[OC-3564] move core Chef to the repo root \o/ \m/

The opscode/chef repository now only contains the core Chef library code
used by chef-client, knife and chef-solo!

1 files changed, 124 insertions, 0 deletions

diff --git a/lib/chef/resource_collection/stepable_iterator.rb b/lib/chef/resource_collection/stepable_iterator.rb
new file mode 100644
index 0000000000..ec1e244758
--- /dev/null
+++ b/lib/chef/resource_collection/stepable_iterator.rb
@@ -0,0 +1,124 @@
+# Author:: Daniel DeLeo (<dan@kallistec.com>)
+# Copyright:: Copyright (c) 2009 Daniel DeLeo
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+class Chef
+  class ResourceCollection
+    class StepableIterator
+      
+      def self.for_collection(new_collection)
+        instance = new(new_collection)
+        instance
+      end
+      
+      attr_accessor :collection
+      attr_reader :position
+      
+      def initialize(collection=[])
+        @position = 0
+        @paused = false
+        @collection = collection
+      end
+      
+      def size
+        collection.size
+      end
+      
+      def each(&block)
+        reset_iteration(block)
+        @iterator_type = :element
+        iterate
+      end
+      
+      def each_index(&block)
+        reset_iteration(block)
+        @iterator_type = :index
+        iterate
+      end
+      
+      def each_with_index(&block)
+        reset_iteration(block)
+        @iterator_type = :element_with_index
+        iterate
+      end
+      
+      def paused?
+        @paused
+      end
+      
+      def pause
+        @paused = true
+      end
+      
+      def resume
+        @paused = false
+        iterate
+      end
+      
+      def rewind
+        @position = 0
+      end
+      
+      def skip_back(skips=1)
+        @position -= skips
+      end
+      
+      def skip_forward(skips=1)
+        @position += skips
+      end
+      
+      def step
+        return nil if @position == size
+        call_iterator_block
+        @position += 1
+      end
+      
+      def iterate_on(iteration_type, &block)
+        @iterator_type = iteration_type
+        @iterator_block = block
+      end
+      
+      private
+      
+      def reset_iteration(iterator_block)
+        @iterator_block = iterator_block
+        @position = 0
+        @paused = false
+      end
+      
+      def iterate
+        while @position < size && !paused?
+          step
+        end
+        collection
+      end
+      
+      def call_iterator_block
+        case @iterator_type
+        when :element
+          @iterator_block.call(collection[@position])
+        when :index
+          @iterator_block.call(@position)
+        when :element_with_index
+          @iterator_block.call(collection[@position], @position)
+        else
+          raise "42error: someone forgot to set @iterator_type, wtf?"
+        end
+      end
+      
+    end
+  end
+end