158 lines
4.2 KiB
Ruby
158 lines
4.2 KiB
Ruby
class Node < ActiveRecord::Base
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require 'xml/libxml'
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include GeoRecord
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set_table_name 'current_nodes'
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validates_presence_of :user_id, :timestamp
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validates_inclusion_of :visible, :in => [ true, false ]
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validates_numericality_of :latitude, :longitude
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validate :validate_position
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belongs_to :user
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has_many :old_nodes, :foreign_key => :id
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has_many :way_nodes
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has_many :ways, :through => :way_nodes
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has_many :old_way_nodes
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has_many :ways_via_history, :class_name=> "Way", :through => :old_way_nodes, :source => :way
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has_many :containing_relation_members, :class_name => "RelationMember", :as => :member
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has_many :containing_relations, :class_name => "Relation", :through => :containing_relation_members, :source => :relation, :extend => ObjectFinder
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# Sanity check the latitude and longitude and add an error if it's broken
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def validate_position
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errors.add_to_base("Node is not in the world") unless in_world?
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end
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#
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# Search for nodes matching tags within bounding_box
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#
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# Also adheres to limitations such as within max_number_of_nodes
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#
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def self.search(bounding_box, tags = {})
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min_lon, min_lat, max_lon, max_lat = *bounding_box
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# @fixme a bit of a hack to search for only visible nodes
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# couldn't think of another to add to tags condition
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#conditions_hash = tags.merge({ 'visible' => 1 })
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# using named placeholders http://www.robbyonrails.com/articles/2005/10/21/using-named-placeholders-in-ruby
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#keys = []
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#values = {}
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#conditions_hash.each do |key,value|
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# keys << "#{key} = :#{key}"
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# values[key.to_sym] = value
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#end
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#conditions = keys.join(' AND ')
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find_by_area(min_lat, min_lon, max_lat, max_lon,
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:conditions => 'visible = 1',
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:limit => APP_CONFIG['max_number_of_nodes']+1)
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end
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# Read in xml as text and return it's Node object representation
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def self.from_xml(xml, create=false)
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begin
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p = XML::Parser.string(xml)
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doc = p.parse
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node = Node.new
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doc.find('//osm/node').each do |pt|
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node.lat = pt['lat'].to_f
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node.lon = pt['lon'].to_f
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return nil unless node.in_world?
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unless create
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if pt['id'] != '0'
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node.id = pt['id'].to_i
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end
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end
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node.visible = pt['visible'] and pt['visible'] == 'true'
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if create
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node.timestamp = Time.now
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else
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if pt['timestamp']
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node.timestamp = Time.parse(pt['timestamp'])
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end
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end
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tags = []
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pt.find('tag').each do |tag|
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tags << [tag['k'],tag['v']]
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end
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node.tags = Tags.join(tags)
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end
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rescue
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node = nil
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end
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return node
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end
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# Save this node with the appropriate OldNode object to represent it's history.
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def save_with_history!
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Node.transaction do
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self.timestamp = Time.now
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self.save!
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old_node = OldNode.from_node(self)
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old_node.save!
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end
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end
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# Turn this Node in to a complete OSM XML object with <osm> wrapper
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def to_xml
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doc = OSM::API.new.get_xml_doc
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doc.root << to_xml_node()
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return doc
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end
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# Turn this Node in to an XML Node without the <osm> wrapper.
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def to_xml_node(user_display_name_cache = nil)
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el1 = XML::Node.new 'node'
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el1['id'] = self.id.to_s
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el1['lat'] = self.lat.to_s
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el1['lon'] = self.lon.to_s
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user_display_name_cache = {} if user_display_name_cache.nil?
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if user_display_name_cache and user_display_name_cache.key?(self.user_id)
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# use the cache if available
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elsif self.user.data_public?
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user_display_name_cache[self.user_id] = self.user.display_name
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else
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user_display_name_cache[self.user_id] = nil
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end
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el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil?
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Tags.split(self.tags) do |k,v|
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el2 = XML::Node.new('tag')
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el2['k'] = k.to_s
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el2['v'] = v.to_s
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el1 << el2
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end
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el1['visible'] = self.visible.to_s
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el1['timestamp'] = self.timestamp.xmlschema
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return el1
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end
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# Return the node's tags as a Hash of keys and their values
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def tags_as_hash
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hash = {}
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Tags.split(self.tags) do |k,v|
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hash[k] = v
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end
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hash
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end
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end
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