recent changes

git-svn-id: https://dev.finn.de/svn/cockpit/branches/reporting_merge@1131 7926756e-e54e-46e6-9721-ed318f58905e

app/models/cost_query/walker.rb

@@ -4,8 +4,8 @@ class CostQuery::Walker
 
   def initialize(query)
     @query = query
-  end
 
+  end
   ##
   # @return [CostQuery::Result::Base] Result tree with row group bys at the top
   # @see CostQuery::Chainable#result
@@ -44,7 +44,21 @@ class CostQuery::Walker
     columns + rows
   end
 
-  def walk
-    raise NotImplementedError, "done"
+  ##
+  # @example
+  #   query.walk(:column_first) do |current, subgregation|
+  #     if subgregation.nil?
+  #       ["<td>#{current.count}</td>"]
+  #     elsif current.type == :column
+  #       subgregation.first.unshift "<td rowspan='#{subgregation.size}'>#{current.group_fields}</td>"
+  #     else
+  #       subgregation.flatten
+  #     end
+  #   end
+  def walk(result = nil, &block)
+    result ||= row_first
+    result = send result if result.is_a? Symbol
+    return block.call(result, nil) unless result.has_children?
+    block.call result, result.map { |r| walk(r, &block) }
   end
 end