Add support for conditional deletes in changeset uploads

[rails.git] / lib / diff_reader.rb

diff --git a/lib/diff_reader.rb b/lib/diff_reader.rb
index 0b159315830e25a6eb6c56c98c2295fbcac3ee36..0f0492f444f57d781bf9ec21dcf4b90d7ac8ac59 100644 (file)
--- a/lib/diff_reader.rb
+++ b/lib/diff_reader.rb
@@ -54,7 +54,18 @@ class DiffReader
         # as the call to @reader.next in the innermost loop will take
         # care of that for us.
         if @reader.node_type == 1 # element
         # as the call to @reader.next in the innermost loop will take
         # care of that for us.
         if @reader.node_type == 1 # element

-          yield @reader.name
+          name = @reader.name
+          attributes =  {}
+
+          if @reader.has_attributes?
+            while @reader.move_to_next_attribute == 1
+              attributes[@reader.name] = @reader.value
+            end
+
+            @reader.move_to_element
+          end
+
+          yield name, attributes

         else
           read_or_die
         end
         else
           read_or_die
         end


@@ -70,7 +81,7 @@ class DiffReader
   # elements, it would be better to DRY and do this in a block. This
   # could also help with error handling...?
   def with_model
   # elements, it would be better to DRY and do this in a block. This
   # could also help with error handling...?
   def with_model

-    with_element do |model_name|
+    with_element do |model_name,model_attributes|

       model = MODELS[model_name]
       raise OSM::APIBadUserInput.new("Unexpected element type #{model_name}, " +
                                      "expected node, way or relation.") if model.nil?
       model = MODELS[model_name]
       raise OSM::APIBadUserInput.new("Unexpected element type #{model_name}, " +
                                      "expected node, way or relation.") if model.nil?


@@ -104,13 +115,13 @@ class DiffReader
 
     # take the first element and check that it is an osmChange element
     @reader.read
 
     # take the first element and check that it is an osmChange element
     @reader.read

-    raise APIBadUserInput.new("Document element should be 'osmChange'.") if @reader.name != 'osmChange'
+    raise OSM::APIBadUserInput.new("Document element should be 'osmChange'.") if @reader.name != 'osmChange'

 
     result = OSM::API.new.get_xml_doc
     result.root.name = "diffResult"
 
     # loop at the top level, within the <osmChange> element
 
     result = OSM::API.new.get_xml_doc
     result.root.name = "diffResult"
 
     # loop at the top level, within the <osmChange> element

-    with_element do |action_name|
+    with_element do |action_name,action_attributes|

       if action_name == 'create'
         # create a new element. this code is agnostic of the element type
         # because all the elements support the methods that we're using.
       if action_name == 'create'
         # create a new element. this code is agnostic of the element type
         # because all the elements support the methods that we're using.


@@ -185,7 +196,7 @@ class DiffReader
           # delete doesn't have to contain a full payload, according to
           # the wiki docs, so we just extract the things we need.
           new_id = xml['id'].to_i
           # delete doesn't have to contain a full payload, according to
           # the wiki docs, so we just extract the things we need.
           new_id = xml['id'].to_i

-          raise API::APIBadXMLError.new(model, xml, "ID attribute is required") if new_id.nil?
+          raise OSM::APIBadXMLError.new(model, xml, "ID attribute is required") if new_id.nil?

 
           # if the ID is a placeholder then map it to the real ID
           model_sym = model.to_s.downcase.to_sym
 
           # if the ID is a placeholder then map it to the real ID
           model_sym = model.to_s.downcase.to_sym


@@ -204,12 +215,23 @@ class DiffReader
           # can a delete have placeholders under any circumstances?
           # if a way is modified, then deleted is that a valid diff?
           new.fix_placeholders!(ids)
           # can a delete have placeholders under any circumstances?
           # if a way is modified, then deleted is that a valid diff?
           new.fix_placeholders!(ids)

-          old.delete_with_history!(new, @changeset.user)

 
           xml_result = XML::Node.new model.to_s.downcase
           # oh, the irony... the "new" element actually contains the "old" ID
           # a better name would have been client/server, but anyway...
           xml_result["old_id"] = new_id.to_s
 
           xml_result = XML::Node.new model.to_s.downcase
           # oh, the irony... the "new" element actually contains the "old" ID
           # a better name would have been client/server, but anyway...
           xml_result["old_id"] = new_id.to_s

+
+          if action_attributes["if-unused"]
+            begin
+              old.delete_with_history!(new, @changeset.user)
+            rescue OSM::APIPreconditionFailedError => ex
+              xml_result["new_id"] = old.id.to_s
+              xml_result["new_version"] = old.version.to_s
+            end
+          else
+            old.delete_with_history!(new, @changeset.user)
+          end
+

           result.root << xml_result
         end
 
           result.root << xml_result
         end