X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/d9e070e06956801aba2378c1b79b4d9f13ae12ee..2a20c57a8e642c1117be2a608faaa91597b25726:/app/models/changeset.rb

diff --git a/app/models/changeset.rb b/app/models/changeset.rb
index c9eeb0018..b00dfa8af 100644
--- a/app/models/changeset.rb
+++ b/app/models/changeset.rb
@@ -4,6 +4,26 @@ class Changeset < ActiveRecord::Base
   belongs_to :user
 
   has_many :changeset_tags, :foreign_key => 'id'
+  
+  has_many :nodes
+  has_many :ways
+  has_many :relations
+  has_many :old_nodes
+  has_many :old_ways
+  has_many :old_relations
+  
+  validates_presence_of :user_id, :created_at
+  validates_inclusion_of :open, :in => [ true, false ]
+  
+  # over-expansion factor to use when updating the bounding box
+  EXPAND = 0.1
+
+  # Use a method like this, so that we can easily change how we
+  # determine whether a changeset is open, without breaking code in at 
+  # least 6 controllers
+  def is_open?
+    return open
+  end
 
   def self.from_xml(xml, create=false)
     begin
@@ -23,13 +43,45 @@ class Changeset < ActiveRecord::Base
         end
       end
     rescue Exception => ex
-    print "noes "+ ex.to_s + "\n"
       cs = nil
     end
 
     return cs
   end
 
+  ##
+  # returns the bounding box of the changeset. it is possible that some
+  # or all of the values will be nil, indicating that they are undefined.
+  def bbox
+    @bbox ||= [ min_lon, min_lat, max_lon, max_lat ]
+  end
+
+  ##
+  # expand the bounding box to include the given bounding box. also, 
+  # expand a little bit more in the direction of the expansion, so that
+  # further expansions may be unnecessary. this is an optimisation 
+  # suggested on the wiki page by kleptog.
+  def update_bbox!(array)
+    # ensure that bbox is cached and has no nils in it. if there are any
+    # nils, just use the bounding box update to write over them.
+    @bbox = bbox.zip(array).collect { |a, b| a.nil? ? b : a }
+
+    # FIXME - this looks nasty and violates DRY... is there any prettier 
+    # way to do this? 
+    @bbox[0] = array[0] + EXPAND * (@bbox[0] - @bbox[2]) if array[0] < @bbox[0]
+    @bbox[1] = array[1] + EXPAND * (@bbox[1] - @bbox[3]) if array[1] < @bbox[1]
+    @bbox[2] = array[2] + EXPAND * (@bbox[2] - @bbox[0]) if array[2] > @bbox[2]
+    @bbox[3] = array[3] + EXPAND * (@bbox[3] - @bbox[1]) if array[3] > @bbox[3]
+
+    # update active record. rails 2.1's dirty handling should take care of
+    # whether this object needs saving or not.
+    self.min_lon, self.min_lat, self.max_lon, self.max_lat = @bbox
+  end
+
+  def tags_as_hash
+    return tags
+  end
+
   def tags
     unless @tags
       @tags = {}
@@ -54,6 +106,7 @@ class Changeset < ActiveRecord::Base
 
     Changeset.transaction do
       # fixme update modified_at time?
+      # FIXME there is no modified_at time, should it be added
       self.save!
     end
 
@@ -76,6 +129,7 @@ class Changeset < ActiveRecord::Base
     doc.root << to_xml_node()
     return doc
   end
+  
   def to_xml_node(user_display_name_cache = nil)
     el1 = XML::Node.new 'changeset'
     el1['id'] = self.id.to_s
@@ -102,9 +156,14 @@ class Changeset < ActiveRecord::Base
     el1['created_at'] = self.created_at.xmlschema
     el1['open'] = self.open.to_s
 
-    # FIXME FIXME FIXME: This does not include changes yet! There is 
-    # currently no changeset_id column in the tables as far as I can tell,
-    # so this is just a scaffold to build on, not a complete to_xml
+    el1['min_lon'] = (bbox[0] / SCALE).to_s unless bbox[0].nil?
+    el1['min_lat'] = (bbox[1] / SCALE).to_s unless bbox[1].nil?
+    el1['max_lon'] = (bbox[2] / SCALE).to_s unless bbox[2].nil?
+    el1['max_lat'] = (bbox[3] / SCALE).to_s unless bbox[3].nil?
+    
+    # NOTE: changesets don't include the XML of the changes within them,
+    # they are just structures for tagging. to get the osmChange of a
+    # changeset, see the download method of the controller.
 
     return el1
   end