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[rails.git] / lib / diff_reader.rb

diff --git a/lib/diff_reader.rb b/lib/diff_reader.rb
index 37de8ea59f043822bff8faa353b88bef2e5ec3bf..0b159315830e25a6eb6c56c98c2295fbcac3ee36 100644 (file)
--- a/lib/diff_reader.rb
+++ b/lib/diff_reader.rb
@@ -18,7 +18,7 @@ class DiffReader
   # in OsmChange format. All diffs must be limited to a single changeset
   # given in +changeset+.
   def initialize(data, changeset)
-    @reader = XML::Reader.new data
+    @reader = XML::Reader.string(data)
     @changeset = changeset
   end
 
@@ -26,11 +26,12 @@ class DiffReader
   # Reads the next element from the XML document. Checks the return value
   # and throws an exception if an error occurred.
   def read_or_die
-    # NOTE: XML::Reader#read returns 0 for EOF and -1 for error.
-    # we allow an EOF because we are expecting this to always happen
-    # at the end of a document.
-    if @reader.read < 0
-      raise APIBadUserInput.new("Unexpected end of XML document.")
+    # NOTE: XML::Reader#read returns false for EOF and raises an
+    # exception if an error occurs.
+    begin
+      @reader.read
+    rescue LibXML::XML::Error => ex
+      raise OSM::APIBadXMLError.new("changeset", xml, ex.message)
     end
   end
 
@@ -71,8 +72,8 @@ class DiffReader
   def with_model
     with_element do |model_name|
       model = MODELS[model_name]
-      raise "Unexpected element type #{model_name}, " +
-        "expected node, way, relation." if model.nil?
+      raise OSM::APIBadUserInput.new("Unexpected element type #{model_name}, " +
+                                     "expected node, way or relation.") if model.nil?
       yield model, @reader.expand
       @reader.next
     end
@@ -129,7 +130,7 @@ class DiffReader
 
           # some elements may have placeholders for other elements in the
           # diff, so we must fix these before saving the element.
-          new.fix_placeholders!(ids)
+          new.fix_placeholders!(ids, placeholder_id)
 
           # create element given user
           new.create_with_history(@changeset.user)
@@ -155,19 +156,21 @@ class DiffReader
 
           # if the ID is a placeholder then map it to the real ID
           model_sym = model.to_s.downcase.to_sym
-          is_placeholder = ids[model_sym].include? new.id
-          id = is_placeholder ? ids[model_sym][new.id] : new.id
+          client_id = new.id
+          is_placeholder = ids[model_sym].include? client_id
+          id = is_placeholder ? ids[model_sym][client_id] : client_id
 
           # and the old one from the database
           old = model.find(id)
 
+          # translate any placeholder IDs to their true IDs.
           new.fix_placeholders!(ids)
+          new.id = id
+
           old.update_from(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["old_id"] = client_id.to_s
           xml_result["new_id"] = id.to_s 
           # version is updated in "old" through the update, so we must not
           # return new.version here but old.version!