X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/2803612d9db2f89c4eaa57bbf4606b56967caa62..dc2a95903722644f6109244cec9a2d1e195fef0e:/app/models/node.rb

diff --git a/app/models/node.rb b/app/models/node.rb
index 91f348f19..67efeca2c 100644
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -1,111 +1,250 @@
 class Node < ActiveRecord::Base
   require 'xml/libxml'
+
+  include GeoRecord
+  include ConsistencyValidations
+
   set_table_name 'current_nodes'
 
-  validates_numericality_of :latitude
-  validates_numericality_of :longitude
-  # FIXME validate lat and lon within the world
+  validates_presence_of :changeset_id, :timestamp
+  validates_inclusion_of :visible, :in => [ true, false ]
+  validates_numericality_of :latitude, :longitude
+  validate :validate_position
+
+  belongs_to :changeset
 
   has_many :old_nodes, :foreign_key => :id
-  belongs_to :user
 
+  has_many :way_nodes
+  has_many :ways, :through => :way_nodes
 
-  def self.from_xml(xml, create=false)
-    p = XML::Parser.new
-    p.string = xml
-    doc = p.parse
+  has_many :node_tags, :foreign_key => :id
+  
+  has_many :old_way_nodes
+  has_many :ways_via_history, :class_name=> "Way", :through => :old_way_nodes, :source => :way
 
-    node = Node.new
+  has_many :containing_relation_members, :class_name => "RelationMember", :as => :member
+  has_many :containing_relations, :class_name => "Relation", :through => :containing_relation_members, :source => :relation, :extend => ObjectFinder
 
-    doc.find('//osm/node').each do |pt|
+  # 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
 
+  #
+  # 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
 
-      node.latitude = pt['lat'].to_f
-      node.longitude = pt['lon'].to_f
+  # Read in xml as text and return it's Node object representation
+  def self.from_xml(xml, create=false)
+    begin
+      p = XML::Parser.new
+      p.string = xml
+      doc = p.parse
 
-      if node.latitude > 90 or node.latitude < -90 or node.longitude > 180 or node.longitude < -180
-        return nil
+      doc.find('//osm/node').each do |pt|
+        return Node.from_xml_node(pt, create)
       end
+    rescue
+      return nil
+    end
+  end
 
-      unless create
-        if pt['id'] != '0'
-          node.id = pt['id'].to_i
-        end
-      end
+  def self.from_xml_node(pt, create=false)
+    node = Node.new
+    
+    node.lat = pt['lat'].to_f
+    node.lon = pt['lon'].to_f
+    node.changeset_id = pt['changeset'].to_i
 
-      node.visible = pt['visible'] and pt['visible'] == 'true'
+    return nil unless node.in_world?
 
-      if create
-        node.timestamp = Time.now
-      else
-        if pt['timestamp']
-          node.timestamp = Time.parse(pt['timestamp'])
-        end
+    # version must be present unless creating
+    return nil unless create or not pt['version'].nil?
+    node.version = pt['version'].to_i
+
+    unless create
+      if pt['id'] != '0'
+        node.id = pt['id'].to_i
       end
+    end
 
-      tags = []
+    # visible if it says it is, or as the default if the attribute
+    # is missing.
+    node.visible = pt['visible'].nil? or pt['visible'] == 'true'
 
-      pt.find('tag').each do |tag|
-        tags << [tag['k'],tag['v']]
+    if create
+      node.timestamp = Time.now
+    else
+      if pt['timestamp']
+        node.timestamp = Time.parse(pt['timestamp'])
       end
+    end
 
-      tags = tags.collect { |k,v| "#{k}=#{v}" }.join(';')
-      tags = '' if tags.nil?
-
-      node.tags = tags
+    tags = []
 
+    pt.find('tag').each do |tag|
+      node.add_tag_key_val(tag['k'],tag['v'])
     end
+
     return node
   end
 
-  def save_with_history
-    begin
-      Node.transaction do
-        self.save
-        old_node = OldNode.from_node(self)
-        old_node.save
+  def save_with_history!
+    t = Time.now
+    Node.transaction do
+      self.version += 1
+      self.timestamp = t
+      self.save!
+
+      # Create a NodeTag
+      tags = self.tags
+      NodeTag.delete_all(['id = ?', self.id])
+      tags.each do |k,v|
+        tag = NodeTag.new
+        tag.k = k 
+        tag.v = v 
+        tag.id = self.id
+        tag.save!
+      end 
+
+      # Create an OldNode
+      old_node = OldNode.from_node(self)
+      old_node.timestamp = t
+      old_node.save_with_dependencies!
+    end
+  end
+
+  # Should probably be renamed delete_from to come in line with update
+  def delete_with_history!(new_node, user)
+    if self.visible
+      check_consistency(self, new_node, user)
+      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 ])
+        raise OSM::APIPreconditionFailedError.new
+      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])
+        raise OSM::APIPreconditionFailedError.new
+      else
+        self.changeset_id = new_node.changeset_id
+        self.visible = 0
+        save_with_history!
       end
-      return true
-    rescue Exception => ex
-      return nil
+    else
+      raise OSM::APIAlreadyDeletedError.new
     end
   end
 
+  def update_from(new_node, user)
+    check_consistency(self, new_node, user)
+
+    # FIXME logic needs to be double checked
+    self.changeset_id = new_node.changeset_id
+    self.latitude = new_node.latitude 
+    self.longitude = new_node.longitude
+    self.tags = new_node.tags
+    self.visible = true
+    save_with_history!
+  end
+  
+  def create_with_history(user)
+    check_create_consistency(self, user)
+    self.version = 0
+    self.visible = true
+    save_with_history!
+  end
+
   def to_xml
-    doc = XML::Document.new
-    doc.encoding = 'UTF-8' 
-    root = XML::Node.new 'osm'
-    root['version'] = API_VERSION
-    root['generator'] = 'OpenStreetMap server'
-    doc.root = root
-    root << to_xml_node()
+    doc = OSM::API.new.get_xml_doc
+    doc.root << to_xml_node()
     return doc
   end
 
-  def to_xml_node
+  def to_xml_node(user_display_name_cache = nil)
     el1 = XML::Node.new 'node'
     el1['id'] = self.id.to_s
-    el1['lat'] = self.latitude.to_s
-    el1['lon'] = self.longitude.to_s
-    Node.split_tags(el1, self.tags)
+    el1['lat'] = self.lat.to_s
+    el1['lon'] = self.lon.to_s
+    el1['version'] = self.version.to_s
+    el1['changeset'] = self.changeset_id.to_s
+    
+    user_display_name_cache = {} if user_display_name_cache.nil?
+
+    if user_display_name_cache and user_display_name_cache.key?(self.changeset.user_id)
+      # use the cache if available
+    elsif self.changeset.user.data_public?
+      user_display_name_cache[self.changeset.user_id] = self.changeset.user.display_name
+    else
+      user_display_name_cache[self.changeset.user_id] = nil
+    end
+
+    el1['user'] = user_display_name_cache[self.changeset.user_id] unless user_display_name_cache[self.changeset.user_id].nil?
+
+    self.tags.each 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
 
-  def self.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
+  def tags_as_hash
+    return tags
+  end
+
+  def tags
+    unless @tags
+      @tags = {}
+      self.node_tags.each do |tag|
+        @tags[tag.k] = tag.v
       end
     end
+    @tags
   end
+
+  def tags=(t)
+    @tags = t 
+  end 
+
+  def add_tag_key_val(k,v)
+    @tags = Hash.new unless @tags
+
+    # duplicate tags are now forbidden, so we can't allow values
+    # in the hash to be overwritten.
+    raise OSM::APIDuplicateTagsError.new if @tags.include? k
+
+    @tags[k] = v
+  end
+
+  ##
+  # dummy method to make the interfaces of node, way and relation
+  # more consistent.
+  def fix_placeholders!(id_map)
+    # nodes don't refer to anything, so there is nothing to do here
+  end
+
 end