From 9018c506736711ac2e1fa82577d3a3344a2e789d Mon Sep 17 00:00:00 2001
From: rkh <rkh@7926756e-e54e-46e6-9721-ed318f58905e>
Date: Thu, 27 May 2010 08:47:25 +0000
Subject: [PATCH] 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 | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/app/models/cost_query/walker.rb b/app/models/cost_query/walker.rb
index 1f8f522231..263f2217b3 100644
--- a/app/models/cost_query/walker.rb
+++ b/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