / rails.git / blobdiff