307 lines
7.8 KiB
Ruby
307 lines
7.8 KiB
Ruby
class Way < ActiveRecord::Base
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require 'xml/libxml'
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include ConsistencyValidations
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set_table_name 'current_ways'
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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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belongs_to :changeset
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has_many :old_ways, :foreign_key => 'id', :order => 'version'
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has_many :way_nodes, :foreign_key => 'id', :order => 'sequence_id'
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has_many :nodes, :through => :way_nodes, :order => 'sequence_id'
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has_many :way_tags, :foreign_key => 'id'
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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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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/way').each do |pt|
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return Way.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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way = Way.new
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if !create and pt['id'] != '0'
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way.id = pt['id'].to_i
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end
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way.version = pt['version']
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way.changeset_id = pt['changeset']
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if create
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way.timestamp = Time.now
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way.visible = true
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else
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if pt['timestamp']
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way.timestamp = Time.parse(pt['timestamp'])
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end
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end
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pt.find('tag').each do |tag|
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way.add_tag_keyval(tag['k'], tag['v'])
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end
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pt.find('nd').each do |nd|
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way.add_nd_num(nd['ref'])
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end
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return way
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end
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# Find a way given it's ID, and in a single SQL call also grab its nodes
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#
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# You can't pull in all the tags too unless we put a sequence_id on the way_tags table and have a multipart key
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def self.find_eager(id)
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way = Way.find(id, :include => {:way_nodes => :node})
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#If waytag had a multipart key that was real, you could do this:
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#way = Way.find(id, :include => [:way_tags, {:way_nodes => :node}])
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end
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# Find a way given it's ID, and in a single SQL call also grab its nodes and tags
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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(visible_nodes = nil, user_display_name_cache = nil)
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el1 = XML::Node.new 'way'
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el1['id'] = self.id.to_s
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el1['visible'] = self.visible.to_s
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el1['timestamp'] = self.timestamp.xmlschema
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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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# make sure nodes are output in sequence_id order
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ordered_nodes = []
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self.way_nodes.each do |nd|
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if visible_nodes
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# if there is a list of visible nodes then use that to weed out deleted nodes
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if visible_nodes[nd.node_id]
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ordered_nodes[nd.sequence_id] = nd.node_id.to_s
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end
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else
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# otherwise, manually go to the db to check things
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if nd.node.visible? and nd.node.visible?
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ordered_nodes[nd.sequence_id] = nd.node_id.to_s
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end
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end
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end
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ordered_nodes.each do |nd_id|
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if nd_id and nd_id != '0'
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e = XML::Node.new 'nd'
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e['ref'] = nd_id
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el1 << e
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end
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end
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self.way_tags.each do |tag|
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e = XML::Node.new 'tag'
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e['k'] = tag.k
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e['v'] = tag.v
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el1 << e
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end
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return el1
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end
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def nds
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unless @nds
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@nds = Array.new
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self.way_nodes.each do |nd|
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@nds += [nd.node_id]
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end
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end
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@nds
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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.way_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 nds=(s)
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@nds = s
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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_nd_num(n)
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@nds = Array.new unless @nds
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@nds << n.to_i
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end
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def add_tag_keyval(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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def save_with_history!
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t = Time.now
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Way.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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tags = self.tags
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WayTag.delete_all(['id = ?', self.id])
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tags.each do |k,v|
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tag = WayTag.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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nds = self.nds
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WayNode.delete_all(['id = ?', self.id])
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sequence = 1
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nds.each do |n|
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nd = WayNode.new
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nd.id = [self.id, sequence]
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nd.node_id = n
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nd.save!
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sequence += 1
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end
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old_way = OldWay.from_way(self)
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old_way.timestamp = t
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old_way.save_with_dependencies!
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end
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end
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def update_from(new_way, user)
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check_consistency(self, new_way, user)
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if !new_way.preconditions_ok?
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raise OSM::APIPreconditionFailedError.new
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end
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self.changeset_id = new_way.changeset_id
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self.tags = new_way.tags
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self.nds = new_way.nds
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self.visible = true
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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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if !self.preconditions_ok?
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raise OSM::APIPreconditionFailedError.new
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end
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self.version = 0
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self.visible = true
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save_with_history!
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end
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def preconditions_ok?
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return false if self.nds.empty?
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self.nds.each do |n|
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node = Node.find(:first, :conditions => ["id = ?", n])
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unless node and node.visible
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return false
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end
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end
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return true
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end
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def delete_with_history(new_way, user)
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check_consistency(self, new_way, user)
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if self.visible
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# FIXME
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# this should actually delete the relations,
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# not just throw a PreconditionFailed if it's a member of a relation!!
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# WHY?? The editor should decide whether the node is in the relation or not!
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# FIXME: this should probably renamed to delete_with_history
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if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id",
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:conditions => [ "visible = 1 AND member_type='way' and member_id=?", self.id])
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raise OSM::APIPreconditionFailedError
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# end FIXME
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else
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self.changeset_id = new_way.changeset_id
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self.tags = []
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self.nds = []
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self.visible = false
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self.save_with_history!
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end
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else
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raise OSM::APIAlreadyDeletedError
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end
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end
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# delete a way and it's nodes that aren't part of other ways, with history
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# FIXME: merge the potlatch code to delete the relations
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def delete_with_relations_and_nodes_and_history(user)
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# delete the nodes not used by other ways
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self.unshared_node_ids.each do |node_id|
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n = Node.find(node_id)
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n.user_id = user.id
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n.visible = false
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n.save_with_history!
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end
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# FIXME needs more information passed in so that the changeset can be updated
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self.user_id = user.id
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self.delete_with_history(user)
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end
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# Find nodes that belong to this way only
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def unshared_node_ids
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node_ids = self.nodes.collect { |node| node.id }
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unless node_ids.empty?
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way_nodes = WayNode.find(:all, :conditions => "node_id in (#{node_ids.join(',')}) and id != #{self.id}")
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node_ids = node_ids - way_nodes.collect { |way_node| way_node.node_id }
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end
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return node_ids
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end
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# Temporary method to match interface to nodes
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def tags_as_hash
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return self.tags
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end
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end
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