343 lines
10 KiB
Ruby
343 lines
10 KiB
Ruby
class Way < ActiveRecord::Base
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require 'xml/libxml'
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include ConsistencyValidations
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include NotRedactable
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include ObjectMetadata
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self.table_name = "current_ways"
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belongs_to :changeset
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has_many :old_ways, -> { order(:version) }
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has_many :way_nodes, -> { order(:sequence_id) }
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has_many :nodes, -> { order("sequence_id") }, :through => :way_nodes
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has_many :way_tags
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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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validates_presence_of :id, :on => :update
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validates_presence_of :changeset_id,:version, :timestamp
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validates_uniqueness_of :id
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validates_inclusion_of :visible, :in => [ true, false ]
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validates_numericality_of :changeset_id, :version, :integer_only => true
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validates_numericality_of :id, :on => :update, :integer_only => true
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validates_associated :changeset
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scope :visible, -> { where(:visible => true) }
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scope :invisible, -> { where(:visible => false) }
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# Read in xml as text and return it's Way 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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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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raise OSM::APIBadXMLError.new("node", xml, "XML doesn't contain an osm/way element.")
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rescue LibXML::XML::Error, ArgumentError => ex
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raise OSM::APIBadXMLError.new("way", xml, ex.message)
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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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raise OSM::APIBadXMLError.new("way", pt, "Version is required when updating") unless create or not pt['version'].nil?
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way.version = pt['version']
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raise OSM::APIBadXMLError.new("way", pt, "Changeset id is missing") if pt['changeset'].nil?
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way.changeset_id = pt['changeset']
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unless create
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raise OSM::APIBadXMLError.new("way", pt, "ID is required when updating") if pt['id'].nil?
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way.id = pt['id'].to_i
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# .to_i will return 0 if there is no number that can be parsed.
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# We want to make sure that there is no id with zero anyway
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raise OSM::APIBadUserInput.new("ID of way cannot be zero when updating.") if way.id == 0
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end
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# We don't care about the timestamp nor the visibility as these are either
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# set explicitly or implicit in the action. The visibility is set to true,
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# and manually set to false before the actual delete.
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way.visible = true
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# Start with no tags
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way.tags = Hash.new
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# Add in any tags from the XML
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pt.find('tag').each do |tag|
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raise OSM::APIBadXMLError.new("way", pt, "tag is missing key") if tag['k'].nil?
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raise OSM::APIBadXMLError.new("way", pt, "tag is missing value") if tag['v'].nil?
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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, changeset_cache = {}, user_display_name_cache = {})
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el1 = XML::Node.new 'way'
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el1['id'] = self.id.to_s
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add_metadata_to_xml_node(el1, self, changeset_cache, user_display_name_cache)
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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 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("way", self.id, k) if @tags.include? k
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@tags[k] = v
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end
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##
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# the integer coords (i.e: unscaled) bounding box of the way, assuming
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# straight line segments.
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def bbox
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lons = nodes.collect { |n| n.longitude }
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lats = nodes.collect { |n| n.latitude }
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BoundingBox.new(lons.min, lats.min, lons.max, lats.max)
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end
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def update_from(new_way, user)
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Way.transaction do
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self.lock!
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check_consistency(self, new_way, user)
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unless new_way.preconditions_ok?(self.nds)
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raise OSM::APIPreconditionFailedError.new("Cannot update way #{self.id}: data is invalid.")
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end
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self.changeset_id = new_way.changeset_id
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self.changeset = new_way.changeset
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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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end
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def create_with_history(user)
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check_create_consistency(self, user)
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unless self.preconditions_ok?
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raise OSM::APIPreconditionFailedError.new("Cannot create way: data is invalid.")
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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?(old_nodes = [])
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return false if self.nds.empty?
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if self.nds.length > MAX_NUMBER_OF_WAY_NODES
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raise OSM::APITooManyWayNodesError.new(self.id, self.nds.length, MAX_NUMBER_OF_WAY_NODES)
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end
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# check only the new nodes, for efficiency - old nodes having been checked last time and can't
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# be deleted when they're in-use.
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new_nds = (self.nds - old_nodes).sort.uniq
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unless new_nds.empty?
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db_nds = Node.where(:id => new_nds, :visible => true)
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if db_nds.length < new_nds.length
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missing = new_nds - db_nds.collect { |n| n.id }
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raise OSM::APIPreconditionFailedError.new("Way #{self.id} requires the nodes with id in (#{missing.join(',')}), which either do not exist, or are not visible.")
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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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unless self.visible
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raise OSM::APIAlreadyDeletedError.new("way", new_way.id)
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end
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# need to start the transaction here, so that the database can
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# provide repeatable reads for the used-by checks. this means it
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# shouldn't be possible to get race conditions.
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Way.transaction do
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self.lock!
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check_consistency(self, new_way, user)
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rels = Relation.joins(:relation_members).where(:visible => true, :current_relation_members => { :member_type => "Way", :member_id => id }).order(:id)
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raise OSM::APIPreconditionFailedError.new("Way #{self.id} is still used by relations #{rels.collect { |r| r.id }.join(",")}.") unless rels.empty?
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self.changeset_id = new_way.changeset_id
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self.changeset = new_way.changeset
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self.tags = []
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self.nds = []
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self.visible = false
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save_with_history!
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end
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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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##
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# if any referenced nodes are placeholder IDs (i.e: are negative) then
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# this calling this method will fix them using the map from placeholders
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# to IDs +id_map+.
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def fix_placeholders!(id_map, placeholder_id = nil)
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self.nds.map! do |node_id|
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if node_id < 0
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new_id = id_map[:node][node_id]
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raise OSM::APIBadUserInput.new("Placeholder node not found for reference #{node_id} in way #{self.id.nil? ? placeholder_id : self.id}") if new_id.nil?
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new_id
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else
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node_id
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end
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end
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end
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private
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def save_with_history!
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t = Time.now.getutc
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# update the bounding box, note that this has to be done both before
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# and after the save, so that nodes from both versions are included in the
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# bbox. we use a copy of the changeset so that it isn't reloaded
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# later in the save.
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cs = self.changeset
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cs.update_bbox!(bbox) unless nodes.empty?
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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(:way_id => self.id)
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tags.each do |k,v|
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tag = WayTag.new
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tag.way_id = self.id
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tag.k = k
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tag.v = v
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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(:way_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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# reload the way so that the nodes array points to the correct
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# new set of nodes.
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self.reload
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# update and commit the bounding box, now that way nodes
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# have been updated and we're in a transaction.
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cs.update_bbox!(bbox) unless nodes.empty?
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# tell the changeset we updated one element only
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cs.add_changes! 1
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cs.save!
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end
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end
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end
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