274 lines
7.2 KiB
Ruby
274 lines
7.2 KiB
Ruby
class Node < ActiveRecord::Base
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require 'xml/libxml'
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include GeoRecord
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include ConsistencyValidations
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set_table_name 'current_nodes'
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validates_presence_of :changeset_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 :changeset
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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 :node_tags, :foreign_key => :id
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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.new
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p.string = xml
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doc = p.parse
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doc.find('//osm/node').each do |pt|
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return Node.from_xml_node(pt, create)
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end
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rescue
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return nil
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end
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end
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def self.from_xml_node(pt, create=false)
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node = Node.new
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node.lat = pt['lat'].to_f
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node.lon = pt['lon'].to_f
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node.changeset_id = pt['changeset'].to_i
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return nil unless node.in_world?
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# version must be present unless creating
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return nil unless create or not pt['version'].nil?
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node.version = pt['version'].to_i
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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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# visible if it says it is, or as the default if the attribute
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# is missing.
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node.visible = pt['visible'].nil? or 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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node.add_tag_key_val(tag['k'],tag['v'])
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end
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return node
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end
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##
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# the bounding box around a node
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def bbox
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[ longitude, latitude, longitude, latitude ]
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end
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def save_with_history!
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t = Time.now
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Node.transaction do
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self.version += 1
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self.timestamp = t
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self.save!
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# Create a NodeTag
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tags = self.tags
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NodeTag.delete_all(['id = ?', self.id])
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tags.each do |k,v|
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tag = NodeTag.new
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tag.k = k
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tag.v = v
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tag.id = self.id
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tag.save!
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end
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# Create an OldNode
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old_node = OldNode.from_node(self)
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old_node.timestamp = t
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old_node.save_with_dependencies!
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# save the changeset in case of bounding box updates
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changeset.save!
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end
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end
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# Should probably be renamed delete_from to come in line with update
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def delete_with_history!(new_node, user)
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if self.visible
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check_consistency(self, new_node, user)
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if WayNode.find(:first, :joins => "INNER JOIN current_ways ON current_ways.id = current_way_nodes.id", :conditions => [ "current_ways.visible = 1 AND current_way_nodes.node_id = ?", self.id ])
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raise OSM::APIPreconditionFailedError.new
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elsif RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = 1 AND member_type='node' and member_id=? ", self.id])
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raise OSM::APIPreconditionFailedError.new
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else
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self.changeset_id = new_node.changeset_id
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self.visible = 0
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# update the changeset with the deleted position
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changeset.update_bbox!(bbox)
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save_with_history!
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end
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else
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raise OSM::APIAlreadyDeletedError.new
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end
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end
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def update_from(new_node, user)
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check_consistency(self, new_node, user)
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# update changeset with *old* position first
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changeset.update_bbox!(bbox);
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# FIXME logic needs to be double checked
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self.changeset_id = new_node.changeset_id
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self.latitude = new_node.latitude
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self.longitude = new_node.longitude
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self.tags = new_node.tags
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self.visible = true
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# update changeset with *new* position
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changeset.update_bbox!(bbox);
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save_with_history!
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end
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def create_with_history(user)
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check_create_consistency(self, user)
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self.version = 0
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self.visible = true
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# update the changeset to include the new location
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changeset.update_bbox!(bbox)
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save_with_history!
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end
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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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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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el1['version'] = self.version.to_s
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el1['changeset'] = self.changeset_id.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.changeset.user_id)
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# use the cache if available
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elsif self.changeset.user.data_public?
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user_display_name_cache[self.changeset.user_id] = self.changeset.user.display_name
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else
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user_display_name_cache[self.changeset.user_id] = nil
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end
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el1['user'] = user_display_name_cache[self.changeset.user_id] unless user_display_name_cache[self.changeset.user_id].nil?
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self.tags.each 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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def tags_as_hash
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return tags
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end
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def tags
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unless @tags
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@tags = {}
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self.node_tags.each do |tag|
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@tags[tag.k] = tag.v
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end
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end
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@tags
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end
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def tags=(t)
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@tags = t
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end
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def add_tag_key_val(k,v)
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@tags = Hash.new unless @tags
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# duplicate tags are now forbidden, so we can't allow values
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# in the hash to be overwritten.
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raise OSM::APIDuplicateTagsError.new if @tags.include? k
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@tags[k] = v
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end
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##
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# dummy method to make the interfaces of node, way and relation
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# more consistent.
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def fix_placeholders!(id_map)
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# nodes don't refer to anything, so there is nothing to do here
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end
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end
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