WIP

2 files changed, 94 insertions, 0 deletions

diff --git a/lib/chef/decorator/lazy.rb b/lib/chef/decorator/lazy.rb
new file mode 100644
index 0000000000..067d6bd7f8
--- /dev/null
+++ b/lib/chef/decorator/lazy.rb
@@ -0,0 +1,50 @@
+#--
+# Copyright:: Copyright 2016 Chef Software, Inc.
+# 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.
+#
+
+require "chef/decorator"
+
+class Chef
+  class Decorator
+    # Lazy wrapper to delay construction of an object until a method is
+    # called against the object.
+    #
+    # @example
+    #   a = Chef::Decorator::Lazy.new { puts "allocated" }
+    #   puts "start"
+    #   puts a.class
+    #
+    #   outputs:
+    #
+    #   start
+    #   allocated
+    #   String
+    #
+    # @since 12.10.x
+    class Lazy < Decorator
+      def initialize(&block)
+        super
+        @block = block
+      end
+
+      def __getobj__
+        __setobj__(@block.call) unless defined?(@delegate_sd_obj)
+        super
+      end
+
+    end
+  end
+end
diff --git a/lib/chef/decorator/lazy_array.rb b/lib/chef/decorator/lazy_array.rb
new file mode 100644
index 0000000000..3879aea5f6
--- /dev/null
+++ b/lib/chef/decorator/lazy_array.rb
@@ -0,0 +1,44 @@
+#--
+# Copyright:: Copyright 2016 Chef Software, Inc.
+# 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.
+#
+
+require "chef/decorator"
+
+class Chef
+  class Decorator
+    # Lazy wrapper to delay construction of an object until a method is
+    # called against the object.
+    #
+    # @example
+    #   a = Chef::Decorator::Lazy.new { puts "allocated" }
+    #   puts "start"
+    #   puts a.class
+    #
+    #   outputs:
+    #
+    #   start
+    #   allocated
+    #   String
+    #
+    # @since 12.10.x
+    class LazyArray < Lazy
+      def [](idx)
+        block = @block
+        Lazy.new { block.call[idx] }
+      end
+    end
+  end
+end