X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/1a6230fb25f44491156dd20b07a4bfd8a86cca56..9f64b0848f01fb849849380ff32756228a35eca6:/app/models/node.rb

diff --git a/app/models/node.rb b/app/models/node.rb
index 5a8e03ef1..faba4ed66 100644
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -1,28 +1,36 @@
-class Node < GeoRecord
+class Node < ActiveRecord::Base
   require 'xml/libxml'
 
+  include GeoRecord
+  include ConsistencyValidations
+
   set_table_name 'current_nodes'
-  
-  validates_presence_of :user_id, :timestamp
+
+  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
+
   has_many :way_nodes
+  has_many :ways, :through => :way_nodes
+
   has_many :node_tags, :foreign_key => :id
-  belongs_to :user
- 
+  
+  has_many :old_way_nodes
+  has_many :ways_via_history, :class_name=> "Way", :through => :old_way_nodes, :source => :way
+
+  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
+
+  # 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
 
-  def in_world?
-    return false if self.lat < -90 or self.lat > 90
-    return false if self.lon < -180 or self.lon > 180
-    return true
-  end
-
   #
   # Search for nodes matching tags within bounding_box
   #
@@ -45,7 +53,7 @@ class Node < GeoRecord
     #conditions = keys.join(' AND ')
  
     find_by_area(min_lat, min_lon, max_lat, max_lon,
-                    :conditions => 'visible = 1',
+                    :conditions => {:visible => true},
                     :limit => APP_CONFIG['max_number_of_nodes']+1)  
   end
 
@@ -55,76 +63,139 @@ class Node < GeoRecord
       p = XML::Parser.new
       p.string = xml
       doc = p.parse
-  
-      node = Node.new
 
       doc.find('//osm/node').each do |pt|
-        node.lat = pt['lat'].to_f
-        node.lon = pt['lon'].to_f
-
-        return nil unless node.in_world?
+        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
-        end
+    # version must be present unless creating
+    return nil unless create or not pt['version'].nil?
+    node.version = create ? 0 : pt['version'].to_i
 
-        tags = []
+    unless create
+      if pt['id'] != '0'
+        node.id = pt['id'].to_i
+      end
+    end
 
-        pt.find('tag').each do |tag|
-          node.add_tag_key_val(tag['k'],tag['v'])
-        end
+    # visible if it says it is, or as the default if the attribute
+    # is missing.
+    node.visible = pt['visible'].nil? or pt['visible'] == 'true'
 
+    if create
+      node.timestamp = Time.now
+    else
+      if pt['timestamp']
+        node.timestamp = Time.parse(pt['timestamp'])
       end
-    rescue
-      node = nil
+    end
+
+    tags = []
+
+    pt.find('tag').each do |tag|
+      node.add_tag_key_val(tag['k'],tag['v'])
     end
 
     return node
   end
 
+  ##
+  # the bounding box around a node
+  def bbox
+    [ longitude, latitude, longitude, latitude ]
+  end
+
   def save_with_history!
     t = Time.now
-
-    Node.transaction do 
-      # apply timestamp to the new node
+    Node.transaction do
+      self.version += 1
       self.timestamp = t
       self.save!
-    end
 
-    # Create a NodeTag
-    NodeTag.transaction do 
+      # Create a NodeTag
       tags = self.tags
-
       NodeTag.delete_all(['id = ?', self.id])
-
-      sequence_id = 1
       tags.each do |k,v|
         tag = NodeTag.new
         tag.k = k 
         tag.v = v 
         tag.id = self.id
-        tag.sequence_id = sequence_id
         tag.save!
-        sequence_id += 1
       end 
-    end 
-    # Create an OldNode
-    old_node = OldNode.from_node(self)
-    old_node.timestamp = t
-    old_node.save_with_dependencies!
 
+      # Create an OldNode
+      old_node = OldNode.from_node(self)
+      old_node.timestamp = t
+      old_node.save_with_dependencies!
+
+      # save the changeset in case of bounding box updates
+      changeset.save!
+    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 = ? AND current_way_nodes.node_id = ?", true, 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 = ? AND member_type='node' and member_id=? ", true, self.id])
+        raise OSM::APIPreconditionFailedError.new
+      else
+        self.changeset_id = new_node.changeset_id
+        self.visible = false
+
+        # update the changeset with the deleted position
+        changeset.update_bbox!(bbox)
+
+        save_with_history!
+      end
+    else
+      raise OSM::APIAlreadyDeletedError.new
+    end
+  end
+
+  def update_from(new_node, user)
+    check_consistency(self, new_node, user)
+
+    # update changeset with *old* position first
+    changeset.update_bbox!(bbox);
+
+    # 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
+
+    # update changeset with *new* position
+    changeset.update_bbox!(bbox);
+
+    save_with_history!
+  end
+  
+  def create_with_history(user)
+    check_create_consistency(self, user)
+    self.version = 0
+    self.visible = true
+
+    # update the changeset to include the new location
+    changeset.update_bbox!(bbox)
+
+    save_with_history!
   end
 
   def to_xml
@@ -138,18 +209,23 @@ class Node < GeoRecord
     el1['id'] = self.id.to_s
     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.user_id)
+    if user_display_name_cache and user_display_name_cache.key?(self.changeset.user_id)
       # use the cache if available
-    elsif self.user.data_public?
-      user_display_name_cache[self.user_id] = self.user.display_name
+    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.user_id] = nil
+      user_display_name_cache[self.changeset.user_id] = nil
     end
 
-    el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil?
+    if not user_display_name_cache[self.changeset.user_id].nil?
+      el1['user'] = user_display_name_cache[self.changeset.user_id]
+      el1['uid'] = self.changeset.user_id.to_s
+    end
 
     self.tags.each do |k,v|
       el2 = XML::Node.new('tag')
@@ -164,11 +240,7 @@ class Node < GeoRecord
   end
 
   def tags_as_hash
-    hash = {}
-    Tags.split(self.tags) do |k,v|
-      hash[k] = v
-    end
-    hash
+    return tags
   end
 
   def tags
@@ -187,9 +259,26 @@ class Node < GeoRecord
 
   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
 
+  ##
+  # are the preconditions OK? this is mainly here to keep the duck
+  # typing interface the same between nodes, ways and relations.
+  def preconditions_ok?
+    in_world?
+  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