# Uses the streaming LibXML "Reader" interface to cut down on memory
# usage, so hopefully we can process fairly large diffs.
class DiffReader
- include ConsistencyValidations
-
# maps each element type to the model class which handles it
MODELS = {
"node" => Node,
model = MODELS[model_name]
if model.nil?
raise OSM::APIBadUserInput, "Unexpected element type #{model_name}, " \
- "expected node, way or relation."
+ "expected node, way or relation."
end
# new in libxml-ruby >= 2, expand returns an element not associated
# with a document. this means that there's no encoding parameter,
@reader.read
raise OSM::APIBadUserInput, "Document element should be 'osmChange'." if @reader.name != "osmChange"
- result = OSM::API.new.get_xml_doc
+ result = OSM::API.new.xml_doc
result.root.name = "diffResult"
# loop at the top level, within the <osmChange> element
with_element do |action_name, action_attributes|
- if action_name == "create"
+ case action_name
+ when "create"
# create a new element. this code is agnostic of the element type
# because all the elements support the methods that we're using.
with_model do |model, xml|
- new = model.from_xml_node(xml, true)
+ new = model.from_xml_node(xml, :create => true)
check(model, xml, new)
# when this element is saved it will get a new ID, so we save it
result.root << xml_result
end
- elsif action_name == "modify"
+ when "modify"
# modify an existing element. again, this code doesn't directly deal
# with types, but uses duck typing to handle them transparently.
with_model do |model, xml|
# get the new element from the XML payload
- new = model.from_xml_node(xml, false)
+ new = model.from_xml_node(xml, :create => false)
check(model, xml, new)
# if the ID is a placeholder then map it to the real ID
result.root << xml_result
end
- elsif action_name == "delete"
+ when "delete"
# delete action. this takes a payload in API 0.6, so we need to do
# most of the same checks that are done for the modify.
with_model do |model, xml|